lv board specs

Al Bayt Stadium Al Khor City Package-4 (Energy Centre Building) - Part 1 (Construction)

Tender No. SP/C/1612/14 Q11017-0100D-PK4-SRV-TD-SPC-EL-01-REV 0 S21 - of 21 © Copyright protected

SECTION 21 - ELECTRICAL WORKS PART 2 - LV The following clauses and/or parts delete, amend, supplement or are additional to clauses in QCS-Section 21 2.1 GENERAL 2.1.1 Scope Delete Sub-Clause 2.1.1-1 and replace with the following new Sub-Clause 1 This Part shall include all labour, materials and accessories for the complete performance

of the LV Cubicle Switchboards, Main Switchboards, Sub main Switchboards, Motor Control Centres, Distribution boards & the link, Meter panels, Motor Control Panels and Feeder Pillars in accordance with the specifications and drawings.

Delete Sub-Clause 2.1.1-2 Part 7 and replace with the following Part 7 Conduits and Conduit boxes Delete Sub-Clause 2.1.1-2 Part 8 Add Sub-Clause 2.1.1-2 Part 38 Part 38 Surge Protection for Low-Voltage Electrical Power. 2.1.3 References Delete the following in sub-clause 2.1.3-1 and replace by BS 5685 Electricity meters. BS EN 60051, IEC 60051 Direct acting indicating electrical measuring

instruments.

BS EN 60255 Measuring relays and protection equipment.

BS EN 60947-5, IEC 60947-5 Control devices. BS EN 62052, IEC 62052 Electricity metering equipment.

BS 6231 PVC insulated cables for switchgear. BS EN 61869-1, IEC 61869-1 Instrument transformers.

BS EN 60073 Basic and safety principles for main-machine interface, marking and identification coding principles for indicators and actuators.

BS 88, BS EN 60127 Cartridge fuses.



BS 159, BS EN 61439-6 Busbar and connection.

BS EN 61439, IEC 61439 Low voltage switchgear and control-gear assemblies.

BS EN 60947-4 IEC-1 & 1A Contactors. BS EN 60529, IEC 60529 Degree of protection of enclosures.

BS EN 60947-3, IEC 60947-3 Air break switches.

BS EN 60947-2, IEC 60947-2, BS EN 61439 Switchgear and Control gear.

BS 5472, BS EN 61439 Low voltage switchgear and control-gear. BS 7354, BS EN 61439,

BS EN 60947 Electrical power switchgear.

BS 3692 ISO metric precision hexagon bolts, screws and nuts. BS 7371 Coatings on metal fasteners.

BS 6121 Mechanical cable glands. BS EN ISO 1461 Hot dip galvanized coatings on fabricated iron and steel

articles. BS EN 10143 Continuously hot-dip coated steel sheet and strip

N.B. The above list is not exhaustive. All appropriate standards and regulations/codes covered under clauses 1.1.2 shall apply whether they are listed above or not. 2.1.4 Submissions Delete Sub-Clause 2.1.4-2-(b) and replace with the following new Sub-Clause (b) Complete verification approach, in accordance with IEC61439-1 to be carried out by

testing, calculation/measurement or satisfying design rules. Add the following to Sub-Clause 2.1.4-2

(d) Submit for approval detailed description of main distribution boards including all

logues, indicating compliance with the Standards specified under "Quality Assurance" Article, equipment characteristics, details of construction, operating data, dimensions and weights etc. Give details of miscellaneous items including incoming and outgoing feeder terminal arrangement, connections at busbars, isolating, earthing, interlocks, control devices, indicating and metering instruments etc. Boards are to be factory assembled and tested and shipped as complete package (s).

(e) Schedule of circuit breakers application, indicating type, range, features and

characteristics, short- circuit ratings, time-current curves etc. (f) Method of setting of protective devices for overload, short-circuit and earth-fault currents

as coordinated with upstream and downstream systems based on specific coordination



curves of protective devices used and specific calculated prospective short-circuit currents at various points.

(g) Test methods on site and references, including testing equipment for microprocessor

controlled trip units. (h) Details of base foundation for outdoor feeder pillars: Submit details to verify

clearances, spaces and installation of proposed equipment, prior to starting construction.

(i) Panelboard Schedules: For installation in panelboards submit final versions

after load balancing. Add the following new Sub-Clauses 2.1.4-3, 4, 5 and 6 3 Field Test Reports: Submit written test reports and include the following:

(a) Test procedures used. (b) Test results that comply with requirements. (c) Results of failed tests and corrective action taken to achieve test results that

comply with requirements. 4

5 Updated mimic-bus diagram reflecting field changes after final main distribution board

load connections have been made, for record.

6 Maintenance Data: For main distribution boards and components to include in maintenance manuals specified in Division 1. In addition to requirements specified in Division 1 include the following:

(a) Routine maintenance requirements for main distribution boards and all installed

components. (b)

protective devices. (c) Time-current curves, including selectable ranges for each type of overcurrent

protective device. 2.1.5 Quality Assurance Delete Sub-Clause 2.1.5-1 and replace with the following new Sub-Clause 1 All Assemblies are to be manufactured by international manufacturers. Local

manufacturers must be listed as approved by QGEWC and holding a certificate of approved panel assembler from the original international manufacturers. Manufacturers must have a previous record of satisfactory service in Qatar for at least 3 years.

Delete Sub-Clause 2.1.5-2 and replace with the following new Sub-Clause



1 All Motor Control Centres shall be subject to routine rests to detect faults and

workmanship in accordance with BS EN 61439. Standard assemblies and/or products

who supplied the produ

Add to Sub-Clause 2.1.5-2 the following (l) Inspection trips to be held in the factories for all assemblies . Delete Sub-Clause 2.1.5-2-(g, i & j) and replace with the following new Sub-Clause (g) Motor Control Centres shall be subjected to dielectric tests as described in BS EN 61439

clause 10.9.2. All electrical components of the assembly shall be connected for the test, excluding those designed for lower test voltage and currents e.g. measuring instruments.

(i) The protective measures with regard to protection against direct and indirect contact shall

be checked as per BS EN 61439 clause 8.4.3 (j) For Motor Control Centres, complete verification approach, in accordance with

IEC61439-1 to be carried out by testing, calculation/measurement or satisfying design rules.

Delete Sub-Clause 2.1.5-2-(k) Add the following new Sub-Clause 2.1.6: 2.1.6 Coordination Study 1 Contractor to submit a coordination study along with setting of protective devices for

overload, short-circuit and earth-fault currents as coordinated with upstream and downstream systems based on specific coordination curves of protective devices used and specific calculated prospective short-circuit currents at various points. The coordination shall be fully detailed to show the short circuit currents at each FBA location. The study shall show that the protective devices provided do ensure the proper protection and coordination. Any breakers not satisfying the study shall be replaced by proper ones to ensure proper system operation. The coordination study has to be associated with a coordination study for earth fault currents through out the system to ensure proper selection of earth fault setting for all breakers to ensure discrimination and proper protection of all system components.

Add the following new Sub-Clauses 2.1.7; 2.1.8; and 2.1.9: 2.1.7 Warranty 1 Manufacturers Warranty: Submit a written warranty signed by the manufacturer

agreeing to repair, restore or replace any defective equipment specified in this section during the specified warranty period

(a) Warranty Period: Minimum 400 days from date of substantial completion.



2.1.8 Extra Materials 1 y

(a) One set of fixed and moving contacts for every type of replaceable (consumable) contact set.

(b) One operating motor and/or coil for each type of electrically operated circuit breaker.

(c) Two sets of each type of indicating lights, fuses, LEDs, control switches, and similar devices subject to failure or breakage at any time.

2 Tools and Instruments: Provide tools and instruments required for normal routine

inspection and maintenance and testing of circuit breakers and protective devices as appropriate for type of switchgear supplied.

2.2 PRODUCTS Add the following new clause 2.2.0 General 1 All main, sub-main, and final branch distribution boards in addition to MCC/MCPs, that

are located in sprinklered rooms, shall be provided with drip shields or made sprinkler-proof by some equivalent means. Final adopted method shall be submitted for

ipment. 2 Surge protection devices shall be provided at boards in accordance with BS EN62305

Standard and QGEWC Specifications and as detailed under Specification Section 21,

2.2.1 Cubicle Switchboards In Sub-ClausSub-Clause 2.2.1-1(h) and 2.2.1-1(i) Delete Sub-Clause 2.2.1-1-(b) and replace with the following new Sub-Clause (b) The switchboards shall be fabricated, assembled, wired, checked, tested and co-ordinated

at the factory by one manufacturer using the same make for all internal switchgear components and shall be constructed in accordance with BS EN 61439.

(u) The clearances and creepage distances in the MCCs shall be based on rated impulse

withstand voltage in accordance with BS EN 61439-1 to ensure that the equipment designed is capable of withstanding the specified voltage without failure under specified test conditions.



Add to Sub-Clause 2.2.1-1 the following (y) Generally: Main distribution boards shall be dead-front type, metal enclosed, multi-

cubicle, floor mounted, free standing, with 1000V rated insulation voltage, and 600 V rated operational voltage, with fully withdrawable and motorized main breaker and fixed outgoing breakers sections, manually or manually and electrically operated, as shown on the Drawings, with matching vertical sections to form a continuous integral and rigid structure. All components are to be suitably rated for continuous operation at 50 deg. C (122 deg. F).

(z) Coordinate with Building Management System (BMS) manufacturer and provide all necessary interfaces, relays, transducers, RS232, Ethernet connection, etc, with cabling, necessary for the functions specified in the BMS schedules and/or shown on the Drawings.

(aaa) Meters where provided shall be compatible and capable of connection to BMS. Coordinate with BMS manufacturer for proper interfacing.

Add to Sub-Clause 2.2.1-2 the following (ppp) Rigidly framed and bolted, with electro-galvanized sheet steel enclosures, minimum

thickness as specified under 2.2.1-2.c above, phosphatized, primed with rust inhibiting primer and finished with thermal polymerized polyester epoxy powder coating, grey colour (RAL 7032) from outside and inside with white colour, to approval. Switchgear is to be vermin, dust and rodent proof, IP42 protection to IEC 60529 for indoor installations and IP55 protection for outdoor installations or installations in wet areas, with adequate lifting means and base frames and capable of being moved into position and directly bolted to floor without additional sills.

(qqq) Main Distribution Board Type: Switchboard(s) are to be of the following type(s):

i. Form 4, type 6 to IEC 61439 and in accordance with QGEWC requirements.

ii. Accessibility: Front and rear accessible.

iii. Alignment: Front and rear aligned.

iv. Incoming breaker: Withdrawable, motorized power air circuit breaker (PACB).

v. Outgoing breakers: Fixed MCCB type, unless otherwise indicated on the drawings. Access to the internal components of any compartments must be feasible by isolating its particular switch. The hinged doors shall be mechanical; interlocked with the switch in such a manner that the door can be

All breakers with frame above 630 A shall be ACB type.

(rrr) The switchgear shall be provided with suitable cable glands to suit the type, size and

number of cables as indicated on the drawings.



(sss) Ventilation: Compartments are to be ventilated, by approved methods complying with the Standards.

(ttt) Main distribution boards are to have a short circuit withstand current greater than

the prospective fault level at the location and for a minimum of 3 sec, and for a minimum of 44 kA for 3 sec and as stipulated in QGEWC regulations. All boards shall comply with IEC 61641 for internal arcs. Breakers for MDBs are specified under Section 21 Part 3 .

(uuu) All ACBs to be category B. The whole installation to be fully rated for prospective

fault at the location and selectively coordinated. (vvv) Fastenings between structural members are to be bolted. (www) Extension of structure and busbars is to be possible at either end of switchboard.

The electrical installation is to be fully rated for prospective faults at the location and selectively coordinated.

(xxx) Arrangement is to permit incoming and outgoing busbars and cables to enter

enclosure as indicated on the Drawings and connect at respective terminals without inconvenience to installation or maintenance.

(yyy) Removing Circuit Breakers: Suitable arrangements and equipment are to be

provided for extracting, lifting and unloading switchgear from enclosures as appropriate for type of switchgear.

(zzz) Spare Position shall be fully equipped enclosure with switchgear. Space position

shall be fully equipped enclosure ready to receive switchgear. (aaaa) Main incomer shall be provided with surge protectors as per QGEWC specification. (bbbb) Fully withdrawable metal enclosed circuit breaker section is to consist of

compartmented unit(s), stationary part with rear busbar and cable connection compartments and front draw-out circuit breaker assembly. Partitions between sections are to be bolted steel plate and partitions between compartments are to be tough solid insulating removable bolted barriers. Each unit is to have hinged lockable front door with grip-handle and door mounted instrumentation. Shutters to be provided to ensure full protection against live contact.

(cccc) Drawout circuit breaker assembly is to have disconnecting contacts, wheels and

interlocks to prevent connecting or disconnecting circuit breaker unless in the open position, and to prevent closing circuit breaker while racking into any of the three positions (connect, test, disconnect). Racking mechanism and rail assembly are to be approved worm and lever mechanism. It is to be possible to close the unit door with breaker in any of the three positions and when removed. External position indicator is to be provided. Fixed disconnecting primary contacts are to be accessible and replaceable from front and are to be silver plated copper. Moving primary disconnect contacts are to consist of self-aligning, silver plated, spring pressure, finger-cluster, copper contact fitted on line and load studs of circuit breaker.



(ddd) Main circuit breaker section is to individually accommodate main circuit breaker,

main cable entry with terminal fitting assembly and metering compartment. Where placed against a wall, accessibility is to be possible from front and sides or only from front of section.

(eee) Pull Sections: An additional cable pull section is to be provided, depending on

(fff) Where busway is used as an incoming or outgoing feeder of the switch board

manufacturer shall provide all necessary accessories as recommended by the busway manufacturer such as adaptor box for the switchboards to be able to accept the busway flange. The contractor is responsible for coordination between the two manufacturers

(ggg) Front and rear accessible, front and rear aligned, individually mounted fixed MCCB

distribution sections as basic construction for Form 4 switchboards, are to be compartmentalized construction, consisting of front modular circuit breaker compartments, busbar system compartments and rear cable termination compartments (as per the form type selected), with insulating barriers between front compartments and busbar compartments and between rear compartments and busbar compartment (removable for maintenance). MCCBs are to be closely coupled to busbars (to minimize chances of bus-side faults), and to rear cable terminals, through compatibly frame-sized insulated connectors. MCCB modules are to be covered on the front, by recessed frame-type bolted covers, 1.5 mm minimum thickness, to protect circuit breaker handles. Top, sides and rear are to be covered with removable screw-on plates having formed edges all around.

(hhh) The MDB shall be provided with power factor correction as shown on the drawings

to achieve QGEWC regulation requirements. (iii) All main distribution boards shall be equipped with combined class I + II surge

-voltage ith their fused-disconnect switch shall be

Delete Sub-Clause 2.2.1-3-(a) and replace with the following new Sub-Clause (a) Provide identification on all equipment e.g. control panels, MCC, controllers, raceways,

boxes and conductors, devices etc in accordance with BS EN 81346, BS EN 61666, BS EN 61175 and BS EN 60445 standards or latest edition of other applicable standards to the approval of the Engineer.

Add to Sub-Clause 2.2.1-4 the following (o) Control Wiring: Finely stranded copper conductor, silicon rubber insulated cables are to

be used in proximity to higher temperature components and as flexible cable. All control wiring shall be neatly bunched and wrapped in PVC spiral wrap with flexible connection.



(p) Ferrules: Wires are to be fitted with numbered ferrules of approved type at each termination.

(q) All control wiring shall be terminated in approved quality control terminals from reputed

international manufacturers. Terminals shall be screwed type tinned copper. Blocks shall be with halogen free non-corrosive, self-extinguishing type material suitable for high temperature as per IEC 60216.

Delete Sub-Clause 2.2.1-7-(a) and replace with the following new Sub-Clause: (a) Busbars shall be sized to the main circuit breaker frame size derated for 50 deg. C (122

deg. F) indoor ambient, and braced for a symmetrical rms short circuit duty equal to or higher than main circuit breaker interrupting duty, for a minimum of 3 seconds. Busbars are to be tinned copper hard drawn, high conductivity 99.9% purity, suitably sleeved for phase identification to BS 158. It shall be of sufficient size to limit temperature rise to allowable insulation or equipment temperature ratings, and to maximum 40 deg. C (104 deg. F) above average ambient temperature of 50 deg. C (122 deg. F) outside enclosure. Connections and buswork are to be bolted with copper alloy hardware and are to be accessible for inspection and maintenance. Contact surfaces are to be electro-silver plated. Tinning of busbars to be done after cutting/punching/drilling.

Add to Sub-Clause 2.2.1-7 the following: (s) Connections from busbar to switchgear are to be rated to carry full continuous current

rating of switchgear frame and are to be insulated. (t) Full size neutral is to be continuous through all sections. Neutral bus is to be insulated

and separate from earth bus. (u) Earth bus is to extend full length of board, firmly fixed to each section in accordance with

the Regulations and Standards, complete with 2 main earthing lugs (1 at each end), and required number of feeder protective earth connectors.

Delete Sub-Clause 2.2.1-8 (a) (i) Point 7 and replace by the following:

Three ammeters shall be provided to read the current of each phase.

Add to Sub-Clause 2.2.1-8 (a) the following

(ii) Main functional display unit (MFDU)

Provide a main functional display unit (MFDU) to provide readings similar to those mentioned above in (i). Ensure a communication link with the BMS. Delete Sub-Clause 2.2.1-8-(b) (v) and replace with the following new Sub-Clause (v) Current transformers shall comply with BS EN 61869-2 and IEC 61869-2and should be

suitably rated and designed to carry out the appropriate function as indicated. Add to Sub-Clause 2.2.1-8 (c) (vii)the following new Sub-Clause



(c) Digital kilowatt watt hour meter (as specified by digital meter manufacturer and approved

by the engineer/client) Add to Sub-Clause 2.2.1-8 the following Sub-Clause: (e) Addressable Communication Card is to be provided, capable of communicating all data

specified under (a), (b), (c) and (d), monitoring and control, with the BMS system as described in detail hereafter

(f) The switchboard electronic meters shall be microprocessor based and shall have a data

port to enable the exchange of data between the Management Level Network and the meter. Meters shall monitor all incomers of all MDBs. Additionally there shall be hardwired interfaces between the BMS and the low voltage distribution boards as detailed below.

(g) The interface between the meter and the Management Level Network shall enable, at

minimum, the following information to be transferred from the meter to the Management Level network:

i. RMS Current per phase. ii. RMS Voltage phase-to-phase and phase-to-neutral.

iii. Current demand. iv. Peak current. v. Watt-hours, three phase total.

vi. Watts per phase and three-phase total. vii. KVA per phase and three-phase total.

viii. Watt demand. ix. KVA demand. x. KVAR per phase and three-phase total.

xi. KVAR demand. xii. Power factor per phase and three-phase total.

xiii. Power factor average. xiv. Peak readings for watts, KVA and KVAR. xv. KVARH Lag.

xvi. KVARH Lead. xvii. Frequency.

xviii. Any other information available from the metering system as selected by the Employer.

2.2.2 MOTOR CONTROL CENTERS (MCC) Add to Sub-Clause 2.2.2-1 the following



(f) Unless specified otherwise in the Project Documentation, MCCs shall be constructed to comply with the requirements of IEC 61439 Form 4 Type 3 and conform to GAMBICA Association standards.

(g) MCCs shall be designed, manufactured and tested to IP55 protection in compliance with the requirements of IEC 60529, with dip proof top protection.

(h) MCCs shall be designed and type tested to withstand a fault current of 44 kA for 3 seconds symmetrical as a minimum, and should withstand the fault current at the point of application if larger than the above figure. Additionally the MCCs shall be type tested for safe containment of an internal arcing fault, and establish that the enclosure of MCCs together with internal partitions and/or barriers withstands the pressure and temperature arising from internal arcing with short circuit current and thus provides protection for persons in front of or within the close proximity of the MCCs in the event of internal arcing.

(i) Test certificates must show that the neutral bar has been tested with the full fault current and for the full time specified.

(j) MCCs shall be designed to operate satisfactorily in an ambient air temperature of +50° C and RH exceeding 90%.

(k) Unless otherwise specified temperature up to +70° C and RH up to 100% shall apply during transport, storage and installation. Equipment subjected to these extreme service conditions without being operated shall not suffer irreversible damage when operated under normal specified conditions.

(l) The temperature rise in MCCs shall not be allowed to damage the components, connectors, wires, terminals etc. With the equipment in normal service condition, no live part shall become subjected to high temperature causing overheating that increases the risk of internal arcing accidents.

(m) Extreme care shall be taken while designing the MCCs to ensure external surface temperature is maintained within the specified limits.

(n) The clearances and creepage distances in the MCCs shall be based on rated impulse withstand voltage in accordance with BS EN 61439-1 to ensure that the equipment designed is capable of withstanding the specified voltage without failure under specified test conditions.

(o) The equipped MCC must confirm to the clearance and creepage distances and withstand voltages explicitly by taking into account the specified service conditions.

(p) The maximum height of assemblies shall be 2400 mm above the finished floor level. (q) Site consideration including safety and maintenance shall be taken into account in the

design of assemblies. These considerations shall include:

(i) Clear floor space of at least 900 mm shall be provided in front of the MCC from the free edge of the doors in the open position.

(ii) In order to provide an unobstructed exit route a clear path of not less than 900 mm shall be provided at each end of the MCC.

(iii) Provision of sufficient space to allow for doors to open fully without fouling other items of equipment or other open doors.

(iv) Limiting the size and weight of assembly sections to those imposed by transportation, site access and permitted levels of site floor loading.



(r) All cubicles shall be provided with a means of ensuring that equipment can be adequately isolated for maintenance purposes without interrupting essential loads which may continue to operate whilst maintenance is being undertaken.

(s) Doors and covers giving access to potentially live conductors shall be provided with prominent warning labels, in English and Arabic.

(t) No components shall be located within the assembly at a height greater than 2000 mm or less than 500 mm above finished floor level.

(u) It shall be possible to replace and maintain any component without first removing other components.

(v) Unless specified otherwise control supplies shall be 110V a.c. derived from a transformer within each compartment fused on its primary circuit. Neutral shall be earthed with a removable link. Transformer shall be rated for at least 150% of the maximum loading for long service life.

(w) Each compartment shall be provided with a separately fixed compartment heater rated 110 Volts AC. Apart from those in motor starter compartments the heaters shall be

means of adjustable panel mounted humidistat covering the range of humidity envisaged. \

(x) Wiring: Motor control center in compliance with NEMA standards shall be class II, factory wired with type B wiring to NEMA ICS-18. The same shall be implemented to motor control centers in compliance with IEC standard.

(y) MCCs shall be designed for ready extension at each end.

(z) All cable entries shall be affected using brass cable glands to IP rating as specified. (aa) All cable glands shall be provided with earth tags.

(bb) Contractor shall provide proper interface with BMS as required in the mechanical specifications and/or shown on drawings. Contractor to coordinate with BMS provider for proper interface.

(cc) All motor control centers fed directly from transformer shall be equipped with Class

Low-Volt -disconnect

(dd) All motor control centers fed from MDB shall be equipped with Class II surge protective devices as specified under -

-disconnect switch

Delete clause 2.2.3 and replace with the following new clause 2.2.3 Sub-Main Distribution Boards

1 Type: General purpose type or industrial suitable for relevant ambient conditions, flush



self-standing and or surface mounted as shown on the drawings, comprising box, trim, or trim and door to approved manufacturer's standards and sizes. Enclosure shall be subjected to 1000-hour salt spread test.

2 SMDBs shall be manufactured to BS EN 61439-1, factory assembled and certified by an authorising testing body.

3 Construction: Box, trim and doors, where required, are to be electro-galvanized sheet steel of gages not less than specified and in accordance with the standards. Welded joints are to be galvanized after manufacture. Gutter spaces are to conform to the standards, adequate for the utilized cables/wires subject to thin no case less than 100 mm on all sides. Enclosure is to have pre-designed angles or threaded end studs to support and adjust mounting of interior panelboard assembly.

4 Trims are to cover and overlap front shield, covering all terminals and bus compartments, to form a dead front panel. Trims are to be fixed to cabinet/box by quarter-turn clamps engaging flange of box (use of screws engaging holes in flange of box is not acceptable). Screws where used are to be oval-head, countersunk and flush. Trims for flush mounted panelboards are to overlap box and front shields by at least 20 mm. Trims for surface mounted panelboards are to be exactly sized to form flush fit to box.

5 Doors are to have concealed hinges integral with trim, and flush combination cylinder lock and catch. Doors over 1000 mm high are to have vault-type handle and multiple point latch mechanism. Locks are to be keyed alike.

6 Hinged Front Panels: Allow access to breaker, metering, accessory, and blank compartments, maximum demand indicators (MDI) on incomer.

7 Finish: Inner and outer surfaces of cabinet/boxes, trims, doors etc. are to be cleaned, phosphatized, chrome passivated and treated with final thermosetting epoxy powder modified by polyester resins providing high resistance to mechanical injury, heat, acid and alkali solvents, grease, aging and corrosion and of standard grey RAL 7032 outside and white inside colour to the approval of the Engineer.

8 Directories under glassine, or an approved alternative durable arrangement, are to be provided on inside face of doors, or in metal label holders when trim without doors are specified. Directories are to be typed to identify panelboards and clearly indicate circuit number and description of load.

9 Outdoor enclosures are to be heavy duty double walled aluminium cabinets, minimum 1.5 mm thick, fully weatherproofed (IP 55), without knockouts, but with removable sealed/gasketed bottom gland plates and gasketed doors.

10 Glands: Cable glands used for armoured cables are to be of brass compression type, complying with BS 6121 and BS EN 50262: Part 1, with earth tag and PVC shroud.

11 Operating dollies of all circuit breakers/isolators to be door interlocked and it shall be possible to defeat the interlock by means of a tool.

12 Busbars



(a) Type: One piece, 98 percent pure electrolytic high conductivity copper, tinned, based on total maximum operating temperature of 90 deg. C (194 deg. F) at any point of the bus, at full continuous rating. Bolted or clamped contact surfaces are to have maximum current density not exceeding requirements of the approved standards. Aluminium is not to be used for busbars or panelboard parts.

(b) Design: Shrouded/insulated and rigidly designed so that branch circuit devices can be removed without disturbing adjacent units or changed without additional machining, drilling or tapping. Busing is to be full size without reduction. Busing and blank plates are to allow installation of future circuit devices, where indicated

oles vertical busbars/risers.

(c) Rating: At least equal to main-circuit breaker frame size. Where no main circuit breaker is required, busbars are to have main lugs or disconnect switch, with nominal rating equal to standard circuit breaker frame sizes, and as shown on the Drawings.

(d) Unless otherwise stated in the particular specification or drawings, the short circuit duty shall be minimum 25 kA for 3 sec. and it shall also carry at least 125 percent of the maximum short circuit level at point of application for 3 seconds, without showing any signs of degradation.

13 Terminals and connections are to be anti-turn, solder-less screw-pressure type. Screws and bolts used for making copper/copper connections are to be hard copper alloy with lock washers (riveted bus connections are not acceptable).

14 Neutral bar is to be solid fully rated and fully insulated from cabinet or box. One solder-less box type set-screw connector is to be provided for neutral wire of each branch circuit and one bolted clamp-type connector or anti-turn lug with set-screw for main incoming neutral wire. Neutral is to be fully sized and rated as for phase busbars.

15 Earthing bar is to be copper on the full length switch board, brazed to panelboard cabinet, with bolted pressure connector for main conductor and 1 set screw-type tunnel terminal for each outgoing conductor, to provide secure and reliable contact with all metal parts and enclosure.

16 Neutral bar is to be sized as the phase bus bars. Earthing bar is to be half size the phase busbars. Protection is to be fully rated throughout the systems.

17 Three ammeters with dead pointer to indicate the maximum reading and one 0-500 Volt voltmeter with Off/ph-ph/ph-N selector switch, for incoming supply.

18 All breakers shall be of the MCCB type except for those of frame above 630A which shall be of the ACB type.

19 All MCCB of rating 100 Amps and above shall have adjustable thermal and magnetic facilities.

20 DP TYPE 1: to be form 2b to IEC 61439-1, and have a rated insulation voltage of 750 V a.c., 240 V d.c., surface mounted to wall or free standing , with doors (unless otherwise shown on the Drawings), suitable for ratings of main breaker and busbars ranging from 630 A to 1250 A, 3-phase, 4-wire (or 3-wire where specifically indicated),



suitably and orderly arranged for any selected combination of branch MCCBs ranging from 150/160 A to 1250 A frame size and short-circuit interrupting ratings as shown on the Drawings. Circuit breakers smaller than 250 A frame size, where indicated, may be grouped on an integral sub-assembly mounted to main chassis.

21 DP TYPE 2: to be Form 1 to IEC 61439-1, and have a rated insulation voltage of 690V, Panelboard is to be recessed or surface mounted type, as shown on the Drawings, complete with trim and door, adjustable trim fixation for flush panels, and with ratings of main circuit breaker or switch and busbars up to 400 A, 3-phase, 4-wire, with 2 or 3-pole branch circuit breakers, 100 A or 150/160 A or 250 A frame size.

22 Construction: Sheet steel, minimum 1.5 mm thick for cabinet/box and minimum 2 mm thick for trim or trim and door. Fronts are to be single or twin covers to shield circuit breakers, terminals and live ends.

23 Interior of panelboard is to be pan assembly consisting of galvanized sheet steel chassis minimum 2 mm thick, folded, flanged and reinforced, with busbars vertically arranged and mounted on molded insulators.

24 Molded insulators are to have minimum temperature rating of 130 deg C and insulation grade of 3.5 kV for one minute.

25 Circuit breakers are to be mounted in twin arrangement (except for larger circuit breakers) and bolted rigidly to copper cross and center bus connectors.

26 All distribution panelboards shall be equipped with Class II surge protective devices as specified under Part 38 Section "Surge Protection for Low-Voltage Electrical Power Circuits". SPDs along with their fused-disconnect switch shall be integrated within or

Delete clause 2.2.4 and replace with the following new clause 2.2.4 Final Branch Panelboards Distribution Boards (DB) - Type MCB

1 Arrangement: Comprise set of homogeneous branch circuit breakers with unified profile and base, and one main circuit breaker or switch as shown on drawings. Single and multi-pole circuit breakers or other devices are to occupy modular spaces. Accommodation of contactors and split-bus arrangement or other devices is not to change regularity of standard box width.

2 Indoor Enclosure: Sheet steel, minimum 1.0 mm thick for box/cabinet and minimum 1.5 mm thick for front shield, trim and door. Fixings for flush trim are to be adjustable to allow for mis-alignment between box and wall surface. Wiring spaces (gutters) are to be at least 100 mm wide. Larger gutters are to be provided where tap-off insulated split connectors are required. Knockouts are to be provided in top or bottom of enclosures and are to provide a neat and uniform conduit/cable terminal arrangement.

3 Type: Rated insulation voltage rating of 690V

4 Internal Assembly: to comprise removable back plate or back pan of rigid construction, attached to enclosure by four captive screws through keyhole fixings, and provided with



busbars in horizontal arrangement for SPN panels and in vertical arrangement for TPN panels. Assembly is to be complete with neutral terminal block, earthing bar and one-piece insulated phase busbar. Busbars are to be single-phase or 3-phase with spade connectors for fixing by tightening a single screw on circuit breaker. Insulation is to be high thermal rating, capable of carrying maximum short-circuit current for one second without overheating beyond acceptable limits required by the Standards.

5 SPN type panelboards are to be suitable for 240V maximum service voltage, single- (or Molded Case

Switch (MCS) on main incoming as shown on the drawings) of the miniature type.

6 SPN type main circuit breaker or isolator is to be double-pole, as shown on the Schedules.

7 Single-pole and double-pole MCB s for 240 V service, are to have trip ratings between 6 A and 50 A, with ICs as required in the Schedules.

8 TPN type panelboards are to be suitable for up to 415 V A.C. maximum service voltage, 3 phase and neutral, with on branch circuits and 3 or 4 pole MCS main incoming, as specified or shown on the Drawings.

9 Triple pole branch circuit breakers are to have trip ratings between 6 A and 100 A, with IC as required in the Schedules.

10 TPN type panelboard main incoming is to be MCS, with/without RCD as shown on the Drawings.

11 Panelboards are to be protected against earth fault current, in addition to over current and short circuit protection, on each outgoing circuit, in accordance with the Regulations.

12 All panels shall comply with IEC 60641 for internal arcs (minimum time to be specified by Consultants).

13 All final branch circuits feeding sensitive electronic equipment such as: electronic equipment and telecom racks shall be equipped with class III surge protective devices as specified under Part 38 Section "Surge Protection for Low-Voltage Electrical Power Circuits". SPDs along with their fused-disconnect switch shall be integrated within the

14 Unless other wise stated in the particular specification or drawings, all final Branch Panel Boards (MCB type) shall be rated for a short circuit rating of 10 KA and type test certificate furnished.

Add the following Clause 2.2.5 Meter Panel 1 Multi metering three phase IP43 IK 09 house service metering board. Tanks are GRP made composed of 3 modules as follows:



(a) Power meter module ready for installation of 3 units of three phase power

Meters each (405 x 202 x 630 mm) [WxLxD] with transparent sealable cover made in U.V resistant polycarbonate.

(b) One auxiliary module (270 x 171 x 630 mm) [WxLxD] intended to house: The auxiliary fuse cut out, suitable for 10x38 cartridges.

(c) A set of wall mounting accessories. The enclosure is to be installed indoor

and on wall. Add the following Clause 2.2.6 Motor Control Panels (MCP)

1 MCP Type shall be wall mounted or floor mounted, lockable type, Form 2b to IEC 61439-1. MCPs shall be designed, manufactured and tested to IP54 in compliance with the requirements of IEC 60529, with dip proof top protection

2 MCP construction shall employ a minimum of 1.5 mm thick hot-dip galvanised steel sheet, finished with one coat etch primer and one coat stove enamel applied internally and externally.

.

3 Components: Motor control panel shall include the following: i. Main incoming circuit breaker or isolating switch as shown on the Drawings

for terminating incoming supply cables and isolating the busbar system. ii. Copper main and branch busbars.

iii. Neutral copper busbar rated at half capacity of main busbar. iv. Earth copper busbars rated at half capacity of main busbar. v. Digital multimeter unit with necessary current transformers at incoming

vi. Starters, circuit breakers, push buttons, indicating lights, switches, relays,

contactors and accessories as shown on the Drawings. vii. Interconnecting and interlock wiring.

4 Wiring: Motor control panel in compliance with NEMA standards shall be class II, factory wired with type B wiring to NEMA ICS-18. The same shall be implemented to motor control panels in compliance with IEC standard

5 Starters, switches, electrical devices and accessories are to be clearly labelled as to function and number. Labels are to be permanently fixed under each component.

6 Schematic and wiring diagrams are to be mounted in a permanent & approved manner on inside of panel door. Diagrams are to show each component cross referenced with component labels.

7 MCPs shall be designed to operate satisfactorily in an ambient air temperature of +50° C and RH exceeding 90%.



8 Unless otherwise specified temperature up to +70° C and RH up to 100% shall apply during transport, storage and installation. Equipment subjected to these extreme service conditions without being operated shall not suffer irreversible damage when operated under normal specified conditions.

9 The temperature rise in MCPs shall not be allowed to damage the components, connectors, wires, terminals etc. With the equipment in normal service condition, no live part shall become subjected to high temperature causing overheating that increases the risk of internal arcing accidents.

10 All cable entries shall be affected using brass cable glands to IP rating as specified.

11 All cable glands shall be provided with earth tags.

12 All motor control panels shall be equipped with Class II surge protective devices as -Voltage Electrical Power

-disconnect switch shall be integrated within or

13 Contractor shall provide proper interface with BMS as required in the mechanical specifications and/or shown on drawings. Contractor to coordinate with BMS provider for proper interface.

Add the following Clause 2.2.7 Feeder Pillars

1 Description: this work shall consist of supplying, complete with the necessary base, mounting, testing and putting into satisfactory operation of feeder pillars which shall generally be used to feed electrical lighting and other installations as required.

2 Construction: the feeder pillar shall be totally enclosed fully self-contained dust-proof, weather proof and suitable for mounting outdoors exposed to dust, rain and sunlight. The enclosure shall have a minimum rating of IP55.

3 Cabinets: shall be reinforced free standing structure, manufactured from 3 mm nominal thickness steel with bolted reinforcement corner construction and shall be of the dwarf type with a bolting down root for mounting on a pre-formed concrete base suitable for all incoming and outgoing cables from below ground level in a duct system. Cabinets shall have two hinged lockable opening doors to provide full front access to the cabinet. The cabinet shall be sized according to the equipment being installed. The roof of the cabinet shall be slanted and shall have water drip edges.

4 Characteristics: the feeder pillar shall be complete with all equipment and fittings as shown on the drawings.

5 Contactors: shall be triple-pole, inductive type, rating shall be as shown on the drawings and in compliance with the specifications.

6 Timers: are to be electronic timer (Quartz) type. The timer shall be capable to operate without interruption in case of power supply failure for at least 500 hrs.



7 Busbars: are to be fully insulated, rated at least 1.25 times the main incoming moulded case circuit breakers frame size at 50 deg. C.

8 Feeder pillars shall have the following characteristics: a. Voltage: 1000 Volts b. Moulded Case Circuit Breakers (MCCB): Triple-pole equipped with overload

and short circuit trip mechanisms, in compliance with (IEC 60947-2 sequence III), and rated as shown on the drawings

c. Interrupting Capacity: 18 kA minimum or 1.25 times the short circuit level at the point of application (whichever is greater), unless otherwise shown on the drawings

9 Feeder Pillar is to equipped with the following: (a) Three ammeters each fitted with maximum demand indicator with associated

current transformers. (b) Voltmeter with selector switch. (c) ON/OFF/Manual selector switch (d) Photo electric cell operated contactor (e) Timer (standby) (f) Current transformer and accessories with a glass window to be mounted on

the feeder pillar inside special enclosure to power company specifications and approval.

(g) All other components and switching function to permit intended operations

10 Internal Cabling: to be PVC/PVC single core 1000 volt grade with copper conductors and rated as required taking into account manufacturers recommended temperature and "bunching" derating factors. All internal wiring shall be suitably "laced" or clipped.

11 Control: the LV panel circuits serving the street lighting shall be supplied through triple pole contactors which shall be photo-electric controlled. An over-ride facility shall be provided for maintenance. The photo-electric controls shall consist of an omni-directional cadmium cell thermal relay of high quality employing solid state photo-variable conductance elements giving a 2:1 on/off ratio with sensitivity to switch on lights when the daylight illumination reduces to 70 lux. The cell shall be pole mounted at a height of three meters and fitted to the top of the feeder pillar. A standby electric clock operated timer and a manually operated change-over switch, shall also be provided to permit standby operation.

12 Permanently fixed to the Inside of the door there shall be a distribution diagram showing all circuit connections, cable sizes and references, etc.

13 Feeder Pillars: shall have a 50mm x 6 mm high conductivity copper main earth bar for grounding purposes complete with test link (see "earthing section"). Also, permanently fixed to the inside of the door there shall be a distribution diagram showing all circuit connections, MCCB ratings, cable sizes and references, etc.

14 Feeder Pillar: shall be secured against unauthorized access by means of wedge locks protected by brass plugs and operated by a special key to be agreed with the Engineer or as applied by the local authority. The final finish and final colour of the pillar shall be to the approval of the Engineer.



15 Contractor shall provide proper interface with BMS as required. Contractor to coordinate with BMS provider for proper interface.

16 Metering Instruments: (a) Instruments shall be housed in enameled, square, metal cases for flush installation.

Scales and markings shall be protected and sealed. Accuracy of instruments shall be within 2% unless otherwise specified.

(b) Voltmeters shall be the moving iron type, with center zero adjuster, range 1.25 times nominal system voltage, 90 degree angle, size 76 x 76 mm.

(c) Voltmeter selector switch shall be 7-position rotary type. (d) Ammeters shall be moving iron type, with center zero adjuster, range 2 times

nominal circuit amperage, 90 degree angle, size 76 x 76 mm. (e) Ammeter selector switch shall be 4-position rotary type. (f) Current transformer shall be of the indoor dry type, rated secondary current 5 A.

Rated primary current, core size and accuracy shall be determined in accordance with nominal current of plant protected, short-circuit level and burden.

(g) Voltage transformer (VT) shall be provided where required, complete with primary and secondary fuses and disconnecting device.

17 Wiring shall comply with the following:

(a) Wiring shall be modularly and neatly arranged on master terminal boards with suitable numbering strips and appropriate cartridge type fuses where required. Connections shall be made at front of terminal board and with no live metal exposed.

(b) Metal cases of instruments, control switches, relays etc. shall be connected, by bare copper conductors not less than 2.5 mm² section, to nearest earthing bar.

(c) Control wiring shall be copper, PVC insulated, 85 deg. C, 600 V grade, and PVC sheathed for multi-core cables. Finely stranded copper conductor, silicon rubber insulated cables shall be used in proximity to higher temperature components and as flexible cable.

(d) Wires shall be fitted with numbered ferrules of approved type at each termination.

18 Anti-condensation heaters with disconnect switch and pilot lamp shall be provided in switchboard, controlled by thermostat and/or humidistat where this is required by Local Authorities.

19 Schematic and wiring diagram shall be provided suitably located within each cubicle 2.2.8 Manufacturers

Approved Manufacturers: Subject to compliance with requirements, provide products by one of the following or approved equal:

1. ABB (Switzerland/Sweden) 2. Moller (Germany/EU) 3. Eaton-MEM (UK/USA/EU) 4. Merlin Gerin/Schneider Electric (France) 5. Siemens (Germany) 6. Schneider Electric / Square D (U.S.A)



Add to sub-clause 2.3.1 the following 5 Feeder pillar foundations are to be of reinforced concrete, as approved by the Engineer

contractor). Dimensions, levels and surface finishes are to be suitable for equipment installed as shown on details drawings and in accordance with approved shop and construction drawings.

END OF PART 2

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