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NPS Sluice gates remote control

APPENDIX C - SOW/TOR TECHNICAL SPECIFICATION AND REQUIREMENTS

USER REQUIREMENTS

NPS SLUICE GATES REMOTE CONTROL.

(REF: RTO: 414699)

NPS Sluice gates remote control 2

1. INTRODUCTION

Eskom Uganda Limited (EUL) is a wholly owned subsidiary of Eskom Enterprises SOC Limited of

South Africa, and is a limited liability company in Uganda. EUL is operating and maintaining both

Nalubaale Power Station (NPS) and Kiira power stations (KPS). Eskom Uganda Limited took over

the operation and maintenance of the two power stations on a 20 year concession and assignment

agreement, commencing on 1 April 2003. The Uganda Electricity and Generation Company Limited

remains the owner of the asset.

The Nalubaale Power Station forms the barrier that controls the discharge from Lake Victoria. As

part of the application of Best Practice with regard to dam safety, gated sluice ways were designed

into the complex as a way of ensuring flood control to maintain structural integrity of the dam in turn

mitigating risks to dam safety. These sluices are low level with a capacity of 1,200m3/sec.

Proper operation of these sluices is therefore very important as a way of ensuring dam safety given

that failure to operate them in a timely manner could have devastating effects. Remote operation of

those gates as opposed to current practice of local operation shall ensure quick response to

emergency situations as described in the emergency preparedness plan and it is for that reason that

remote operation is strongly recommended.

This document shall address the users’ need putting into perspective what is required.

2. BACKGROUND

The original design of the sluice gates incorporated their remote operation to ease that work but

currently, those gates are operated in local mode. The reason for local operation is that the control

cable that span from the gates to the control room was vandalised and from then on, the remote

operation has not been restored.

Remote operation of the gates should be reinstated because, in the event of an emergency that

would require the operation of those sluice gates as a corrective measure, local operation could be

too slow as one would have to make the trip to the gates yet remote operation available in the control

room would ensure quicker response to that situation.

EUL intends to reinstate remote operation to mitigate risks associated with local control of the gates.

3. OBJECTIVES

The objectives of this project is to restore the original design functionality of the remote control

system. The restoration of this remote control system shall mitigate the risk of slow response to an

emergency situation requiring timely control of the sluice gates.


4. DESIGN CONDITIONS

4.1 Control Room

The panels and associated components should be able to operate effectively in dusty

environment given the control room susceptibility to dust.

The indoor nature of the environment reduces the probability of contact with rain water. There

is air conditioning in the control room that runs the whole day every day.

4.2 At the sluice gates from where local control is executed

The outdoor nature of the panels makes the susceptible to dust, corrosiveness, rain fall and

ambient environment temperatures. The panels and associated components to be installed

shall take this into consideration.

5. DELIVERABLES

Following the successful completion of works, the contractor shall be expected to provide the

following documentation;

The contractor shall submit the financial and technical bids as separate documents. One

original and two duplicate copies of each of the bids provided.

The contractor shall produce a clear, concise and comprehensive design specifications

documents addressing the key elements.

Components specifications to include standards, codes, operational maintenance,

installation, performance and testing specifications documents.

The contractor shall provide all details to manage quality control plans for the installation,

implementation and installation sequence. The resource plan clearly indicating client

interventions, verification and testing plans for the installation prior to operation.

The contractor shall provide all necessary details and procedures to detail testing and

commissioning procedures.

The contractor shall provide sufficient details to scope the O&M procedure and check sheets,

as built drawings, training manuals not forgetting critical spares list.

The contractor shall provide adequate training to operations, maintenance and engineering

personnel. This shall be quoted for in the price schedule.

The contractor shall provide warranty that system components used are of latest technology

and shall not become obsolete for 15 years period from the time of installation of the system.

The contractor shall provide a 12 months warranty for the system.


6. DESCRIPTION OF EXISTING SYSTEM

Local control of the sluice gates is the only present form of operation of the sluice gates. Control of

the sluice gates from control room is non-functional. The sluice gate characteristics are shown below;

Table 1: Features of the sluice gates

Parameter

Opening width 2.991metres

Opening height 5.099metres

Opening speed 1 metre per minute

Closing speed 3 metres per minute

Normal lift height 5.30 metres

Maintenance lift height 5.40 metres

Sill level 1111.910 metres

Operation is by hydraulic cylinder with hydraulic oil complying with ISO VG 32.

Gates weigh 18,322kgs with ballast

Hydraulic pump rated for 43 litres per minute and producing 100 bars to lift the gate

Pumps are run by duplex 11kW motors with direct on line starter. These pumps have a

section at the Main control panel from where they are controlled. Pump control shall be

designed with an interlock system to avoid control of the pumps simultaneously at

both remote and local stations

Position Monitor Assembly - Rotary limit switch potentiometer- Telemecanique XR2-AB10

size 10 Penny & Giles HRP18/1S/350/5K Ohms. This assembly is currently faulty and shall

need to be replaced by the contractor.

Local control can be achieved from either the main panel or any of the six local control panels.

Selection of control from either the main control panel or any of the six local control panels is done

at the main panel via six keyed switches with one for each of the six gates.

NB: The characteristics stated in Table 1 MUST not be altered by the new system installed.

Mains supply to the pumps and control section is isolated when the system is not in use and

then energized when gate operation is required.

The valves cutting off oil supply from the pumps are closed when operation is not needed

however, on commissioning of the system, those valves shall be kept open to ensure that the

gates are operated remotely without having to move to the local site to operate the valves

first.

6.1 Main Control Panel

The main control panel is designed with a control section from which either of the six gates can be


controlled. The operator can either close fully, lower the gate to a given level, raise the gate to a

given level, stop the gate motion or open the gate fully and these control functions apply to any of

the selected gates at this panel. The panel is described below;

Figure 1: Main control panel

Figure 2: Control section showing Gate controls clearly labelled as shown


Figure 3: Lower part of the Main control panel

Protection- BS 5490 IP 55

Electrical power supply- 415V 3 phase 50Hz

6.1.1 Control Section components used

Digital Indicator- Amplicon Type 84

Indicator lamps- Square D D1V10

Push button selectors- Square D D1A1U

3 position selector switch- Square D



Fused switch- Stromberg OESA 32G1

Transmitter- Amplex AMT240

Fuse 1 Amp- GEC

Fuse 2 Amp- GEC

Fuse 10 Amp- GEC

Relays- MTE 4N8

Timer- MTE 4N8

Thermostat – RS 339-291

Heater- Eldon ACH 100-110V 100W

Transformer- Amber 415/110V 1KVA

6.1.2 Control Section description

The main control panel section is powered from the 415V 3 phase electrical circuit from the incoming

section. All control and indication circuits operate 110V from an integral 415/110V transformer.

The control compartment is arranged with 6 identical gate control and indication groups and a set of

common controls and indication for all gates. The lower section of the panel incorporates some of

the following common controls and indications:-


Door interlocked fused isolator switch

Operation of this switch makes or breaks the 415V electrical supply circuit to the transformer.

Gate selection six position switch

Operation of this switch selects the corresponding gate control and indication circuit and

inhibits all others.

Lamp test push button

Operation of this push button completes a circuit to energize a lamp test relay. This enables

testing of bulb integrity.

Digital Indicator (Gate position)

With the gate on the sill, the indicator reads zero. On raising the gate, the indicator shows

gate height in metres.

Open indicator lamp (red)

Illuminates to indicate that the gate is fully open.

In transit/Intermediate (amber)

Illuminates to indicate that the gate is either in transit or has stopped in an intermediate

position.

Closed Indicator lamp (green)

Illuminates to indicate that gate is fully closed.

Raise push button (black)

Operation of this push button selects the gate to raise (open).

Stop push button (red)

Operation of this push button stops gate traveling either direction.

Lower push button (black)

Operation of this push button selects the gate to lower (close).

Control Available indicator lamp (white)

Illuminates to indicate that gate control is available from this group of controls.

Main panel/Gate under maintenance/local panel keyed switch

Either control point can be selected by turning the key to desired control point. The control

points are explained below;

1. Main panel selection enables the gate to be operated from the respective group of

controls on the main control panel.

2. Local panel selection inhibits main panel operation and enables gate operation from

the local control panel.

3. Gate under maintenance selection energises a maintenance relay which illuminates

the gate under maintenance indication on the respective local control panel. Contacts


within the relay complete a circuit to by-pass the gate open limit switch. Control panel

and the gate may be raised above the open position to the maintenance position.

6.1.3 Pump control section

As shown in Figure 2, the Main panel is vertically divided into two with the left side used for pump

control and the right side used as the control section.

On the left is three segments with pump1control, pump2 control and incoming supplies arranged

vertically respectively from top to bottom;

Each pump shall have an ammeter availed to monitor load current. These pumps shall also

have indication for number of hours run by each pump.

Each pump shall have mode selection among three modes “MANUAL, OFF and AUTO”

mode.

Lamp test shall be possible for this pump.

There shall be a green start and red stop buttons for those operations. The pumps shall also

be availed with an indication lamp to show whether the pump is running or not.

The pump control panel shall have indications for overload as well as indication for earth

fault.

Reset buttons for both overload and earth fault conditions shall be availed. These should

work only after the fault has been cleared.

The pump control panel shall have a voltmeter for incoming power supplies to the pumps

with a selector switch to measure voltage across either phase or ground including provision

to select voltage measurement between any two of the phases of power.

These panels shall be painted with “nach RAL 7040-Fenstergrau” shade of paint.

Figure 4: Pump 1 controls and this is identical to pump 2 controls


Figure 5: Incoming supplies segment of the pump control section

6.2 Local Control Panel

There are six local control panels with one set up for control for only one of the gates. For example,

gate 1 can only be controlled by the control panel set up for it and no other panel.

Selection for the use of the local control panel is done using the keyed switch at the main control

panel.

In the event that one wants to operate gate 1, the keyed switch at the main panel control section of

gate 1 is turned to local panel thus enabling operation of gate 1 from its local panel and this applicable

to the other five gates. This key can select among main panel, gate under maintenance or local

panel.

On selecting to use the local control panel, one at the control panel can raise, open fully, lower, stop

motion or close fully the gate when operating.

Figure 6: Local panels (orange) for the sluice gates


Figure 7: Gate 3 local panel front view

Figure 8: Control functionality at gate 3 local panel. The rest of the local panels are identical to this.

6.3 Contract Drawings

The contract drawings related to the existing system are listed below and shall be provided by EUL

to the contractors.

Table 2: Contract Drawings

Identification Number Purpose

06090408 General arrangement-main control panel

06090410 Power distribution schematic-main control

panel

06090411 Pump 1 and 2 schematic-main control panel

06090412 Motor control and gate position-schematic


06090413 Gate 1 and gate 2 control-schematic

06090414 Gate 3 and gate 4 control-schematic

06090415 Gate 5 and gate 6 control- schematic

06090416 Control gates electrical system

7. METHODOLOGY

The contractor shall decommission the existing system components both in the NPS control

room and at the local site.

The contractor is required to design, install, test, commission and handover project related

documents like drawings and operator and maintenance manuals.

The contractor shall also train operations, maintenance and engineering personnel on the

installed system.

8. SCOPE OF WORK

8.1 General

Design, supply, install, test and commission the remote control system.

The contractor shall also do onsite training for the operations, maintenance and engineering

team. Representatives from each of those departments shall be selected by EUL.

The contractor shall provide all relevant drawings, manuals for operating and maintenance

including commissioning documents in sets of three and one soft copy.

The contractor shall also provide a list of critical spares to maintain under inventory.

As part of design, the contractor shall design an interlock that allows for control at either the

local point or at the control room.

NB: IF OPERATION AT BOTH PANELS FAILS, THE GATE CAN BE OPERATED

MANUALLY THROUGH VALVES NEAR THE LOCAL CONTROL PANEL WITH THE

DOWNSTREAM VALVE UTILIZED FOR OPENING WHILE UPSTREAM VALVE IS UTILIZED

FOR CLOSING THEREFORE, THIS MANUAL SYSTEM SHALL NOT BE TAMPERED WITH

DURING THE PROJECT WORKS AND ITS FUNCTIONALITY SHALL NOT BE INTERFERED

WITH BY THE NEW SYSTEM EVEN AFTER COMMISSIONING. AFTER COMMISSIONING

OF THE NEW SYSTEM, THIS FUNCTIONALITY SHALL BE TESTED TO ENSURE IT IS STILL

INTACT.


8.2 Site visit

1) The contractor may visit and examine the site and its surroundings to obtain for themselves

all information that may be necessary for preparing the tender and entering into a contract.

The costs of visiting the site shall be the contractor’s own responsibility.

2) The contractor may visit the site and get acquainted with the actual requirements of site prior

to quoting rates and should quote for all that he knows will lead to the project’s success.

3) During the site visit:

a) A representative of EUL will be available to meet the intending contractors at site

b) Contractors must provide their own transport and accommodation where necessary

c) All clarifications shall be made on the same day

4) The contractor is advised to send qualified and experienced technical representatives to

observe all requirements on site in order to come up with a working proposal for the works.

8.3 Control Room

This is where the remote control is expected to be carried out from and the following functions shall

be expected to be in place. Images of the control room are shared in the Appendix A.1.

Gate selection among either of the six available gates shall be possible at the panel in the

control room.

The operator should be able to select either pump to run in order to operate a sluice gate.

The second pump is a stand by pump such that it kicks in to help the duty pump in the event

that the duty pump needs support.

The operator should be able to start or stop the pump in operation and there shall be an

indication lamp showing whether the pump has been started or stopped.

The operator should be able to raise a gate and an indication lamp (red colour) must be

availed to show that the gate is being raised.

The operator should be able to lower a gate and an indication lamp (green colour) must be

availed to show that the gate is being lowered.

Both the raise and lower buttons shall be black in colour.

The operator should be able to stop the gate motion irrespective of the direction in which it is

moving. An indication lamp must be availed to show that the gate motion has been stopped.

The stop push button shall be red in colour.

The operator should be able to tell by how much in metres a given gate is open.

The operator should be able to tell when the gate is in motion/transit via a yellow lit indication

lamp.

Fully open and fully closed indications for each of the six gates must also be made available

at the panel.


A lamp test push button shall be made available in order to test the functionality of the lamps

availed at the panel.

These panels shall be painted with “nach RAL 7040-Fenstergrau” color paint.

Before any installations are done, the existing components left behind from the original

remote system shall be decommissioned and disposed off with EUL guidance. Figures of the

components to be disposed off are shared in the appendix.

The position indicators shown in figure and their associated wiring are the components

present and they shall be decommissioned.

The contractor shall install the components of the remote control system necessary in the

control room to ensure its execution from there.

8.4 At the sluice gates/local panels

Local control shall be possible at either the Main control panel or the local control panel. Selection

of either shall be made possible for each of the gates via a keyed switch.

8.4.1 Main Control Panel

Selection between either remote or local control via a keyed switch or its equivalent.

If local control is chosen, Main panel, Gate under maintenance or local panel keyed switch

should be further used to choose which local mode among these as availed by the keyed

switch. These modes are explained in 6.1.2 and there operation MUST be maintained with

the new system.

Selection among either of the six gates.

The operator controlling from that point should be able to raise or lower that selected gate.

Both the raise and lower buttons shall be black in colour.

The operator at this panel should be able to know that the gate is either open or closed via

red and green indication lamps respectively.

The operator shall be able to know by how much in meters that the gate under control is

open.

The operator shall be able to stop the motion of the gate using a red stop button.

The operator shall be able to know whether control supply is available for this specific gate

via a white lit indication lamp.

The operator shall be able to test the lamps via a black lamp test button.

The operator shall be able to know whether oil level is low via an orange lit indication lamp.

The panel shall have a “duty pump fail pressure” indication when the required pressure to

raise the gates is not met.

The operator shall be able to reset the duty pump in the event that the “duty pump fail

pressure” alarm on it is responded to and the situation is normalized.


These panels shall be painted with “nach RAL 7040-Fenstergrau” colour paint.

As shown in the figures for the Main control panel under section 6.1, all those controls shall

be made available in the new system.

8.4.2 Local Control Panels

The operator shall be able to raise the gate via a black button and a red lit indication lamp

shall be availed to show the open status.

The operator shall be able to lower the gate via a black button and a green lit indication lamp

shall be availed to show the closed status when fully closed.

A yellow lit indication lamp shall be availed to show when the gate is in transit either during

raising or lowering operation.

A green lit indication lamp shall be availed to show when the “GATE UNDER

MAINTENANCE” is selected as provided as a mode on the main panel.

The operator at this panel shall be able to know by how much the gate is opened in metres

via a gate position indicator.

These panels shall be painted “nach RAL 1017-Safrangelb” colour of paint.

As shown in figures under section 6.2, those available controls shall be maintained in the

new system as well.

8.4.3 Signal relaying cables

Multi core PVC shielded 600/1000V cables shall be employed to relay signals from the control

room to the sluice gates. The cables shall be 600m long.

Spare cores accounting for 10% of the cores to be used shall be accounted for within the

multi core cable.

The analogue signals from 4-20mA position transducers to the position indicators at the

remote point (control room) shall be transmitted via multi core twisted pair cable. 600m is the

distance from the sluice gates to the control room.

The cables shall cross the road from below it to avoid interrupting traffic flow to lay cables.

It shall then run along the bridge up to the power house from where it will enter.

It shall then run along a cable tray in the cable duct. The cable duct has 11kVAC cables

running within it.

It shall enter the control room through the floor to the panels from where remote control shall

be placed.

The cable route that shall be taken from the local panels to the control room is shown in the

Appendix A.3 with photos.


8.4.4 Panels

The panels at the local control point shall be of BS 5490 IP 55 due to the exposure to all weather

conditions outdoor. The panels that shall be in the control room may have less IP rating for liquids

given reduced probability of interaction with liquids.

When cables pass through holes in the panels, edges of the holes shall be protected by means of

grommets to prevent damage to insulation.

8.4.5 Labelling

1) All panels/cubicles and all front mounted equipment as well as equipment mounted inside

the panels shall be provided with individual labels with equipment designation engraved for

identification. The labels shall be mounted directly above the respective equipment with

English description.

2) The device name/number shall correspond to the Name/Number used in the drawings. All

panel devices shall also be provided tag numbers corresponding to the ones shown in the

panel internal wiring drawing to facilitate each tracing of wiring.

3) These labels shall be mounted directly by the side of the respective equipment and shall not

be hidden by the equipment wiring.

8.4.6 Decommissioning of existing equipment

The existing panels and associated components at the local control point shall be

decommissioned and replaced with new ones. Eskom Uganda Limited shall guide on how

the panels shall be disposed.

The digital position indicators still present in the control room and associated wiring shall be

decommissioned and disposed. Refer to figures 14 and 15 of Appendix A.1.

The motors, pumps and other mechanical parts of the system shall be left intact thus NOT

interfered with.

The gate position transducers and transmitters are faulty and as such shall be replaced to

ensure that the operators know the level of opening or closing of the gates.

9. PROJECT PERSONNEL

The contractor shall demonstrate that he/she MUST have personnel for the key project positions that

meet the following requirements as indicated below;

Table 3: Project Personnel

Person Similar experience of similar

remote control systems.

Years of experience with

remote control systems.

Design

engineer/Commissioning

engineer

Registered with a

recognized engineers

regulatory body.

≥10 Years


Provide CV indicating

his/her specialty in

designing similar

remote control systems

of at least 3 similar

works.

Site Engineer Registered with a

recognized engineers

regulatory body.

Provide CV indicating

his/her work done

during implementation

of at least 3 similar

remote control

systems.

≥5 Years

Technicians/electricians who

will perform

Provide CV indicating work

done with implementation of

similar remote control systems.

≥5 years

Safety officer Provide CV ≥3 years

Note: Contractor to provide proof of project personnel’s experience with similar works.

10. SAFETY, HEALTH, ENVIRONMENT AND QUALITY ASSURANCE

General Safety Requirements

All contractors personnel shall be equipped with protective gear.

The contractor shall provide a safety policy, health, environment and quality management

plan.

The contractor shall provide a warranty that the material and workmanship is defect free and

will operate as indicated in the technical proposal.

All contractors’ personnel shall be subjected to a site specific safety induction lasting the first

day of mobilization to site.

The contractor and their personnel shall comply with the local safety policy.

Work shall be executed in compliance to the provisions of Eskom Uganda Limited plant safety

regulations.


11. SPARE PARTS

The contractor shall recommend critical spares to be part of inventory as this will ensure quick system

restoration in the event of failure of a component.

12. DOCUMENTATION

12.1 Drawings

Drawings shall show the layout of equipment, identification of units and sub units within a cubicle

and the essential mechanical features of all racks, cubicles, units and sub units.

Overall dimensions and masses shall also be shown.

Installation drawings shall show details of fixing, mounting, altitude, cable and entries together with

any components or devices required in handling and installing.

All relevant dimensions and masses shall be shown. Drawings shall be provided in both hard and

soft copies. Three hard copy drawings and two soft copy drawings with one of the soft copies in CAD

and the other in PDF. English must be the language of use in the drawings.

12.2 Operations and Maintenance

Highlight any safety precautions to be taken during the installation, testing and commissioning. A

maintenance procedure for the system shall be provided.

No single fault should cause multiple failures on the system.

12.3 Manuals

All relevant manuals, diagrams, instructions shall be delivered in both hard and soft copy with three

hard copies of each provided. One soft copy provided in PDF. English must be the language used

in the manuals.

The manual shall describe the following as a minimum;

Procedure of operation.

Illustrate mounting, adjustment, operation and disassembly of each component.

Maintenance period of each component shall be included.

Provide spare parts identification, typical problems for each part and recommended solutions.

12.4 Binding

The documents provided shall be KEBA ERGO bound.


13. TRANSPORTATION AND HANDLING AT SITE

Transportation and erection of the equipment will be borne by the contractor. Contractor will be

responsible for any damage to the panels and inside components that may result from transportation

and handling at site.

14. INSTALLATION AND COMMISSIONING

The contractor shall deliver all equipment, tools and material required for the successful installation

of the sluice gate remote control system.

The contractor shall perform panel positioning, installation, testing and commissioning of the installed

system.

15. TRAINING

The training shall cover installation, testing, operation and maintenance. Training shall be done at

operations and maintenance level where engineers shall be present.

16. REQUIREMENTS

16.1 Submission Requirements

To be considered responsive, the contractor must;

The contractor shall submit the technical and financial bids as separate documents. One

original and two duplicate copies for each of the financial and technical bids shall be

submitted including one soft copy for each of the bids.

Provide qualifications, years of experience for the project personnel as shown in section 9.

All tools, testing equipment required for the successful execution of the project has to be

arranged by the contractor

Any damaged parts as a result of testing will be replaced by the contractor without additional

charge to EUL.

Cost of any delay caused by the contractor during delivery will be covered by the supplier.

Submit proof of having carried out similar assignments for reputable organisations.

Submit references with contact information from organisations that have used the

contractors’ services for similar works in the last 10 years. Minimum of 3 references.

All other additional information which contractors may require in order to ensure a successful

execution of this project will be provided on request.

List names of proposed professional service team and describe each members service role.


16.2 Site Requirements

16.2.1 Existing/Prevailing site conditions

The plant is fully operational and is intended to keep it operational during the course of

the implementation of the project.

The successful contractor is intended to co-operate with other users of the power station

during project implementation stage.

Neither lunch nor water provisions for Contractors.

Contractor shall meet their own transport during the course of the project.

Contractor shall meet their own accommodation.

16.2.2 General site requirements

Access to site is 08:00hrs to 17:00hrs Monday to Thursday and15:00 on Fridays. Except the

last Friday of the month when normal work ends at 12:30. Extensions to these times are

negotiable.

Extra work hours should be communicated before execution.

Lunch break starts at 13:00hrs to 14:00hrs.

Contractor and personnel shall be identifiable on site using eligible forms of Identification

documents (IDs, Name badges) and/or uniforms.

All persons on site shall be subject to Eskom Uganda Limited policies and safety regulations.

Copies of safety regulations are available on request.

The contractors’ team shall be subject to normal access procedure.

17. APPENDIX

A.1 The control room

Figure 9: View 1


Figure 10: View 2

Figure 11: View 3

Figure 12: View 4


Figure 13: View 5

Figure 14: Digital Indicators to be decommissioned

Figure 15: Digital indicators wiring at the back of the panel


A.2 Control Panels

Figure 16: Main control panel Enclosure. Pumps are housed in the right half and the control panel in the left half.

Figure 17: Pumps

Figure 18: View 1 of the Main panel


Figure 19: Main Control Panel interior 1

Figure 20: Main control panel interior 2


Figure 21: Local panel interior

Figure 22: Pump 1 control panel. It is identical to pump 2 control panel.

A.3 Signal relaying Path

The photos shown below serve the purpose to give a picture of how the cables shall run from the

local point to the remote point.


Figure 23: Getting below the surface to pass the cable under the road

Figure 24: Path through which cable shall cross the bridge from under

Figure 25: Exit point of cable after crossing the bridge


Figure 26: Path along which cable shall run to the power house

Figure 27: Cable path to power house after crossing the bridge

Figure 28: Cable entry into powerhouse from running along the bridge


Figure 29: Dropping onto a cable tray in the cable duct

Figure 30: Cable path through the cable duct

Figure 31: From cable duct to cable squad through the wall like the other cables shown


Figure 32: From cable squad to control room through the floor like these shown cables.

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