NS169 Telecommunications Installations

on Ausgrid HV Transmission Towers

September 2004

SUMMARY

Network Standard NS169 specifies the technical requirements for the attachment of telecommunications installations to high voltage steel transmission towers.

ISSUE

For issue to all Ausgrid and Accredited Service Providers’ staff:

involved in the review and approval of applications for the attachment of telecommunications installations to Ausgrid’s high voltage transmission towers; and

supervising or carrying out of works associated with those installations.

Operators of telecommunications installations: because those installations, when attached to Ausgrid’s high voltage steel transmission towers, must comply with this Standard.

Ausgrid maintains a copy of this and other Network Standards together with updates and amendments on www.ausgrid.com.au.

Where this standard is issued as a controlled document replacing an earlier edition, remove and destroy the superseded document.

DISCLAIMER

As Ausgrid’s standards are subject to ongoing review, the information contained in this document may be amended by Ausgrid at any time.

It is possible that conflict may exist between standard documents. In this event, the most recent standard shall prevail.

This document has been developed using information available from field and other sources and is suitable for most situations encountered in Ausgrid. Particular conditions, projects or localities may require special or different practices. It is the responsibility of the local manager, supervisor, assured quality contractor and the individuals involved to ensure that a safe system of work is employed and that statutory requirements are met.

Ausgrid disclaims any and all liability to any person or persons for any procedure, process or any other thing done or not done, as a result of this Standard.

Note that compliance with this Network Standard does not automatically satisfy the requirements of a Designer Safety Report. The designer must comply with the provisions of the WHS Regulation 2011 (NSW - Part 6.2 Duties of designer of structure and person who commissions construction work) which requires the designer to provide a written safety report to the person who commissioned the design. This report must be provided to Ausgrid in all instances, including where the design was commissioned by or on behalf of a person who proposes to connect premises to Ausgrid’s network, and will form part of the Designer Safety Report which must also be presented to Ausgrid. Further information is provided in Network Standard (NS) 212 Integrated Support Requirements for Ausgrid Network Assets.

INTERPRETATION

In the event that any user of this Standard considers that any of its provisions is uncertain, ambiguous or otherwise in need of interpretation, the user should request Ausgrid to clarify the provision. Ausgrid’s interpretation shall then apply as though it was included in the Standard, and is final and binding. No correspondence will be entered into with any person disputing the meaning of the provision published in the Standard or the accuracy of Ausgrid’s interpretation.

Network Standard NS169

Telecommunications Installations on Ausgrid HV Transmission Towers

September 2004

CONTENTS

1 SCOPE ........................................................................................................................ 1

2 DEFINITIONS .............................................................................................................. 1

3 RESPONSIBILITIES .................................................................................................... 3

4 TRAINING.................................................................................................................... 4 4.1 Routine Tower Maintenance (additional precautions) ..................................... 5

5 STRUCTURAL AND CIVIL .......................................................................................... 6 5.1 General............................................................................................................. 6 5.2 The Approval Process...................................................................................... 6

5.2.1 Preliminary Phase .................................................................................... 6 5.2.1.1 Structural Design Engineer ........................................................................... 7

5.2.2 Detailed Investigation/Design Phase........................................................ 7 5.2.2.1 Inspection ..................................................................................................... 7 5.2.2.2 Structural Design .......................................................................................... 8

5.2.3 Construction ............................................................................................. 9 5.3 Technical Structural and Civil Specification ..................................................... 9

5.3.1 Structural and Civil Works - General ........................................................ 9 5.3.2 Design Constraints ................................................................................. 11 5.3.3 Detailed Structural and Civil Design....................................................... 11

5.3.3.1 Extent of Work ............................................................................................ 11 5.3.3.2 Structural Checking and Design ................................................................. 11 5.3.3.3 Fabrication of HV Tower Members ............................................................. 16

5.3.4 Shoring of Excavations and Temporary Supports.................................. 17 5.3.5 Road Works............................................................................................ 17 5.3.6 OH&S Signs ........................................................................................... 17 5.3.7 Prevention of Access to HV Towers....................................................... 17

6 ELECTRICAL INSTALLATION .................................................................................. 18 6.1 General........................................................................................................... 18

6.1.1 Scope of Electrical Installation Work by First Telco ............................... 18 6.1.2 Scope of Co-location with other Telcos.................................................. 19 6.1.3 Installation of consumer mains by First Telco ........................................ 20 6.1.4 Meter Panel for Single Telecommunications Installation ....................... 20 6.1.5 Meter Panel for Co-location with another Telco ..................................... 20 6.1.6 Submains from the Meter Panel............................................................. 20 6.1.7 Installation of Submains from the Meter Panel ...................................... 21 6.1.8 Supply System Characteristics............................................................... 21 6.1.9 Isolation Panel ........................................................................................ 21 6.1.10 Generator Supply ................................................................................... 23 6.1.11 Isolation Transformer.............................................................................. 24 6.1.12 Protection and Control of Low Voltage Installation ................................ 24 6.1.13 Mains Supply Isolation............................................................................ 24 6.1.14 Battery Backup Supply Isolation............................................................. 24

6.2 Distribution Board........................................................................................... 25 6.3 Security System and Air Conditioning Control ............................................... 25 6.4 Safety And Lightning Protection Earthing System ......................................... 25 6.5 Cable Ladders External to Equipment Cabin................................................. 29 6.6 Testing and Commissioning........................................................................... 29 6.7 Underground Cable Markers.......................................................................... 30 6.8 Underground Services ................................................................................... 30 6.9 Telstra Conduit ............................................................................................... 30 6.10 Ausgrid Power Shutdown and Access Procedure ......................................... 30

6.10.1 Power Shutdown Procedure................................................................... 30

APPENDIX A - TYPICAL EQUIPMENT SCHEDULE........................................................... 31

APPENDIX B - TRAINING REQUIREMENTS...................................................................... 33

APPENDIX C - TYPICAL ACCESS PROTOCOL CONDITIONS ......................................... 35

1 September 2004

NS169

1 SCOPE

This Network Standard specifies the requirements for the attachment of telecommunications installations to high voltage steel transmission towers.

This Standard does not apply to telecommunications installations on Ausgrid’s communications towers or other network assets, or to the erection of monopoles on Ausgrid property (refer to other relevant Network Standards).

2 DEFINITIONS

Attendance Register Register provided and maintained by Telco of HV tower to record names of all persons attending site for work aloft or in communications hut.

Commissioning checksheet

Document to be completed by the Tower Works Co-ordinator confirming that all works have been completed in accordance with Ausgrid’s Network Standards and approved drawings.

Exclusion zone Area surrounding antennae where the radiation level may exceed the limits set for non-occupational exposure as defined in Interim Australian Standard 2772.1: 1998: Radiofrequency fields – Maximum exposure levels - 3 kHz to 300 GHz.

First Telco Is the first Telco in relation to a particular HV tower to install a telecommunications installation at that tower.

HV tower Steel tower owned and operated by Ausgrid to transmit electricity at high voltages (between 11,000 and 132,000 volts).

Network Facilities Access Officer

The officer appointed by a party to handle all of that party’s negotiations for access to HV towers and related matters (ie, Ausgrid and Telco each appoint their own officer).

Project Manager Person nominated by the Telco to be responsible for all works associated with the installation of telecommunications installations on or in close proximity to HV towers.

Telco Operator of telecommunications installations, including carriers and carriage service providers as defined in Commonwealth telecommunications legislation.

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telecommunications installation

A telecommunications installation generally includes one or more antenna fixed to an HV tower, strengthening works to the HV tower (if required), meter panel, Equipment Cabin, underground submains run from the meter panel to the Equipment Cabin, Isolating Panel, distribution board and associated submains, all necessary cabling, sub-circuits and cable trays, an earthing system and may include, as part of the Equipment Cabin, air-conditioning, a battery backup unit and a portable generator unit. (Note: Isolating Panel supplied and installed by First Telco and all works on or to HV towers carried out by Ausgrid as a contractor to Telco).

Tower Works Co-ordinator

The Ausgrid person who has the responsibility to check that all works associated with the installation of telecommunications installations on, or in close proximity to, HV towers are completed in accordance relevant Network Standards and approved drawings.

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3 RESPONSIBILITIES

Ausgrid’s Network Subsidiary:

receives and processes all proposals for attachments to HV towers

arranges for the Telco to receive copies of relevant technical information

co-ordinates all technical comments on such proposals

negotiates commercial agreements for the attachment of telecommunications installations to HV towers.

The Network Facilities Access Officer is a party’s principal contact for all inquiries and negotiations related to the installation of telecommunications installations on HV towers. (Note: Ausgrid and Telco each appoint their own Network Facilities Access Officer.)

Ausgrid’s Enerserve Subsidiary must negotiate with each Telco a separate maintenance agreement for the inspection and maintenance of the Telco’s telecommunications installations on HV towers. They will also collect and provide copies of all technical documentation and drawings applicable to a HV Tower on which a Telco proposes to attach a telecommunications installation.

Ausgrid’s Customer Supply Subsidiary shall arrange for processing of applications for connection of supply to telecommunications installations on HV towers in accordance with the requirements of this Network Standard

The Tower Works Co-ordinator (nominated by Ausgrid):

ensures all necessary training is completed by all persons working near HV towers

is authorised to stop work on a project if works are unsatisfactory

provides on site auditing of works carried out on or adjacent to HV towers

checks that all works are in accordance with this Standard and other relevant Network Standards and approved drawings

advises the Project Manager of any non-conformances.

The Project Manager (nominated by Telco):

is the principal contact for all inquiries or orders related to the installation of telecommunications installations on HV towers

has all necessary authority to authorise on site changes to the works as and when required by Ausgrid.

Antennae may not be energised (including for testing) until the Tower Works Co-ordinator has completed the Commissioning checksheet and given written approval to the Telco.

After the works commence all inquiries must be referred to the Tower Works Co-ordinator.

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4 TRAINING

Because of the special conditions applying to work in the vicinity of HV towers, and the need to ensure the safety of staff working aloft on HV towers where telecommunications installations are installed, special training is required for all persons undertaking such works.

Minimum Ausgrid provided training required for Contractors and Telco personnel working in the vicinity of HV towers shall be:

Training Frequency Provider

Site Induction1

Prior to commencement or where changed conditions require additional induction

Ausgrid

Electrical Safety Rules Relevant sections of the Ausgrid Electricity Safety Rules on commencement and with annual refresher #

Ausgrid

Local site conditions may require additional training. This shall be identified when a particular site is selected, and training nominated at that time by the Tower Works Co-ordinator.

For work on HV towers located inside a substation, the following additional training will be required.

Training Frequency Provider

Substation Access (including Ausgrid's Electrical Safety Rules)*

Prior to commencement Ausgrid

CPR Refresher Annual refresher # Accredited provider

LV Release and Rescue Refresher

Annual refresher # Ausgrid

*CPR is normally included with, but may be provided separately to Substation Access

# Refresher training must be current for work on HV Towers.

1 See Appendix B for details of training

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Ausgrid lineworkers working on the erection, commissioning and maintenance of telecommunications installations on HV towers shall be required to complete the following training.

Training Frequency Provider

Isolation procedures for de-energising telecommunications installations

Prior to first time working on tower telecommunications installations and an annual refresher. Information on changes to be circulated as they occur.

Initial by Telco, refreshers by Ausgrid 2

Use of radiation detectors (Detectors and training provided by Telco for duration of adjustment work)2

Only when a Lineworker is required to adjust position of dish antennae for line of site links or when detector equipment is changed – prior to commencing work.

Telco

Lineworkers, support staff or Ausgrid contractors (eg tower painters) who may be required to climb HV towers for Ausgrid work or rescue, shall be required to complete the following training.

Training Frequency Provider

Tower Comms Awareness Refresher

Annually or prior to commencement of contract

Ausgrid

4.1 Routine Tower Maintenance (additional precautions) All antennae are to be turned off for any maintenance or other work aloft on the HV tower. Any work on the antennae shall also only be carried out with the antennae turned off. If more than one Telco has a telecommunications installation on the HV tower, then antennae belonging to all Telcos shall be turned off for any such work. The de-energisation procedure shall be followed prior to climbing, and all staff attending the site shall sign the Attendance register prior to work commencing.

The relevant Telco’s Network Management Centre(s) (NMC) shall be advised by telephone on their 24 hour contact number, not less than 24 hours before requiring above ground access to the tower [ie in the vicinity of the antennae], except in the case of emergency. In the case of emergency, the Telco shall be advised as soon as possible. Access to the HV tower at ground level, eg for inspection of the tower foundation or earthing, does not require notification.

The NMC will be advised of the proposed date and duration of the planned access.

Ausgrid shall ensure that staff involved in high pressure washing of insulators are aware of the need to avoid spraying antennae, due to the risk of pushing them out of alignment.

2 See Appendix B for details of training

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5 STRUCTURAL AND CIVIL

5.1 General This section specifies Ausgrid’s minimum structural and construction requirements that Telcos and other parties must comply with when attaching telecommunications installations to HV towers. These installations must be designed and constructed to ensure the structural adequacy and lifetime performance of HV towers, related access tracks and the local environment.

If any standard practice, code, standard or requirement of an authority is more stringent than, or inconsistent with, this Standard, then an interpretation must be sought from Ausgrid immediately.

Unless the following requirement is waived in writing by Ausgrid before work commences on an installation, the Telco must, as a minimum, carry out all works regarding a telecommunications installation under this Standard as if it is a “low-impact facility” under the Telecommunications (Low-impact Facilities) Determination 1997, as updated from time to time.

Telcos must:

(a) supply to Ausgrid the information specified under section 4.2 of this Standard

(b) do all things necessary to obtain Ausgrid’s approval to commence installation work in accordance with this Standard

(c) check the ability of HV towers and their foundations to support the additional load of telecommunications installations

(d) if required, strengthen HV towers and their foundations*

(e) supply and install their proposed telecommunications installation* in accordance with this Standard

(f) maintain, upgrade or create access tracks to HV towers for construction purposes

(g) make good any environmental damage resulting from construction activities.

*Note: All work on HV towers and their foundations must be carried out by Ausgrid as Telco’s contractor.

5.2 The Approval Process To better manage the approval process, it is broken into the following phases:

Preliminary Phase

Detailed Investigation and Design Phase

Construction Phase.

5.2.1 Preliminary Phase On receipt of the Telco’s initial enquiry about attaching a telecommunications installation to an HV tower, Ausgrid will undertake preliminary investigations to ascertain:

the known status of the tower

any planned works at the tower

relevant local or community issues

particularly to identify any problems that may impact on the tower’s suitability, including its structural capacity, to support a telecommunications installation. Where

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available, sources of loading diagrams, clearance diagrams, reports and drawings will be identified and the information provided to the Telco.

The Telco must provide Ausgrid with sufficient information about the experience of the proposed structural design engineer for the project to show that the requirements of this Standard will be satisfied.

5.2.1.1 Structural Design Engineer The Telco’s structural design engineer must:

be a Senior Member, Fellow or Chartered Practitioner of the Institution of Engineers Australia

demonstrate recent experience in the design of high voltage steel towers

be suitably qualified to design and review designs regarding modifications to HV towers

supply a Curriculum Vitae and contact details with two relevant referees

supervise, check and endorse all work carried out by the engineer’s partners, employees, contractors and agents

supply signed certificates for the design and construction of the project, affirming that each telecommunications installation is fit and safe for its intended use, and with annual maintenance, or any other maintenance specified by the engineer, is likely to remain fit and safe for its intended use for the next 15 years.

Ausgrid will review the proposed engineer’s experience, and, if it is acceptable, give written approval of the engineer’s involvement in the project, which Ausgrid may revoke in its absolute discretion. For the period that the approval is current, the engineer will be known as the “Approved Structural Engineer”.

5.2.2 Detailed Investigation/Design Phase

5.2.2.1 Inspection Prior to commencement of the detailed design, Ausgrid’s Enerserve subsidiary shall conduct a detailed assessment of the HV tower by climbing the tower and examining and reporting any change from the original design. This inspection shall include the following:

(a) Assess the condition of all members, including measurement of any loss of section and recording the extent of damage against each member (using the member numbering system from the tower construction drawings and the forms available for this purpose as part of routine maintenance work).

(b) Record any damage or distortion of members including damage due to mechanical impact.

(c) Record any nuts and bolts found to need replacement.

(d) Record any areas of rust and their extent or loss of galvanising/onset of surface rust (to determine the need for painting or remedial works).

(e) Record any apparent movement, subsidence or damage to the foundations.

(f) If the tower has grillage foundations, then a test shall be made of the condition of the foundation. This may involve some excavation and inspection of the steelwork below ground level.

(g) During the site investigations, measurements shall be made of the tower footing resistance, and a diagram prepared of the electrode configuration for the tower. A copy of this diagram and associated values shall also be forwarded to Network Facilities Access Co-ordinator.

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The Telco must conduct a detailed structural review of the HV tower and the surrounding environment, including the following:

(a) The Approved Structural Engineer must check all available loading and strength information, including:

the number and size of conductors

foundation stability and movement

corrosion or any other damage

the effects of wind, water and seismic activity

the effect of other loads, eg, antennae

(b) Any damage due to corrosion or other causes listed in the detailed inspection report provided by Enerserve and taken into account in the structural design check of the HV tower.

If drawings of tower foundations are not available, or if the tower has a grillage type foundation, it may be necessary for the Telco to undertake more detailed investigations into the integrity and adequacy of the foundations, after discussion with Ausgrid. If drawings sufficiently accurate and detailed to describe and carry out a structural analysis of the HV tower:

exist, then the Approved Structural Engineer must confirm that the HV tower was constructed as specified by the drawings, including what variations apply; or

do not exist or are insufficient, then Telco must supply to Ausgrid detailed engineering sketches to suit.

Telco must, at the conclusion of this phase, submit to Ausgrid an Inspection Report consisting of survey results, all relevant drawings and any other information required by Ausgrid.

Telco must report to Ausgrid as soon as practical any (actual or likely) inadequacy or significant structural damage regarding the HV tower.

The HV towers carry live conductors. Accordingly, procedures for working safely around live conductors must always be followed and as a minimum in accordance with Ausgrid’s Electrical Safety Rules, current edition. The current edition may be confirmed by contacting:

Manager - Technical Document Management GPO Box 4009, Sydney NSW 2001 Phone: (02) 9272 3771

5.2.2.2 Structural Design A structural design check must be completed by the Approved Structural Engineer to determine the effect of the additional loads resulting from the installation of the telecommunications installation and associated equipment.

If the reliability of the existing HV tower is likely to be affected by the proposed installation, then strengthening must be installed at Telco’s expense. Strengthening must not interfere with or degrade either the performance of the HV tower, or the ability of Ausgrid to undertake maintenance or other work on the HV tower, its conductors and other equipment.

The Telco and the Approved Structural Engineer must assume that all strengthening work is carried out with the HV tower’s conductors being “live”. In special circumstances, a limited power outage may be possible.

The Telco must submit the following documents in triplicate for the review of Ausgrid:

the Inspection Report (updated and revised if required)

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design calculations

drawings and drawing lists

specification of proposed works, including a draft Work Method Statement

any other information necessary to complete the installation

design certification from the Approved Structural Engineer

other documents such as reports on the community consultation process, etc as described elsewhere in this Standard.

Telco must promptly supply to Ausgrid any additional information, in the type and form specified by Ausgrid, necessary to verify that the proposed installation satisfies this Standard. Ausgrid will complete its review as soon as practical, and in most cases within 28 days after receiving all information sought from the Telco.

If a design is rejected by Ausgrid, any resubmitted design will be reviewed as if it is a new design.

The Telco will bear all its costs arising out of any delay to the Telco’s works program if Ausgrid rejects a design or has not completed its review.

5.2.3 Construction Telco must supply for Ausgrid’s review a Work Program and Work Method Statement detailing the safe work procedures to be employed on the installation.

Ausgrid requires at least five working days notice to arrange for a Tower Works Co-ordinator (may be reduced with long term projects) and to assess the Work Method Statement.

The Telco must issue an order to the Contracts & Distribution Engineering Services section of Ausgrid’s Enerserve Subsidiary for the services of a Tower Works Co-ordinator. Telco must bear the cost of that coordinator.

Older HV towers were generally not designed for modern construction loads. Telco must ensure that people working on older HV towers take precautions to ensure no members are over stressed, and that the necessary procedures are incorporated into Telco’s Work Program and Work Method Statement.

Once fully satisfied, Ausgrid will issue a licence to the Telco authorising the supply and installation of the proposed telecommunications installation on the site.

Work must not commence on site until approval is issued by Ausgrid, and training has been completed by the Telco’s staff and contractors in accordance with Appendix B.

5.3 Technical Structural and Civil Specification

5.3.1 Structural and Civil Works - General Telco must ensure that all construction works are completed in accordance with this Network Standard, the drawings and Ausgrid’s written instructions issued during the course of the works.

Telco is strictly prohibited carrying out any work on or to HV towers or their foundations, except for the minor exceptions specified under sections 5.4 and 5.5 of this Standard. Accordingly, Telco must engage Ausgrid, or Ausgrid’s approved contractors, as independent contractors directed and coordinated by Telco to carry out any work on or to HV towers or their foundations, including ongoing maintenance and modifications, at rates agreed between the parties.

Work on or to HV towers or their foundations under this Standard includes:

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(a) Attaching cables, cable ladder, cable labels, antennae and any other materials related to the telecommunications installation supplied and delivered to site by Telco.

(b) The strengthening, modification and maintenance of the HV tower arising out of the telecommunications installation.

(c) Any work within the “zone of influence” (see below for a definition) of an HV tower footing.

(d) Any ongoing maintenance and modification to equipment or the HV tower arising out of the telecommunications installation.

(e) Modification to HV tower metal work and foundations with all climbing equipment, tools, metalwork, bolts and any related HV tower structural materials supplied by Ausgrid, or Ausgrid’s approved contractors, at Telco’s expense.

Before completion, all works must be inspected by the Tower Works Co-ordinator.

All dimensions specified on drawings must be verified on site by the Telco, who is responsible for their correctness. All connections and relationships to existing structures must be verified on site by the Telco.

The Telco will be responsible for maintaining all structures in a safe and stable condition during construction, and no structure may be overstressed.

All workmanship and materials supplied by the Telco must be in accordance with current standards issued by Standards Australia International Limited and the by-laws and ordinances of relevant government authorities.

The power, telecommunications, earth and feeder cable routes must be set out by the Telco in accordance with the requirements of this Network Standard.

All equipment and cabling, both above and below ground, must be clearly marked by the Telco with the following information:

ownership (ie, the Telco)

type of equipment

location marker where applicable (eg, underground cable markers to follow the run of underground cables).

Excavations must be carried out by hand when in close proximity to existing services or when the location of existing services are not known. The requirements of NS156 “Working Near or Around Underground Cables” applies when working in close proximity to Ausgrid’s underground cables. When working inside substations, only hand excavation may be employed for depths less than 1.5 metres. Refer to NS165 for details of civil work inside Ausgrid substations.

If fixing to an existing structure, the Telco must make good any damage to protective coatings, in accordance with the coating Manufacturer's specifications.

Where proprietary hardware is specified in drawings or other documents, the use and installation of that hardware must be in accordance with the manufacturer's specifications, unless noted otherwise.

Before construction commences, the Telco must obtain from the Approved Structural Engineer approval regarding the construction drawings, and in particular, confirmation of the specifications for each HV tower foundation, its location and level prior to construction.

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1

2

EXCAVATIONEDGE OF "ZONE OFINFLUENCE”

Temporary excavation for minorservices, less than 1m wide x 0.5m deepare acceptable

Figure 1

Unless otherwise permitted in writing by Ausgrid, excavation must not be carried out adjacent to a footing if the excavation is likely to encroach on the “zone of influence” of the footing, as shown in the above diagram.

Earthworks must not raise the level of the ground surrounding the tower legs or be constructed such that water collects around the tower legs as a consequence.

5.3.2 Design Constraints Equipment mounted to HV towers must not protrude beyond the climbing corridor (ie, 0.7 metres). The supporting steelwork for the telecommunications installation must be designed and installed so that it does not restrict the climbing or rigging on an HV tower used for regular transmission line maintenance and construction procedures.

Holes must not be drilled in the HV tower metal work without written permission from Ausgrid. No welding may be used on HV tower structural components except as detailed in Ausgrid’s specifications. Step bolts must not be removed as part of the works. Cable clamps, if used on the HV tower climbing leg, are to be located just below the step bolts and on the inside of the leg.

Cable clamps (used to secure the feeder cables to the support brackets) must be 316 grade stainless steel unless otherwise approved in writing by Ausgrid. Signs erected on HV towers must be secured with epoxy glue or clamps (no drilling).

Normally, no more than two telecommunications installations are permitted on each HV tower.

The Equipment Cabin must be constructed in accordance with the Building Code of Australia and the Australian Standards specified in this Standard.

5.3.3 Detailed Structural and Civil Design

5.3.3.1 Extent of Work This section of the Network Standard covers the design, fabrication, supply and delivery to site of additional galvanised steel members (including all nuts, bolts, and washers).

5.3.3.2 Structural Checking and Design Analysis Methods

The structural analysis of HV towers must be based on a first order linear analysis using the stiffness matrix method of analysis. Computer programs based on manual or graphical methods of analysis must not be used.

HV tower members that are:

(a) Essentially continuous (eg, corner members) must be modelled as continuous beam members.

(b) Connected to other members by two or more bolts must be modelled with moment connections, except where it can be shown that the normal bolted connection tolerances will allow rotation of the member ends sufficient to form a pin connection.

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(c) Not specified above, must be modelled with pin connections; and

(d) Not triangulated must not be modelled as triangulated, eg, chords in cross arms that do not intersect at the actual load application point.

Secondary bracing must be included in the tower model at locations where the bending stiffness of the tower members may significantly influence the calculated distribution of member forces, eg, in leg panels above foundations and at changes in leg slope.

If calculations indicate high bending moments in members, then this must be immediately reported to Ausgrid and investigated the Telco who must determine if the calculated moments are correct or a modelling anomaly. Telco’s investigations must, when appropriate, include an examination of the rotational restraint inherent in the bolted joints at or near these locations.

Design Loads

The HV towers were designed in accordance with the codes and practices of the time. Design loads are as indicated on the design load tables and/or load trees. An analysis of a tower for these design loads using the prescribed computer methods and member strength formula may indicate stresses greater than the member capacity. In order to assess the effect of the additional telecommunications installation loads on the reliability of an HV tower, three separate load sets must be analysed as follows:

Load Set 1: The original loading used to design the towers, adjusted to reflect the actual spans and conductor deviation angles at the tower. This analysis will be used to establish a base level of member stresses in the tower. Unless stated otherwise, it may be assumed that the original design loads are ultimate loads and that the appropriate load factors have been applied.

Load Set 2: Loads from telecommunications installations only. This analysis must be based on AS3995 “Design of steel lattice towers and masts” load requirements and must consider the wind direction relative to the installation. However, the wind velocity must be based on wind velocity that is consistent with the design loads for the HV tower. The determination of that velocity must be based on AS/NZS 7000 load formulae.

This analysis is intended to isolate the effects of telecommunications installation loads (such as antennae) and is used in the design of members directly supporting the installation and in Load Set 3.

Load Set 3: Combination loads from load Sets 1 and 2. The load shall include combinations of the original and the telecommunications installation loads, which are appropriate to the assumed wind direction in Load Set 1, and combinations of the original loads, adjusted to reflect the more severe installation loadings, and those corresponding installation loads (Load Set 2). Calculation of the “adjusted” wire and tower wind loads for wind direction must be based on AS/NZS 7000 loading formulae.

For Load Set 3 the Approved Structural Engineer must consider at least two different wind directions, or more if the results of Load Set 2 suggest that that other wind directions may produce higher member forces in the Load Set 3 calculation.

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Application

Any increase in load on governing members in an HV tower will reduce the tower’s reliability. Ausgrid will categorise the HV tower according to the acceptability of reducing its reliability. Any strengthening required must be paid for by the Telco as part of the cost of installing the telecommunications equipment.

The factors Ausgrid considers in determining the effect on reliability of an HV tower are:

the situation and circumstance of the tower, including its relationship to other structures, major roads or inhabited areas

the consequences of any loss of electricity supply.

The categories are set out in the following table.

Tower Risk Category

% increase in the stress level in governing members

A No increase

B 5% increase

C 10% increase

Calculation of the increase in stress levels must be based on the difference between Load Set 1 and Load Set 3. The limiting stress for all other members must be that set by the governing member stresses. The strengthening criteria for the HV tower must be in accordance with the Tolerable Increase in Stress table on the following page.

Design Requirements for HV Tower Strengthening

Member strengths must be based on the design requirements specified in section 4.3 of this Standard.

The position of attachment of antennae must ensure that the clearances between live conductors and HV tower steelwork are not less than those shown on clearance diagrams or specified in AS/NZS 7000.

A design check must be made of the joints at any points of critical loading.

The ultimate design stresses in bolt shear and member bearing must not exceed the following values:

Tower bolts in shear 290 MPa

Bearing stress on steel ply 2.0fsy MPa

These values may be assumed to incorporate the appropriate capacity factor.

The design must be such as to keep the number of different parts to a minimum in order to facilitate transport, erection and inspection. Pockets and depressions likely to hold water must, where possible, be avoided and, if unavoidable, an outlet must be provided to ensure proper drainage.

The minimum thickness of the corner legs of the HV towers must be 6 mm, and for other members, 5 mm. Inclined secondary bracing members which carry nominal loads only and cannot afford a foothold to climbers (inclined at greater than 30 degrees to the horizontal) may have a minimum section of 38 mm x 38 mm x 5 mm fastened with 12 mm diameter bolts. In all other cases, the minimum member size must be 44 mm x 44 mm x 5 mm.

Except for HV tower designs that have been previously approved by Ausgrid, the use of 12 mm diameter bolts is to be limited to secondary bracing members, above the level of the anti-climbing device only.

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Compression members must be rolled steel sections. Tension members must be of rolled steel sections or flats with the exception of members subjected to vibration, where flats shall not be used. Gusset plates shall be of AS3678 Grade 250 material.

The member slenderness ratio must not exceed the following values:

Main compression members 120

“K” bracing for leg extensions 150

Primary bracing members 200

Secondary bracing members (having only nominal compression loads) 240

Tension only members 400

The lengths of members must be based on the length between the intersection of gauge lines.

The members of the diagonal bracing system including plan bracing must be designed to carry compression as well as tensile forces.

Structural members other than gusset plates must normally not be bent. If the detailed design requires a bent member, this bend must be incorporated into a joint containing one or more bent or fabricated gusset plates.

All HV tower body members that subtend an angle of 30 degrees or less to the horizontal and therefore may be used for climbing must be capable of withstanding, without permanent distortion, a concentrated vertical load of not less than 1.5kN mid span corresponding to the mass of one person with tools. This load must be assumed to act in addition to other specified design loads, under maintenance or stringing conditions only.

Calculations and Documentation

Design documentation complying with the following must be supplied by the Telco for each telecommunications installation.

Design calculations for steelwork, concrete and foundations. The stresses used in the design of members, connection bolts and welds for the various qualities of steel used in the design must be clearly indicated.

Calculations for HV towers must include, but not be limited to, the following:

(a) Tabulated wind areas for the HV tower steelwork and ancillaries and resulting loads applied to each panel of the tower.

(b) Tabulated antenna loads, including vertical loads for each antenna level on the HV tower.

(c) Load diagrams (load trees) for each load condition considered in the design of the HV tower.

(d) Tabulated node, member and load data. This data is also required in electronic format (eg floppy disc) to facilitate importing the data into an analysis program.

(e) Outline diagram of the tower showing the principal dimensions and member groupings used in the design summary sheet.

(f) Tabulated Design Summary showing for each design member group:

Referenced detail drawing number

member group designation

member section

overall length of member

material stress grade

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design compression and tension loads and corresponding load case number (or description) and computer model member number for governing member

bolt number and size

member length factor for each axis

l/r ratio

AS3995 member capacity equation number

kl/r value

member capacity

% member use

% bolt use.

All calculations must be verified as per the specified QA requirements. Self-verification will not be accepted.

The design documentation must be bound into a report, which must include the Inspection Report. The report must include any necessary discussions and correspondence regarding the investigations, conclusions and recommendations for any works required on the HV tower. If reinforcement of the HV tower is recommended, an outline drawing showing the proposed works must be included in the report.

Drawings – General Requirements

Telco must give Ausgrid copies of all drawings used in specifying Telco’s telecommunications installation contemplated under this Standard.

Current drawings regarding the telecommunications installation must be submitted to Ausgrid’s Network representative for review before any work commences, and at other times notified to Telco by Ausgrid.

Construction and installation works must not commence until:

all necessary revisions and amendments to the drawings requested by Ausgrid have been completed to its satisfaction

Ausgrid has notified Telco that it has concluded a review of the drawings regarding those works.

Drawings submitted for Ausgrid’s review must be supplied as either:

five sets of full sized prints; or

electronic format compatible with the latest release of AutoCAD or Microstation software, as nominated by Ausgrid, and 2 sets of full sized prints

with “as built” drawings supplied by Telco to Ausgrid in accordance with subsection (b).

All drawings must:

(a) Specify all dimensions for new works and all other dimensions and information necessary to fully define the telecommunications installation, and safely and correctly construct and maintain it.

(b) Where the drawing includes sections or elevations: include a reference datum, with all measurements referred to this datum.

(c) Include, where relevant, references to provisions in this Standard (and if suitable, relevant parts of the provision).

(d) Contain appropriate cross-references to other relevant drawings.

(e) Be to ISO-A and ISO-B and either A0, A1, A2, A3, A4 or B1 sizes.

(f) Comply with the latest edition of the 1100 series of Australian Standards.

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(g) Include a drawing border.

(h) Include a blank rectangular space of 90mm wide x 50mm high, immediately above the title block for the addition by Ausgrid of its drawing number, at a time to be determined by Ausgrid.

(i) Include at least one amendment, revision or issue table.

(j) Not bear Ausgrid's name or logo, unless Ausgrid has undertaken the design related to the drawing.

(k) Include title blocks with the following minimum information:

asset number or description of new and existing equipment, so that Ausgrid can readily identify all equipment if required;

geographic location of HV towers and surrounding parts of the telecommunications installation;

scale for each view contained on a drawing

drawing number and any amendment, revision or issue numbers

date of original design and subsequent amendments, revisions or issues

printed name and signature of the Approved Structural Engineer or the Approved Electrical Engineer or both when appropriate.

Telco must annotate and submit 'as built' drawings of the telecommunications installation on completion of all works.

Drawings – HV Towers

Drawings required for strengthening of the HV tower must consist of general arrangement, erection drawings and workshop drawings for each of the component sections of the HV tower. Such drawings must include a location diagram showing the relationship of the component sections on each drawing to the adjacent component sections of the structure. Steelwork drawings must indicate the weight of steel required (in each steel grade) and the erection mark of each member, the direction and position of the standing flange of each member, the full detail of all welds, and the number, diameter and length of bolts used at each connection.

Dimensions must include lengths, pitch distances, edge distances and back gauges, etc, in order to enable checking of clearances and replacement members to be fabricated without the necessity of reference to a separate detailed drawing of an item. Where lock nuts are used in addition to the standard nuts, this detail must be added to the drawing. These drawings may be of the single line type, the lines being broken in such a manner as to indicate what member is outermost at the cross-over of two members. Each member that is made of 350 grade steel must clearly be shown with a distinguishing mark on the drawings.

The drawing list must include all drawings with the current date, revision, title, drawing description and the contract number.

At the conclusion of work on site, the Telco must submit to Ausgrid “as built” drawings of the work to Ausgrid’s requirements, including a construction certificate from the Approved Structural Engineer.

5.3.3.3 Fabrication of HV Tower Members New or replacement HV tower members must be fabricated from mild steel or high-tensile steel conforming with AS3678 and AS3679.1.

Details of additional or replacement steelwork and foundations must be provided by Telco to Ausgrid. Steel may be provided either by the Telco or Ausgrid as negotiated between Telco and Enerserve. The actual strengthening work shall be carried out by Enerserve or their sub-contractors.

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5.3.4 Shoring of Excavations and Temporary Supports The stability of the HV tower or any other Ausgrid asset must be maintained at all times during construction and maintenance operations by the Telco and its contractors. Temporary shoring or bracing must be used as necessary to keep the HV tower stable at all times, ensuring that no part of the HV tower becomes over stressed.

The Telco must supply to Ausgrid a Geotechnical report that must identify:

mine subsidence

acid sulphate soils

earth resistivity levels (only for HV towers located in substations)

differential settlement.

The report must include displacement calculations when the work is conducted as a low impact project under the Telecommunications (Low-impact Facilities) Determination 1997, as updated from time to time.

5.3.5 Road Works Any road works undertaken by the Telco must be as follows:

all topsoil and all other organic material removed

exposed subgrade to be proof rolled to an in situ density not less than 98% standard dry density at optimum moisture content in accordance with AS1289

sub-base material must be crushed sandstone material, free from stones larger than 75mm and any organic or other deleterious matter

sub-base material must be placed in layers not exceeding 200 mm loose thickness and compacted uniformly to 95% modified maximum dry density compaction in accordance with AS1289

base course must be 100mm crushed rock (DGB20), compacted to 100% modified maximum dry density in accordance with AS1289. The top surface of the base course must be trimmed and compacted to the crossfalls shown on the drawing.

Existing roads and tracks shall be made good on completion of the construction work, including disposal of all waste material in accordance with local council and EPA requirements.

5.3.6 OH&S Signs Telco must supply and erect signs warning of the presence or hazards of proximity to radio frequency radiation, including information on the owner of the telecommunications installation. All signs must satisfy all relevant legislation and codes of conduct.

5.3.7 Prevention of Access to HV Towers Telco must ensure that the telecommunications installation, including the Equipment Cabin, cable ladders and other hardware must not facilitate unauthorised climbing onto the HV tower. Where site conditions make access to the roof of the Equipment Cabin possible, Telco must install barbed wire to the relevant Australian Standard.

In the design proposal, Telco must explicitly indicate where it proposes to raise existing anti-climbing devices on HV towers to ensure compliance with this section.

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6 ELECTRICAL INSTALLATION

6.1 General The erection of telecommunications installations on HV towers is an uncommon arrangement, not expressly covered under AS/NZS 3000:2000, and accordingly is deemed an “Alternative Arrangement” under AS/NZS 3000:2000 (Section 1.6).

Telecommunications installations at HV towers must comply with:

this Standard

Section 1.6 of AS/NZS 3000:2000

the relevant provisions of the NSW Service and Installation Rules regarding the installation of the service line, consumer mains, metering and main switchboard (at the meter location).

Prior to commencing work on site, application for connection must be made to the local Customer Supply office in accordance with the provisions of ES 1 Part A: Customer Supply Information and Part B: Local Service and Installation Rules.

All Telcos must comply with section 4.3.1 of this Standard, and accordingly are strictly prohibited for carrying out any work on or to HV towers or their foundations, except for the minor exceptions specified under sections 5.4 and 5.5 of this Standard.

All Telcos must comply with the section titled “Drawings – General Requirements” under section 4.3.3.2 of this Standard, and supply to Ausgrid all drawings specified in that section.

All Telcos must engage an electrical engineer who must:

(a) Be a Senior Member, Fellow or Chartered Practitioner of the Institution of Engineers Australia.

(b) Supervise, check and endorse all work carried out by the engineer’s partners, employees, contractors and agents.

(c) Supply signed certificates for the design and construction of the electrical works of the installation of the telecommunications equipment, affirming that each is fit and safe for its intended use, and with annual maintenance, or any other maintenance specified by the engineer, is likely to remain fit and safe for its intended use for the next 15 years.

For the period that the approval is current, the engineer will be known as the “Approved Electrical Engineer”.

The Approved Electrical Engineer must design and verify as correct the electrical design of Telco’s telecommunications installation before any on-site work commences, during installation (particularly regarding the installation of the underground submains and earthing system) and at the completion of all electrical works before “go-live”.

6.1.1 Scope of Electrical Installation Work by First Telco As part of a telecommunications installation at an HV tower the First Telco must supply and install:

(a) Consumer mains from the point of attachment agreed with Ausgrid to a pole mounted PVC meter panel installed at least 20 metres from the HV tower.

(b) An underground submains run from the meter panel to an Equipment Cabin (built by the First Telco at the base of the HV tower).

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(C) An Isolation Panel mounted on the outside of the Equipment Cabin.

(d) A submains run from the Isolation Panel to First Telco’s distribution board (mounting location subject to First Telco’s requirements).

(e) Final subcircuits run from the distribution board to telecommunications equipment and electrical installation.

(f) A manual transfer switch (in the Equipment Cabin/ Isolation Panel), permitting electrical power to be sourced from either mains or generator supply (if Telco chooses to have a generator backup option).

(g) A complete earthing system for the Equipment Cabin, joined to the HV tower earthing system.

Subject to First Telco’s requirements, the telecommunications installation may include:

(a) Within the Equipment Cabin:

air-conditioning unit(s) and an air-conditioning control panel

security system components and a security control panel

a battery backup unit

(b) A portable generator unit used to supply temporary power to Telco’s telecommunications installation, pad mounted outside the Equipment Cabin.

(c) An Isolation Panel.

6.1.2 Scope of Co-location with other Telcos If an additional Telco wants to co-locate its telecommunications installation at an HV tower that already has the telecommunications installation of another Telco installed (or Ausgrid has granted written approval for another Telco to attach its installation), then the additional Telco must:

(a) Upgrade or replace the existing meter panel so that there is one common meter housing for all of the Telco’s meters.

(b) Install its own meters and equipment in the common meter panel.

(c) Build its own Equipment Cabin at the base of the HV tower.

(d) Install its own underground submains run from its metering equipment in the meter panel to its Equipment Cabin.

(e) Install its own electrical installation in accordance with Figure 1A or 1B, including an isolating transformer, control equipment, transfer switch, distribution board and which may include within the Equipment Cabin an air-conditioning unit(s), air-conditioning control panel, security system components, security control panel, battery backup unit and a portable generator unit used to supply temporary power to Telco’s telecommunications installation, pad mounted outside the Equipment Cabin.

(f) Supply and install a complete earthing system for its Equipment Cabin, joined to the HV tower earthing system, and any additional earthing that may be required to maintain the standard of earthing existing for any other Equipment Cabin(s) built at the HV tower.

Telcos with a telecommunications installation at a particular HV tower, or written approval from Ausgrid for an installation at that HV tower, must liaise with Ausgrid to confirm and co-ordinate submains and equipment location for any telecommunications installations proposed by another Telco.

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6.1.3 Installation of consumer mains by First Telco Ausgrid will extend the existing low voltage supply to an agreed point of attachment located adjacent to3 the property boundary. The point of attachment must be at least 20 metres from the HV tower and associated metalwork (including buried metalwork), except where permitted otherwise in writing by Ausgrid. From the point of attachment, the First Telco must install their consumer’s mains to the meter panel. Refer below for details regarding meter panel installation.

6.1.4 Meter Panel for Single Telecommunications Installation The First Telco must supply and install a new metering panel to suit the number of phases required by its telecommunications installation.

For an overhead low voltage network, the panel must be mounted within a pole mounted PVC weather-proof enclosure located adjacent to the property boundary complete with two padlocks keyed to Ausgrid’s requirements.

For an underground LV network area, the panel may be mounted on a steel pole in a PVC weather-proof enclosure, or in a suitable weather-proof box mounted on the ground in accordance with Section 4 of the NSW Service and Installation Rules. The First Telco must liaise with Ausgrid to determine a final mounting location. Service fuses, main switches and neutral links must be installed in the panel in accordance with the NSW Service and Installation Rules and ES 1.

The First Telco must pay for all charges and works to install Ausgrid’s metering including the supply and installation of isolation transformers, links, fuses, battens, meter bases and meter cabling, ready for connection by Ausgrid.

6.1.5 Meter Panel for Co-location with another Telco If a second Telco wants to co-locate its telecommunications installation at a HV tower that already has the telecommunications installation of another Telco installed (or Ausgrid has already granted written approval for another Telco to attach its installation), then the second Telco must upgrade or replace the existing meter panel so that there is a new grouped metering panel in accordance with Section 4 of the NSW Service and Installation Rules for all of the Telcos’ meters.

The panel must be mounted within a pole mounted PVC weather-proof enclosure located adjacent to the property boundary as nominated on accompanying drawings and must include two (2) padlocks keyed to Ausgrid requirements. The Telco must liaise with Ausgrid to determine the final location.

The Telco must allow for all charges and works associated with the upgraded or new metering installation, including changes to existing equipment, the supply and installation of isolation transformers, links, fuses, battens, meter bases, keys, etc, and meter cabling ready for connection by Ausgrid.

6.1.6 Submains from the Meter Panel Each Telco must run an underground low voltage submains from the meter panel to its Equipment Cabin. The Telco must liase with Ausgrid to confirm and co-ordinate submains installation arrangements. The Telco must notify Ausgrid of the number of phases and rating of the LV supply required, which must be either a three phase supply with no neutral conductor, or a single phase supply. For three phase supplies, there must be no metallic sheathing on conductors to provide an inadvertent earth return path.

Prior to commencing any excavation work, each Telco must employ a professional underground service locater to verify the exact location of existing services through all proposed construction areas and underground routes. Excavation in the vicinity

3 If the pole and point of attachment are in the roadway, then before any work commences the First Telco must obtain local council approval. If the point of attachment is on private property, then the lease covering the telecommunications installation must also cover the sub mains.

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of any underground services must be in accordance with the requirements of the owner of the service. Each Telco must bear the cost of repairing any damage it causes to existing services.

6.1.7 Installation of Submains from the Meter Panel Submains from the meter panel to the Equipment Cabin (through the transmission line easement) may be run parallel with the high voltage transmission lines providing that the total combined length of parallel run is less than 200 metres. Where possible, submains must be run well outside the transmission line easement and only cross the transmission line easement perpendicular to the transmission line to enter the Equipment Cabin.

If the Equipment Cabin is located inside the base of the HV tower, the final approach of the submains to the Equipment Cabin must be at right angles to the face of the HV tower and towards the centre-line of that tower. This arrangement is intended to avoid contact with any existing buried counterpoise earthing conductors possibly radiating out from the HV tower legs. If the Equipment Cabin is not located inside the base of the HV tower, then the Telco must use its best efforts to locate the buried earthing conductors of the HV tower and avoid damaging them when running the submains.

Submains cables must be double insulated and installed underground in HD UPVC conduit for the entire length, glued at all joints to prevent the ingress of moisture. The insulation level achieved by this cable and conduit combination must be maintained from the meter panel to the terminals on the primary side of the isolation transformer in the Equipment Cabin.

6.1.8 Supply System Characteristics The electrical supply system characteristics (at the distribution centre busbar) will be as follows:

415 volts, three phase, four wire, 50 Hertz.

Maximum prospective fault level 10kA in residential areas or 30kA in commercial/industrial areas unless noted otherwise on the drawings or as nominated by Ausgrid.

The MEN system of earthing must not apply beyond the meter panel, however, the design and construction of the local earthing system for the telecommunications installation must, in general, be in accordance with the principles of a MEN system.

The earthing system for the secondary side (ie, load side) of the isolating transformer (housed in the Equipment Cabin) must be segregated from the MEN system of the low voltage network. The earth connection of the telecommunications installation at the HV tower site must be connected in common to the star point of the isolating transformer secondary. The star point of the isolating transformer secondary must be connected to the earth mat for the telecommunications installation, and the base of the HV tower, as described below.

Unless otherwise expressly stated in this Network Standard, all equipment supplied and used in the telecommunication installation must be rated for a working voltage of 415/240 volts, 50 Hertz, AC.

6.1.9 Isolation Panel The First Telco must supply and install an Isolation Panel as follows:

(a) Lockable, supplied with locks or padlocks keyed to Ausgrid’s requirements.

(b) Vandal proof.

(c) Weatherproof (rated IP66 in accordance with AS1939).

(d) Mounted on the outer wall of the First Telco’s Equipment Cabin.

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(e) Complete with isolation switches and voltmeters to enable an operator standing at the face of the Isolation Panel to isolate all electrical conductors emanating from the Isolation Panel, and confirm isolation with reference to voltmeters4.

(f) Complete with a single line diagram showing incoming and outgoing circuits to the Isolation Panel and all equipment within it.

(g) Designed to allow one additional Telco to share the Isolation Panel and permit that Telco to install all necessary cabling and equipment to satisfy clause 6.1.9(e) of this Standard.

(h) Complies with the requirements specified in Figures 2a or 2b.

If an additional Telco wants to co-locate its telecommunications installation at an HV tower that already has the telecommunications installation of another Telco installed (or Ausgrid has granted written approval for another Telco to attach its installation), then the additional Telco must:

(a) Use the existing Isolation Panel and supply and install all necessary modifications and additions (particularly to satisfy clause 6.1.9). The existing Isolation Panel will in general be mounted on to the outer wall of the First Telco’s Equipment Cabin, supplied and installed by the First Telco.

(b) Supply all modifications and additions to the Isolation Panel ensuring compliance with the labelling and segregation requirements of AS/NZS 3000:2000.

Figure 2a: single line diagram - separate ac isolation switch

4 Isolation and metering of the dc circuitry only (not ac) may be requested by Telco. This may be acceptable, provided dc only isolation guarantees that no antenna on the installation is active.

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Figure 2b: single line diagram - combined transfer/ac isolation switch

6.1.10 Generator Supply For:

three phase installations, each Telco must supply and install a 50A, 5 pin IP56 rated male power socket

single phase installations, each Telco must supply and install 50A, 3 pin IP56 rated male power socket,

mounted on the outside of the Telco’s Equipment Cabin so that Telco’s telecommunications installation may be powered from a portable pad mounted generating unit as an when required.

Any mobile generator unit that Telco uses must be installed in accordance with the relevant requirements of AS/NZS 3000:2000 and relevant Australian Standards (eg AS 3010.1-1987: Electrical installations - Supply by generating set - Internal combustion engine driven sets) and section 8 of Ausgrid’s Local Service and Installation Rules.

The wiring from the above power socket must be terminated on to a two position (ie, Mains and Generator), four pole, manual transfer switch. The transfer switch:

(a) Must switch all phases, including neutral, between mains and generator supply.

(b) Must have its mains supply served from the main circuit breaker mounted on the wall of the Equipment Cabin, with that circuit breaker served from the load side of the isolating transformer.

(c) May be installed inside the Equipment Cabin or in the Isolation Panel, except if it serves as the AC isolation switch, then it must be installed in the Isolation Panel and must be a three position switch, with an OFF position as well as the Mains and Generator positions.

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(d) Must be lockable, supplied with a padlock keyed to Ausgrid’s requirements.

Safety and operating signs must be erected near the male power socket on the outside of the Equipment Cabin warning of, as a minimum, the presence of the isolating transformer and the possible touch potential hazards.

Note: Safety hazards may arise due to the presence of a motor generator set close to the HV tower. The Telco must include protection of tower from fire damage in their risk assessment strategy.

6.1.11 Isolation Transformer Each Telco must supply and install a low voltage isolation transformer with the following characteristics:

(a) 415V/415V-240V, 30 kVA enclosed type power isolation transformer, delta - star connected complete with inter winding earthed screens

(b) Power frequency withstand of no less than 28 kV for 60 seconds and lightning withstand of no less than 70kV for a standard 1.2/50 S waveform between primary and secondary transformer windings, and between each winding and earth.

(c) Fully insulated active and neutral (where applicable) terminals on both the primary and secondary sides.

(d) Mounted in accordance with manufacturer’s recommendations.

(e) All connections specified and configured to maintain required insulation levels.

(f) The isolation transformer’s enclosure must be:

louvre ventilated indoor type with ingress protection rating of IP40

powder coat finished

bonded to the common earth system (ie, in common with the star point of the isolating transformer secondary).

6.1.12 Protection and Control of Low Voltage Installation Control and protection must be provided on the load side of the isolation transformer by the main circuit breaker.

6.1.13 Mains Supply Isolation Telco may supply and install an “ac isolation switch” on the equipment cabin external wall within the 'Isolation Panel' enclosure (refer to section 6.1.9). This ac isolation switch shall be a suitably rated switch on the load side of the manual transfer switch, or the transfer switch itself (in which case, the manual transfer switch must have an OFF position - see Figures 2a and 2b). A voltmeter shall be installed to confirm AC power isolation.

6.1.14 Battery Backup Supply Isolation If Telco includes a Battery Backup as part of its telecommunications installation, then the Battery Backup unit must be installed in the Telco’s Equipment Cabinet and include the following:

DC isolation switch that isolates all conductors run from the battery backup unit

appropriate labelling adjacent to the DC isolation switch

a voltmeter mounted on the Isolation Panel that must confirm DC power isolation as indicated in Figures 2a or 2b as appropriate

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suitably rated and insulated conductors, fuses, and other wiring to suit Figures 2a or 2b as appropriate.

Telcos must mount their equipment such that the DC isolation switch is adjacent to the AC isolation switch within the Isolation Panel, and ensure all equipment and wiring is suitably segregated.

The electrical design of the installation must ensure that when both the AC and DC isolation switches are in the OFF position, all power to transmitter equipment and the antenna installations on the HV tower is dead, and no antennae mounted on the HV tower can emit any form of output.

6.2 Distribution Board An Equipment Cabin distribution board must be supplied and installed by each Telco. Refer to the sample equipment schedule (Appendix A).

6.3 Security System and Air Conditioning Control The Telco may (at its expense) supply and install in its Equipment Cabin:

air-conditioning panel (control, monitoring, etc), air conditioning units and associated control wiring

security control panel and security control and monitoring system components and wiring.

6.4 Safety And Lightning Protection Earthing System Each Telco must supply and install:

a complete safety and lightning protection earthing system which is compliant with relevant industry standards (including SA HB C(b)-1 (1999) [Special Locations] and AS 1768 Lightning Protection)

all necessary upgrades and repairs of the existing lightning protection earthing system as a result of a new telecommunications installation supplied by Telco.

Safety and lightning protection earthing systems must be consistent with the following design principles:

The Equipment Cabin must be installed within the base of the HV tower. If space is not available or another position is required, then approval must be obtained in writing from Ausgrid regarding an alternative location before any work commences.

Each Telco must undertake a risk analysis of each location proposed to erect new or additional telecommunications installations or antenna on HV towers. This analysis must consider the risk of electrical shock to:

any person in the vicinity of the HV tower’s base

any person who uses electricity in the vicinity of the HV tower supplied from the same LV network distributor as the Telco telecommunications installation.

The risk assessment must consider:

step and touch potential rises around the HV tower under fault conditions

transferred potential hazards arising from the connection of power and telecommunications circuits related to the telecommunications installation

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and, for each of the above, take into account the effect of:

the prospective fault level at the HV tower

the footing resistance of the HV tower

the presence of overhead earth wires.

Equipment Cabin Reinforcement Bonding Requirements

The following are typical construction guidelines specifying the minimum standard in most cases for equipotential bonding, shielding and current dissipation. The Telco must follow the specific bonding requirements detailed in the design drawings or specifications reviewed by Ausgrid.

(a) Reinforcing bars and mesh in both the floor and roof slabs must be solid, bonded together by welding at each cross-over around the perimeter. Wire ties must be installed at each other cross-over.

(b) At least two starter bars and the associated vertical reinforcing rods in each of the block walls must be welded together and bonded (by welding or brazing) to both the roof and floor slab reinforcing mesh. Refer to detail drawing. Wire ties must be installed at each other cross-over.

(c) Two copper earth straps (25 x 3 mm or 70 mm2 cable) must be brazed onto the floor reinforcing and brought up 200 mm above the finished floor level and adjacent to the walls inside the cabin for bolting to the cabin’s “common earth bar”. These straps must be insulated with PVC to prevent corrosion at the concrete/air interface. They will be located in accessible positions (near diagonal corners) and clear of equipment and racks set against the walls.

Building Earthing

(d) A copper earth bar (40 x 6 mm) must be installed on the walls around the inside of the cabin, approximately 150 mm above floor level. This is the “common earth bar”, mounted off the wall where necessary to permit the easy connection of earth tails run from adjacent equipment. The common earth bar must be set flush with the wall, where required, so that it does not interfere with wall-mounted equipment racks.

(e) Equipment in the cabin (other than telecommunications circuits) requiring an earth must:

be bonded to the common earth bar by a connection that is either crimped and bolted or brazed

use its own dedicated cable to connect to the earth bar, except for equipment in close proximity to each other, which may share a common bond to the common earth bar if interference is not expected

use earthing cables that are as short as possible.

(f) A separate earth bar must be provided for telecommunications equipment. This bar will be installed on insulating mountings and connected to the "common earth bar" at a single point.

External Earthing for Equipotential Bonding and Gradient Control

The safety and lightning protection earthing system is required to comply with AS 1768 and step and touch voltages as stated in SA HB C(b)-1. The HV tower site is classified as a ‘special location’ by Ausgrid due to the likely frequency of access by utility staff, Telco staff and the public. Each Telco must, where relevant to its scope of work, apply the following minimum guidelines.

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Equipotential Bonding Measures

(g) The HV tower leg carrying the coaxial cable earthing conductor and the diagonally opposite leg must be bonded to the “cabin/tower earth grid” by insulated 70mm2 stranded copper conductor . See detail drawing.

(h) The main and back-up earth bonding cables connecting the “common earth bar” to the buried “cabin/tower earth grid” must be run in glued PVC conduit to prevent ingress of moisture.

(i) All conduits must be buried at a minimum depth of 600 mm and covered by a heavy duty orange PVC cable protection strip, at least 200 mm wide and 5 mm thick and laid a minimum of 75mm above the conduit. The PVC cover strip may be replaced with a lighter plastic marker tape if the conduits are covered by asphalt paving.

(j) The ends of all conduits exposed to the weather or buried in the ground must be sealed with either polystyrene/plastic plugs or expanding foam fill to prevent the ingress of moisture.

(k) PVC insulated 70 mm2 stranded copper earth bonding conductors must be used for connections between the feeder cable earth bars and the HV tower legs. A galvanised washer that is easily replaced must be inserted between the tinned copper termination lug and the galvanising of the HV tower leg.

(l) Terminations will be made with a tinned copper single hole crimp lug and secured with an M12 (minimum) stainless steel bolt and nut. No penetrations, welding or other intrusive action on the HV tower structure must be carried out without prior written approval from Ausgrid. Where approval has been obtained to drill a hole through galvanised steelwork on the HV tower, the bare metal inside and around each hole must be coated with a zinc-rich paint (such as “Galmet”, or “Durazinc” epoxy), to replace the lost galvanising, before the insertion of a bolt. The finished connections must also be painted with the zinc-rich paint over the lug, bolt and nut to prevent corrosion.

(m) Anti-climbing wires on the cabin roof must have two separate earth bonds to the cabin earth "cage" through mounting bolts for the wire supports being welded to the roof reinforcing and cast in the concrete slab. Stainless steel M20 bolts will be used for protection against corrosion.

Ausgrid may, in the discretion of the Tower Works Coordinator, permit Telco to attach earthing conductors to the HV tower, and all drilling of the HV tower (where approved as part of those works) must be carried out in accordance with the requirements of the Tower Works Coordinator and this Standard.

Voltage Gradient Control

(n) If a substantial earthing system already exists around the base of the HV tower, it may not be necessary to establish an additional earth grid for the Equipment Cabin provided that the installation is compliant with the requirements of AS/NZS 7000 regarding safe prospective touch potentials, and if this applies the Telco may supply and install a connection from the "common earth bar" to the existing system.

(o) However, if there is not an adequate existing earth system for the HV tower complying with AS/NZS 7000, other than that provided by the concrete encased footings, then Telco must supply and install with the Equipment Cabin its own earth grid bonded to the HV tower steelwork. The new “cabin/tower earth grid” must be constructed of 25 x 3 mm copper strip and buried at 400 mm below finished ground level.

Note: Copper earthing conductors must not be used if there is direct buried HV tower steelwork or galvanised steel earthing conductors unless a maintainable cathodic protection system is also installed to prevent corrosion of the steelwork. The Telco is responsible for ongoing maintenance of the cathodic protection system.

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The “cabin/tower earth grid” must consist of two separate buried earth conductor strips. One strip must encircle the base of the HV tower including the generator pad and be laid 1 to 1.5 metres out from the HV tower legs unless approved otherwise by Ausgrid and noted on the drawings. The other strip must encircle the cabin and be laid 0.5 to 1 metre inside the HV tower legs. A vertical earthing electrode must be installed adjacent to each HV tower leg and bonded to the copper strip using an approved method to IEEE 8375. These electrodes must be either:

15 mm diameter stainless steel rods; or

25 x 3 mm copper straps or 70 sq mm stranded cables dropped in a continuous vertical length into a predrilled hole and filled with a non-corrosive bentonite slurry

Counterpoise conductors with vertical earth electrodes if these are already installed as the HV tower earthing system.

The length of the earth electrodes must be determined from on-site soil resistivity tests and must provide a sufficiently low grid impedance for protection of the installation and must not be less than 2.4 m.

The bonding conductors between the driven electrodes or the upper end of the strip-type electrodes must be insulated with PVC tubing and formed in a low loop (approximately 75 mm) above ground level to allow for testing of the electrode. These loops must be easily accessible and enclosed in an inspection pit at locations shown on the drawings. If bonding to a driven electrode rod then suitable C-crimps or a U-bolt type clamp must be used to attach the flat strip to the round rod. If U-bolts are used then the connection must be kept clear of the soil.

Refer to the standard Ausgrid earth electrode drawing A3/130556 for further details.

(p) Earth conductor joints in the ground will be installed in covered pits where noted on the drawings to allow for the periodic inspection, testing and easy replacement of earth conductors if necessary.

As an alternative to the above voltage gradient control measures, the earthing system may be supplemented by a combination of equipotential bonding and high impedance layers. The following is an acceptable arrangement to comply with this option:

Concrete equipotential layers (100 mm minimum thickness) – touch voltage

High resistance asphalt layer (50 mm minimum compacted hot mix) – step voltage

This approach is to be undertaken for a radial distance of 1.5 metres around:

HV tower legs

any equipment cabins

portable generator pads.

The Telco must be responsible for maintaining all voltage control measures in good condition.

Telecommunication Equipment Earthing

(q) A coaxial cable earth bar must be installed below the gland plate on the Equipment Cabin external wall. The telecommunications cable gland plate (if metal) will also be bonded to this earth bar. This earth bar must have its own separate PVC insulated (70 mm2) copper earth bonding cable connected directly to the "cabin/tower earth grid" and mechanically, protected by

5 For example, “cad welding” or certain crimp connections (test reports required).

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galvanised steel conduit fixed to the Equipment Cabin wall. Below ground it will be protected against long-term corrosion by glued PVC conduit. The connection onto the earth grid will be either “cad-welded” or an approved crimp that is accessible in an inspection pit.

(r) On the HV tower another coaxial cable (tinned copper) earth bar will be positioned near the top of the conduit bends where the conduits swing away from the leg towards the cabin in order to keep the earth tails as short as possible. The conduits will be bonded to the earth bar. This bar is to be fixed to the HV tower leg and must have a separate 70 mm2 insulated copper earthing cable connected directly to the earthing point at the bottom of the HV tower leg. This cable will be installed in galvanised steel conduit mounted on the HV tower steelwork to minimise risk of damage due to impact.

(s) The isolation transformer enclosure must be bonded to the earthing system of the distribution board.

The earthing system design (relevant to the scope of the Telco’s work under this Standard) must be provided to Ausgrid, and Ausgrid may require Telco to confirm the touch and step voltage levels by a test method approved by Ausgrid at the completion of construction. Any testing must be at the Telco’s expense.

6.5 Cable Ladders External to Equipment Cabin All cable tray and ladder must be installed so that it is electrically continuous and bonded to the lightning protection earthing system, and provided with screw fixed proprietary covers.

The distance between fixings must not exceed the manufacturer’s recommendations.

All fixings must be hot dip galvanised unless noted otherwise.

Fixings used for the attachment of cable tray/ladder to HV towers and building structures must be hot dip galvanised metal thread screws, bolts or another method approved in writing by Ausgrid.

Protective covers must be provided to all cable trays installed in trafficable areas. Covers must be fixed down using full width clamp and bolt arrangement (Unistrut or approved equivalent).

6.6 Testing and Commissioning The Telco must provide all necessary instruments and plant for carrying out all tests during and on completion of the works.

The Telco must ensure that the installation is compliant with all of Ausgrid’s requirements and that test results and certificates are supplied to Ausgrid for approval prior to the submission of Notification of Electrical Works (NOEW).

Test and inspection results that Telco must supply include:

visual inspection for compliance with isolation bonding and installation requirements

insulation resistance (AS/NZS 3000:2000)

earthing system continuity

HV tower potential rise, touch and step voltages at critical points of the installation (unless high impedance layer method is used). The Telco will employ a specialist company approved by Ausgrid to carry out these tests at the completion of the works.

Test certificates must be provided to a nominated representative of Ausgrid. The electrical contractor will forward a copy of the “Notification of Electrical Work” to Telco immediately after it has been issued to Ausgrid’s Customer Supply division.

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Telco must then provide this copy to the Tower Works Co-ordinator. Ausgrid will issue a notice listing any defects.

6.7 Underground Cable Markers The Contractor must provide cable markers and orange electric marker tape to all underground cabling. Cable markers must be provided at each change of direction of underground cabling and at intervals not exceeding 25m on straight runs. Cable makers will consist of a prefabricated concrete pad with engraved stainless steel or brass plate. Refer accompanying drawings for details.

Orange electric marker tape must be installed 300 mm below finished ground level above all underground cable runs unless noted otherwise. Refer drawings for details.

6.8 Underground Services Underground conduits must be laid on a clean, fine particles sand bed and covered with a minimum 100 mm thick layer of sand prior to backfilling with clean fill. Backfilled trenches must be compacted and original surface reinstated or made good to the approval of Ausgrid.

6.9 Telstra Conduit Connection to the external telephone network must be by means of a suitable insulated or isolating system approved in writing by Ausgrid for each telecommunications installation, eg, fibre optic cable. Where optical fibre is used, it should be at least 10 metres long.

If the Telstra conduit and submains are installed in a common underground trench, then a minimum separation between conduits in accordance with AS3000:2000 and Austel requirements must be maintained.

All such conduit installations must be suitable for future drawing through of fibre optic cabling.

6.10 Ausgrid Power Shutdown and Access Procedure

6.10.1 Power Shutdown Procedure The Telco and Ausgrid must follow the access protocol conditions agreed between the parties, which must be in general accordance with Appendix C “Typical Access Protocol Conditions”.

The procedure to power down the Equipment Cabin must be clearly visible and located on the Isolation Panel. Refer to drawings for power down procedure signage.

If more than one Telco has a telecommunications installation on the same HV tower, then the power down procedure must specify the shut down of all antennae on the tower to ensure the safety of lineworkers climbing the tower.

The key requirement of the shut-down procedure is that if all voltmeters on the Isolation Panel indicate zero volts, then all power to transmitter equipment and the antenna installations on the HV tower is dead, and no antenna can emit any form of output.

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Appendix A - Typical Equipment Schedule

(sample only) EQUIPMENT SCHEDULE

Equipment Name Description

Generator plug power socket 50A, 3 phase, 5 Pin IP56 Male Plug

Manual Changeover Switch 63A, three position (MAINS-OFF-GEN), 3 pole (3 phase) 1P66 enclosure, switch locking provision

Transient Surge Protection Unit 40A, 40 kA, 3 phase + Neutral surge protection

Isolation Transformer 415V/415V-240V, 30 kVA, DYN 11 (Delta star)

Earthing Rods 15 mm diameter stainless steel or 25 x 3 mm copper strap or 70mm2 bare copper cable. Confirm with Ausgrid

Earthing Bars 50 x 5 mm thick tinned Copper

Copper Tape 25 x 3 mm

Galvanised steel tape Equivalent electrical conductivity to 25 x 3 mm copper strap

Cable Ducting 50 x 50 mm PVC with removable lid

Distribution Board 18 pole, 3 phase 100A busbar, 100A main switch

Air-conditioning Control/Security panel

Alarm status monitoring and air-conditioning control

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Appendix B - Training Requirements

Minimum Telco Staff and Contractor Site Induction (for HV Towers remote from Substations)

Prior to any employees, agents or contractors of the Telco commencing work on an HV tower, they must receive a site induction which covers all likely hazards associated with working on that site.

All work by these people must be at ground level, except in unusual circumstances, and so they must not, in general, work in close proximity to Ausgrid’s equipment.

The following are the minimum elements in any site induction. If a Hazard Assessment Check sheet (HAC) indicates other matters are of concern on the site, then they should also be covered in the site induction, eg, if Ausgrid’s cables or high pressure gas mains are in proximity of excavation work, then this must be addressed, and where necessary, appropriate training provided. The minimum elements in any site induction are:

risk of lightning or electrical faults at remote points along an HV tower line and the need to take adequate precautions

risks arising from remote earths and transferred potential

care in excavating near HV tower legs – note zone of influence in section 5.3.1 of this Standard

presence of HV tower earthing strips and electrodes – recognition, avoiding damage and need to notify Ausgrid’s Transmission section promptly if damage occurs

need to avoid damage to HV tower legs or members, and need to report damage immediately to the Tower Works Co-ordinator

ensure anti-climbing measures are always left in good condition and not inadvertently bypassed by civil works

review of any conditions for access to the site agreed between Ausgrid and the property owner (eg leaving gates open or closed, ensure cattle are moved to adjoining paddocks, etc)

care working at ground level when staff are working aloft (eg, risk of dropped tools, etc).

HV Tower and Telecommunications Installation Awareness All staff who climb HV towers with a telecommunications installation attached (including staff trained in tower rescue and contractors such as tower painters or riggers) must be aware of the nature of the equipment attached, and any additional precautions necessary, including the following matters:

identification of telecommunications equipment, including feeder cables

climbing with feeder cables attached to HV tower climbing leg

typical radiation patterns and Exclusion zones for antennae installed on HV tower.

the need to ensure all power to telecommunications installations is de-energised prior to working aloft

antennae must not to be used for attaching loads, including rescue lines, although attaching to the supporting steelwork of antennae is acceptable

care required to avoid damaging telecommunications installations, particularly antennae

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the need to sign an attendance register when working aloft on an HV tower with a telecommunications installation attached

the need to notify Telcos at least 24 hours prior to any emergency works requiring the de-energising of antennae

the need to advise the Supervisor as soon as possible after it is suspected that any person has been exposed to rf radiation, noting the proximity and duration of exposure.

Isolation procedures for de-energising Telecommunications Installations on HV Towers

Lineworkers who are required to work aloft on HV towers with telecommunications installations attached must be aware of the procedure for de-energising the installation to ensure antennae mounted to the HV tower stop emitting radiation prior to working aloft.

Training must include the following matters.

contact procedures with the Telco prior to the de-energisation of its telecommunications installation and once it is re-energised

operation of the Isolation Panel and the function of all switches and meters

operation of Isolation Panels when there is more than one Telco on an HV tower

the need to ensure power is disconnected from a telecommunications installation before commencing any work aloft.

Use of Radiation Detectors Before lineworkers commence work on aligning line of sight antennae, the Telco must provide radiation monitors to all lineworkers.

The Project Manager must:

(a) Ensure that lineworkers are fully aware of the operation of the monitor.

(b) Demonstrate to Ausgrid that each monitor is operating properly before work commences.

(c) Ensure that lineworkers understand the operation and response to alarms.

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Appendix C - Typical Access Protocol Conditions

Access to HV Towers by Ausgrid 1. Ausgrid must advise the Telco’s Network Management Centre (NMC) by

telephone on [XXXX XXXX] not less than 24 hours before requiring above ground access to an HV tower that is in the vicinity of the Telco’ antennae, except in the case of an emergency.

2. In the case of emergencies, Ausgrid must use its best efforts to advise the Telco’s NMC as soon as possible about the access required to an HV tower in the vicinity of the Telco’ antennae. Limited to the purpose of completing emergency work, Ausgrid may, as and when required, isolate all AC and DC supplies to any of the Telco’s telecommunications installations.

3. Ausgrid is not required to notify the Telco if it accesses an HV tower at ground level, eg for inspection of the tower foundation or earthing, or for a purpose that does not affect the Telco’s antennae.

4. If Ausgrid must advise the Telco’s NMC about accessing an HV tower under point 1 of this Appendix, then:

(a) Ausgrid must advise the NMC about the proposed date and duration of access.

(b) The Telco’s NMC must independently deactivate the telecommunications facility during the access periods agreed with Ausgrid.

(c) When Ausgrid’s personnel access an HV tower then must advise the Telco’s NMC before they:

isolate any AC or DC supplies to the Telco’s telecommunications installation;

restore any AC or DC supplies to the Telco’s telecommunications installation; and

depart the HV tower site.

5. Ausgrid’s personnel must complete the “Record of Attendance” located within the Equipment Cabin.

Access to Ausgrid’s HV Tower by the Telco 1. The Telco or its approved contractors must advise Ausgrid’s Network Control

Centre by telephone on (02) 96200621 not less than 1 hour prior to entering an HV tower site. The Telco’s access may be denied if Ausgrid has scheduled maintenance at the site.

2. The Telco or its approved contractors may only enter its Equipment Cabin and the immediate surrounding grounds, and the climbing of HV towers is strictly prohibited.

3. Access to HV towers is restricted to Ausgrid’s personnel and contractors, and the Telco or its approved contractors may supervise Ausgrid’s work regarding the Teco’s telecommunications installations. (Items 3-6 of Ausgrid’s Access protocols apply.)

4. The Telco or its approved contractors must advise Ausgrid’s Network Control Centre when departing an HV tower site.

5. The Telco’s personnel must complete the Record of Attendance located within the Equipment Cabin.

Ausgrid.

This document must not be reproduced in whole or in part or converted to machine readable form or stored in a computer or imaging system without the written permission of Ausgrid.

Revision History

Initial issue: 28/09/2004

Document Control

Authorised By: Craig Moody Date: 28 September 2004

Manager Network Engineering

Document Number: NS169

UNCONTROLLED COPY