lv cable laying.doc

7/27/2019 LV CABLE LAYING.doc

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METHOD STATEMENT FOR LV CABLE LAYING AND ALLIED WORKS

METHOD STATEMENT

LV CABLE LAYING & ALLIEDWORKS


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TABLE OF CONTENTS

1.0 SCOPE OF WORK

2.0 DUTIES & RESPONSIBILITIES

3.0 PROCEDURAL STEPS

4.0 RESOURCES & SCHEDULE

5.0 QUALITY CONTROL

6.0 HEALTH, SAFETY AND ENVIRONMENT

7.0 REFERENCES


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1.0 SCOPE OF WORK

The purpose of this Method Statement is to set guidelines and methodology to be

followed while performing the Cable Laying and Allied Construction activities onproject

2.0 DUTIES AND RESPONSIBILITIES

2.1 Project Manager (of client) shall be responsible for overall construction activities on site.

2.2 Project Engineer has the responsibility for monitoring the cable laying and allied workactivities, ensure that the works are performed according to the approved drawings and

procedures and shall coordinate the activities with the Contractors representative

ensuring Request for Inspection (RFI) are performed and signed off.

2.3 QA/QC Engineer is responsible for the necessary quality control implementation on site.He shall monitor and follow up the compliance of client/Consultant specifications

according to the scope of work.

2.4 Site Engineer shall supervise and monitor the site implementation in coordination withProject Engineer and he shall prepare the necessary site reports.

2.5 Safety Officer shall be responsible for developing, implementing, and monitoring differentsite safety activities. He shall be responsible for Induction Talk and relevant awareness

programs on site.

2.6 Visual Inspection of materials shall be carried out at Warehouse/Yard. ThoroughInspection of consumables materials shall be scheduled according to work progress and

materials specifications. Any defect shall be reported to concerned person prior to the

transportation to the site.

2.7 Final As Built and closed out documents shall be submitted by the to theclient/Consultant as required.

3.0 PROCEDURAL STEPS

3.1 Preliminary Survey and Route Approval

3.1.1 Obtain service reservation details and existing services drawings from the Concerned

Authorities in coordination with the Client/Consultant according to the scope of work.

3.1.2 Survey shall be carried out on the proposed route to obtain cable length, final cable

route and to determine the feasibility or further proceedings.

3.1.3 The detailed route survey report shall be submitted to the Client/Consultant including

discrepancy or obstructions for the further clarifications and necessary instructions and

approval.

3.1.4 A detailed work execution program for the aforesaid work shall be submitted indicating

intended period/time of execution and agreed with the Client.


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3.1.5 Notice of intent shall be submitted to the Client/concerned authorities at least one week

ahead of the schedule program.

3.1.6 shall obey all relevant rules as applied by the Traffic Department with

reference to the traffic sign, diversions, etc., during the performance of our work.

3.1.7 According to the scope of work shall be responsible for obtaining from theconcerned authorities any latest and correct information and details regarding the final

levels, road center lines, reserves for cable and other services and any other work in

connection with his work.

3.1.8 All necessary approvals from different authorities shall be arranged by the

in coordination with Client/Consultant according to the Scope of work.

3.2 Trail Pit and Excavation Procedures

3.2.1 Prior to start of any excavation, the area shall be checked for existing services/ Utilitiesby obtaining the approvals and relevant drawings. All services/obstruction discovered

and shall be reported to the main contractor

3.2.2 Before proceeding with all the site activities NOCs / Permit to Work and other necessary approvals

from all concerned authorities shall be secured for the whole cable route.

3.2.3 The necessary excavation activities shall start only after getting the Notice of intent and

approvals from the concerned dept/ Client/ Consultant

3.2.4 Excavation for trial pits shall be proceeding manually as per the size indicated in the

approved drawings up to the required level and length.

3.2.5 In open area, excavation shall be proceeding by using machineries. The exact location of

each trench and pit shall be subject to the approval of the Client/ Consultant.

3.2.6 Manual excavation will be carried out to expose the existing utilities if any, which has to

be identified. While doing the trench excavation, it shall not be less than 1.5m deep, 2.5m Wideand perfect compaction shall be executed up to 95%.

3.2.7 It shall ensure that no more than 1,200 meters of excavated trench is kept open at any

time and a watchman shall be provided for every 600 m. of open trench.

3.2.8 The trenches shall be kept dry during cable installation operation. shalldeal with and dispose of water so as to prevent any risk to the cables and other

materials.

3.2.9 shall provide suitable dewatering methods while performing the works

according to the scope of work. The selection of machineries and Methods shall decide

according the approvals/Permission from clients/Consultants.

3.2.10 The required control measures shall be develop and implement while performing the

works and more importance will be given for public safety and environmental issues.

3.2.11 The necessary safety barricades and warning signs/ lights shall be provided/ fixed on site

according to the company policy and Local regulation requirements.

3.2.12 While performing the work, the trenches shall be straight, free from any sharp material /

edges likely to injure the cable or accessories and filled with soft and sieved sand to form


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smooth bedding before the cables are laid

3.2.13 - EPD shall take all the necessary precautions to prevent damage to the

road or ground surface due to a slip or breaking-way from the side walls of the trench

including the pedestrian safety also

3.2.14 The vehicle entry shall be restricted on specified work area by the prior approval fromconcerned agencies/ Government Firms.

3.2.15 Where ever the cross of existing services/ Utilities shall be protected with the utmost

care with the prior permission of concerned authorities and approved methods.

EPD shall obtain the necessary approvals from the

client/Consultant/Concerned Authorities according to the scope of work.

3.3 CABLE LAYING

3.3.1. Cables shall be laid directly in the ground with protection covers, drawn into pipes and

ducts, laid directly in troughs or in concrete trenches, or on racks, or supported on trays

or cleats as may be required by the Engineer.

3.3.2. A drawing must be provided which will show the cross section of cable trench of single /

double circuit. The cable trench for single circuit shall be as under: 40 cm wide at bottom

and 80 cm deep for LV Cable; and 50 cm wide at bottom and 100 cm deep for 11 KV

Cable.

3.3.3. The cable shall be laid straight in the centre of the trench. Where more than one cable

are laid in the same trench, the distance between the adjacent power cables shall not be

less than 40 cm between centre.

3.3.4. The width of cable trench shall be increased accordingly for each additional circuit.

3.3.5. The trench shall be filled with a 10 cm. layer of sieved soft sand before the cables are

laid

3.3.6. A uniform compact layer of 10 cm. of soft sieved sand shall be built over the cable before

placing the protective cable covering slab. The slab shall be laid lengthwise on the cable

in such a way that the cable is in centre of the slab.

3.3.7. The trench shall be then back filled carefully. The first layer of back fill shall be placed

manually and compacted by hand punning until a thickness of 150 mm. over the cable

cover tiles is reached.

3.3.8. A warning tape shall then be laid. The subsequent layers of soft sand may be placed and

compacted with mechanical equipment. Consolidation should be obtained by compaction

in layers of 150 mm. thickness.

3.3.9. At the terminations, cables are to be laid with just sufficient length for proper termination

with minimum of cable wastage. Wastage in excess of half a meter at any termination

will be charged to the .

3.3.10.At the joint location, cables are to be laid with their Ends over lapping for a length not

exceeding one meter.

3.3.11.Any excess length will be charged to the . Cables should as far as possible

laid direct from the drums. When pulling through trench, cable rollers shall be placed at

the bottom spaced as close as possible to avoid abrasion to the cable serving.


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3.3.12.When pulling through ducts, all necessary care and attention should be exercised to

avoid injury to the cable end or serving.

3.3.13.Bending radii shall be as large as possible. The minimum shall be not less than 20 D

along the route and 12 D adjacent to Joints and Terminations CD' - being the overall

diameter of the cable.

3.4 CABLE PULLING

3.4.1 Inspection of cable route condition

3.4.1.1Before the cable pulling work commences, the whole trench / pit / tunnel / trough is to be

inspected.

3.4.1.2Sand bedding of special thermal backfill for cables should be filled smoothly and anyobjects as the stones / gravel, which has fallen from the ground to the surface of bedding

layer should be removed.

3.4.2 Checking of Pipes of Duct banks or NDRC

3.4.2.1Before the cable pulling work commences, the pipe ducts for road crossing, etc. are to be

checked to ensure that they are correctly aligned and to be cleaned. The cleaning brush

having suitable size for pipe ducts should be passed through the pipe ducts and to

remove any obstacles in the pipes.

3.4.3 Setting cable pulling winch and drum of cable pulling wire

3.4.3.1The cable pulling winch is to be fixed firmly so that it can stand against the pulling force.

The anchoring and plug supporting will be considered in each place separately and will

depend on the local conditions and pulling forces expected. All manufacturers

recommendations and provisions will be respected, followed and used. In any case the

kinks in the wire rope will not be allowed.

3.4.3.2The winch is to be capable of changeable pulling speed in the range of 0 10 meters per

minute. The winch should be equipped with a tension meter so as to control the cable

pulling tension. The winch will be fitted with overload cutout and chart recorders. Chart

records will be used to record the pulling tension and drum of cable pulling wire should

be appropriately positioned in order to roll up the wire rope easily.

3.4.4 Setting the cable drum on cable drum jack or cable drum trailer

The cable drum transported to the construction site is to be set on the cable drum jack or

cable drum trailer at the approved point. The drum and the cable drum jack or trailer

should be settled at the appropriate position for cable pulling.


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3.4.5 Inspection of the cable surface

3.4.5.1Outer surface of the cable is to be inspected visually for any damages.

3.4.6 Setting cable rollers / curve rollers

Cable rollers are to be disposed at proper position into the trench / pit / tunnel. The

intervals of the rollers are to be kept approximately 2 meters.

3.4.6.1The rollers are to be maintained so as to rotate smoothly. If the cable is planned to be pulled

through curvature, curved rollers should be set at proper position in order to keep the suitable

cable bending radius. The bell mouths with guide rollers shall be installed at ducts in the road

crossing or other service crossings. The key rollers will be secured by bracings supported to thetrench walls.

3.4.7 Setting guide rollers with supporting facilities

The cable guide rollers are settled at the appropriate position between cable drum and

trench / pit / tunnel in order to guide the cable from cable drum to the trench / pit /

tunnel smoothly.

3.4.8 Setting portable telephone (Walkie-Talkie) along the cable route

After the facilities and the equipment were properly set, the portable telephones are to

be located on the drum side, leading end of the cable and the winch side. They are

utilized to control the cable pulling speed and other communication.

3.4.9 Laying of cable pulling wire in cable route

The cable pulling wire should have four times as much safety factor as the calculated

maximum value of pulling tension it is important that the wire is to be handled in such a

manner that it is not twisted, or kinked.

3.4.10 Connection of the cable pulling wire to cable

Pulling eye hook that is fixed at a top of the cable is connected to the cable pulling wire

through a swivel and shackles. Swivel and shackles should have the proper size for cable

pulling.

3.4.11 Cable Pushers


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In the sections having a number of bends, where the calculated cable pulling tension is

very high, hydraulically operated cable pushers shall be positioned at some of the bends

where the tension is going to be high.

These cable pushers grant the necessary grip but prevent the cover of the cable from

damages. By pulling and pushing the cable at the same time, there will be a very low

level of tension on the cable.

The calculation of pulling tension and Side Wall Pressure will determine the positions and

number of the pushers, and pushing forces required.

3.4.12 Cable Pulling Operation with Labor Deployment

Each pulling section will have a drawing / sketch clearly showing the positions of winch

and drum, and calculated pulling forces and side wall pressures at each change. Cable

pulling is to be started gradually.

An experienced foreman is to be used to observe the leading end of the cable. He shouldwalk along the trench and closely monitor the cable being pulled.

Place 2-4 persons to walk with the cable end, a drum operator and at least 3 persons at

drum point for the breaking, labors at every 20 meters to guide the cable along the cable

route, winch operator with 2 labors at winch and one labor at duct bank.

Start pulling. Keep the cable speed and tension in view of the requirement and keep

manufacturers representative informed all the time during pulling and take their advice.

If any problems arise during the pulling will be stopped immediately and started only

after the problem has been cleared.

After cabling is finished, take out the printer record sheet of pulling from the electronic

recorder and preserve. The rotating speed of the drum has to correspond to that of the

pulling speed, if necessary, the rotating speed is controlled with a simple wooden brake.

The pulling speed shall be controlled. During the cable pulling, indication of the tension

meter is to be observed. Special care must be taken when the top of the cable

approaches to the terminating point (jointing position) at the winch side and tail end of

the cable is just going off the drum if the cable remains on drum when the top of the

cable reaches the termination point at winch side, the pulling must be continued to make

a stage where the tail end of cable is just going off the drum.

3.4.13 Cable Pulling in Pipe Duct

Cable will have to be pulled through pipe ducts at road crossing locations. Ducts will be

cleaned prior to pulling of cables by either passing a brush or a sponge ball of

appropriate size. Bell mouths will guide rollers, supports, are installed at / near pipe duct

entrance. Cable pulling lubricant is applied around cable to reduce the friction between

the cable and the ducts.

3.4.14 Cable Pulling Inside Substations

Cable will be directly buried in the ground or will be laid in built up concrete cable

trenches and clamped. Inside hand tools will be used unless otherwise, authorized.

The nose pulling method will be applied for power cable installation. For cable laying

inside substation, the pulling direction will be decided based on cable pulling tension and


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side wall pressure is found will be generally followed as far as practicable. Corner rollers

will be used at the bends and cable pushers wherever required.

The cables will be pulled up to the final locations in front of outdoor termination structure

columns or at the designated GIS basement and lifted up through the floor opening by

chain block.

The fiber optic cables and DTS Cables will be laid along with power cables, and then

along the designed route to the connection boxes located in Telecom Room and Control

Room respectively.

If the substation is live then Limit Access Permit (LAP) must be present in site with the

contractors Competent Person.

3.4.15 Cable Arrangement

After cable pulling all equipment are to be dismantled and put out of the trench.

Particular care is to be taken to avoid cable damage and laborers must not step on thecables.

Surplus of Cables will be organized according to snaking method at both sides of the joint

bay. Phases transposition to be done as per approved drawing. Colored tapes (red,

yellow and blue) will be wrapped around the cables for phase identification at both ends

of the cable.

Cables will be then arranged in the joint bay and protected by covering them with

sandbags/plywood. If required cables will be cut and ends will be protected using heat

shrinkable caps to prevent ingress of moisture. Keep the cable ends pointing upwards as

an additional safety precaution against the ingress of moisture in case substation yard,

as per approved drawing of Cable Routing inside Substation. The cables can be pulled up

to the final locations by hand or motorized cable pushers and will be placed in trenches

in Substation yard.

Power Cable shall be installed on cable supporting structures as per approved drawing of

cable arrangement at terminations.

The works may be performed in live substation yards and in certain proximity of live

conductors. Therefore, it must be ensured that there is enough clearance from the

working area to all live parts according to the present voltage. The safe working

restricted area will be marked and barricaded suitably.

3.5 CABLES LAID DIRECTLY TO THE GROUND

Each cable circuit shall be laid at minimum depth of 1 M, below the road level or the level

approved by client/ consultant, the levels and relative particulars being ascertained by

the Contractor from the concerned authorities.

The final survey shall be conducted for the additional details and informations for the

preparation of As Built drawing.


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3.6 CABLE JOINTING AND TERMINATION

3.6.1 Cable Preparation

3.6.1.1 Cut the existing cable. Align the new cable with existing cable with an overlap of

300mm.

3.6.1.2 Mark a reference point to a distance of 1000 mm from the center point.

3.6.1.3 Strip outer sheath to a length of 500 mm from the reference point.

3.6.1.4 Remove the outer insulation to a distance of 650 mm from the reference point.

3.6.1.5 Tear off the first water- swelling tape to a distance of 650 mm the reference point.

3.6.1.6 Bend back copper wires.

3.6.1.7 Tear off the second water- swelling tape to a distance of 810 mm the reference point.

3.6.1.8 Expose the conductor to a distance of 55mm.

3.6.1.9 Make step less transition zone at the end of the inner insulation.

3.6.1.10 Tear off the second water- swelling tape.

3.6.1.11 Complete the joint.

3.7 JOINT INSTALLATION

3.7.1 Wrap PVC tape around the edge of the conductor on each cable side.

3.7.2 Insert and park aside the heat shrink tubes.

3.7.3 Fit the inner conductor connector, crimp starting from the middle of the connector

towards ends according manufacture instructions.

3.7.4 Remove any burrs and clean the crimped area.

3.7.5 Using the semi conductive tape, fill in the gaps between core insulation and connector

edges, and continue wrapping till you reach and fill the other gap.

3.7.6 Clean the inner insulation surface with the agent solvent.

3.7.7 Apply heat on the first heat shrink tube to cover the water the area around the connector

and overlap the water-swelling tape by 10mm.

3.7.8 Wrap the 3M insulation tape in one layer and 50 % over lap to cover the first heat

shrink tube.

3.7.9 Return back the copper wires in groups as 5 wires per one group.


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3.7.10 Fit the outer conductor connectors for each group and crimp the connectors as per

manufacture instructions.

3.7.11 Wrap the 3M insulation tape in one layer and 50 % to cover lap over the outer

connectors and coppers wires.

3.7.12 Heat the second heat shrink tube to cover the 3M insulation tape.

3.7.13 Roughen the outer sheath surface at the contact area with the heat shrink sleeve.

3.7.14 Put the adhesive mastic tape on the roughen area.

3.7.15 Heat the outer heat shrink sleeve.

3.7.16 Wait some time then make the backfilling.

3.8 LAYING OF CABLE COVERING TILES

3.8.1 Concrete Cable Cover

3.8.1.1Concrete Cable Covers shall be carefully centered over each cable, all being closely

interlocked with the adjacent covers throughout the length of the cables. The cable

covers shall be supplied and installed by the Contractor (See Specification of Cable Cover

Tiles).

3.8.1.2After the cables have been laid and until all the cables in the trench have been covered

with their protection covers, no sharp tools such as spades, pick-axes or fencing stakes

shall be used in the trench or shall be placed in such a position that they may fall into

the trench.

3.8.2 Warning Tape

3.8.2.1A red warning tape having a thickness of 150 micron with Standard Marking shall be

supplied and laid along the mains and sub-mains cable or where directed by the

Authority's Site Engineer, as follow:

3.8.2.2For LV Cables:

-

DANGER - BURIED ELECTRICAL L.V. CABLE BELOW

3.9 BENTONITE FILLING OF DUCTS

After energizing, Bentonite filling material will be applied between gaps of cable and PVC

pipe. This will prevent foreign materials going through the gaps.

3.10 INSPECTION OF WORKS

Inspection with Consultant/Client is done during laying of new cable, joint cable

measurement and testing.


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3.11 BACKFILLING AND REINSTATEMENT

3.11.1 Filling-in of trenches shall not be commenced until inspected and approved the cables

and accessories at site by client/ Consultant representative. Such inspection shall not

unreasonably delay. After the cables are laid, the Contractor shall backfill the trench with

selected and sieved soil in 0.15 m layers, the earth in each layer being well compacted,

watered if necessary, and consolidated.

3.11.2 Concrete cable covering slab shall be placed after the first layer. The slab shall be laidlengthwise on the cable in such a way that the cable is in the centre of the slab.

3.11.3 Each refilled trench shall be maintained in a thoroughly safe condition by the Contractor

at his expense until such time as he can carry out permanent reinstatement of the upper

level and surface so as to restore these to their original condition or to the level of the

surrounding curved stones whichever is higher.

3.12 LAYING OF ROAD CROSSING DUCTS

3.12.1 Ducts shall be laid at road crossing as per instructions of the Authority's Site Engineer

and in accordance with the drawing for underground ducts attached to this specification.

Road crossing ducts shall be installed at a depth of 90 cm. from center line of top ducts

to the finished road top as per the drawing provided.

3.12.2 Ducts shall be laid level and in straight line and where specified shall have concretecover of 10 cm. minimum. The concrete mix shall be in the ratio of 1:2:4, which is one

part of cement, two part of fine aggregate and four parts of coarse aggregate. The space

from the top of the duct block to the road level shall be filled with concrete.

4.0 RESOURCES & SCHEDULE

4.1 RESOURCES

Contractor Project Manager/ Engineer will mobilize (equipment/manpower) required to

carry out activities in a safe manner.

4.2 TOOLS TO BE USED

a. Cable roller to move the cable smoothly inside the trench.


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b. Cable trailer / jack to hold the cable drum.

c. Cable pusher which can push the cable where high tension appears mainly in bend

areas.

d. Blunt Shovels to remove the stones or any gravel over the cable after laying.

4.3 EQUIPMENTS TO BE USED

a. Winch Machine with cable socks

b. Wireless - Phones for distance communication.

c. Crane and Man lift if required

5.0 QUALITY CONTROL

5.1 Contractor Quality Control Inspector is responsible to verify all the construction activities

as per approved QCPs and ITPs in coordination with the Contractor representative in a

timely manner.

5.2 Quality records shall be maintained to each stage of the work and documented as

defined in the QCP till the completion of the works.

6.0 HEALTH, SAFETY & ENVIRONMENT

6.1 REQUIREMENTS

6.1.1 Safety officer shall give an orientation/ Induction talk and he will ensure the Tool Box

talks before starting the activities on site.

6.1.2 All employees and sub-contractors who are engaged in activities at the working site shall

be provided with the list of PPE below, all working personnel shall perform full PPE as a

requirement by the companys HSE policy.

6.1.3 Visitor to the site should comply with the safety procedures and should use required PPE.

List of the provided PPE:

Safety Shoes Safety belt, harness (if applicable)

Helmet Gloves (if applicable)

Safety Glasses Ear protection (if applicable)

Safety Dress Noise protection (if applicable)

6.1.4 Regular HSE meetings at various levels, at all locations are to be held to ensure the

communication and feedback to HSE issues.

6.1.5 The safety officer observes and make sure that the working environment is safe and allthe running activities are safe.

6.1.6 Prior to commencement of any activities, the work force will be briefed about the project

and safety requirements.


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6.1.7 The safety officer shall report any incident and stop any unsafe activity.

6.1.8 The safety officer shall inform the site engineer and the project manager of any violation

against HSE and report to the HSE Manager.

6.2 SAFE WORKING PROCEDURES

6.2.1 Excavation and Backfilling

6.2.1.1Abide by Municipality of AUH Excavation and cable laying specifications.

6.2.1.2Provide barricades around and necessary sign boards nearby the excavated area.

6.2.1.3Never enter an excavation deeper than 1m, which does not have a safe access way and

not inspected by a competent person before allowing an entrance, or which has

equipment working next to the edge.

6.2.1.5Always identify underground lines and services prior to starting excavations.

6.2.1.6All workers to leave trenches during rainstorms.

6.2.1.7If mechanical excavations are used, extra caution to be taken. A supervisor shall lead

the operator after making trial pits.

6.2.1.8Fix the emergency Contacting Nos. nearby the excavated areas.

6.2.1.9No personal will be allowed to enter inside the trench while backfilling.

6.2.1.10 Cable will be protected by concrete tiles over it and warning tape over the tiles to

highlight underground utilities.

6.2.2 Cable Laying and Joints

6.2.2.1Cable pulling machine (Winch machine) and cable trailer shall place in right position

which is straight to the trench and properly locked for not moving.

6.2.2.2Check the trench which is safe to access for pulling the sling from the winch machine to

the cable trailer

6.2.2.3Cable socks shall be tied properly with the cable end

6.2.2.4A signal men shall give signal for the winch operator and the people near to the drum forgiving signal by Red and Green color flag if any problem in the trench mainly in the bend

and duct area.

6.2.2.5Sand bed for 10cm shall be done before cable laying and any stones or hard substances

which can damage the cable will be removed immediately.

6.2.2.6All personals shall be in proper PPEs.

6.2.2.7Closed supervision shall be arranged.

6.2.2.8Heat stress awareness training shall be provided to the work force and De hydrationpowders with shades (umbrella) & frequent rest shall be provided, while they working on

the hot weather.

6.2.2.9Client PTW procedures shall be followed according to the requirements.


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6.2.3 Lifting Safety

6.2.3.1Know the weight of the cable drum and Check the Safe Working Load of Lifting Tackle

6.2.3.2Do not over load the Lifting Tackle and Inspect prior to every use. Do not use the

damaged, if so return to store.

6.2.3.3Co-ordinate among the people also Good communication and provide awareness.

6.2.3.4All personals on site should follow the PPE requirements.

6.2.3.5Ensure the lifting accessories/ equipments are satisfying the basic safety standards.

6.2.3.6Ensure the color coding for the lifting accessories.

6.2.3.7Ensure the availability of banks man/ Rigger on site and shall implement proper

communication facilities also.

6.2.3.8Manual handling shall be avoided as far as possible and shall implement the tag linesystem for directing the lifting load.

6.2.4 Tool Safety

6.2.4.1Proper tools shall be used for the activity.

6.2.4.2Competent and experienced personals shall be assigned for working with dangerous

tools or will provide closed supervision.

6.2.4.3Moving parts of the tools or equipments shall be covered or guarded properly.

6.2.4.4Relevant PPE shall be ensured on site.

6.3 HAZARDS/ASPECTS

Hazards/Aspects Associated with Cable Laying & Allied Works

S.N. Hazard(s) / Aspect(s) Recommended Control Measure(s)

Activity: Excavation

1 Collapse of trench sides

Sides of excavation, deeper than 2m to be stepped 1m

increments with 45 degree slope or suitably shored.

Support sides in suitable way.

2Materials falling onto people

working in the excavation

Provide guard rails, Do not keep any material close to

excavation, Warning tape to be placed around all

excavations less than 2 meters deep, Metal or wooden

barriers to be placed around all excavations deeper than 2

meters

3People & vehicles falling into

excavation

Stop blocks to prevent vehicles over-running, Keep

vehicles away from excavations , prevent vehicles over-

running, stop signs, Metal or wooden barriers to be placed

around all excavations deeper than 2 meters


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4 People being struck by plant

High visibility PPE, Keep workers separate from moving

plant, Make proper awareness. Ensure the reverse alarm,

revolving lights for machineries

5Contact with underground

services

Use cable locators to trace in services.

Hand dig if in doubt. Use cable locators to trace anyservices, Existing services to be located and clearly

marked before beginning excavations, Approved existing

services layout drawing to be distributed to all concerned

parties through controlled document distribution

6

Biological hazards: Rubbish and

waste Drains/sewers

Leptospirosis

Prevent contact, Make awareness, Existing services to be

located and clearly marked before beginning excavations

7 Flooding of excavationsPrevent entering trench while flooding.

Use dewatering system and support sides.

Activity: Backfilling

1Backfilling trench while worker

inside.

Avoid backfilling while anyone inside the trench. Arrange

closed supervision. Make proper awareness.

2 Usage of compactor machineReduce exposure time.

Shifting of personnel.

3Working near excavator

machine working

Increase distance and reduce exposure to noise, use earmuffs, awareness, PPE, Use less noisy excavator and do

regular inspection and maintenance.

4 Working in hot weather

Provide water, shelter, Awareness, frequent rest, stop work

in very hot timings. Arrange the work schedule in morning

and evening hrs.

Activity: Cable Laying

1

Pulling cable to trench/out of

trench

Follow manual handling techniques. Machines the work,

proper awareness, selection of man power. Ensure PPE's

2 Working in vicinity to live cableAvoid connection with live cable / water in trench, PPE,

Awareness, ensure and check the up dated drawings.

3Slipping during laying

cables/removing cables

Avoid walking on the trench sides, proper sign boards,

closed supervision, watch steps, PPE

4 Flooding of trenchPrevent entering the trench while flooding, use dewatering

system and support sides, closed supervision

Activity: Cable Jointing


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1Removing insulation/ jacket of

cables using sharp blade

Vaccination, first aid, Proper PPE, make awareness,

arrange an experienced team, proper waste segregation

and disposal

2 Working in vicinity to live cableAvoid connection with live cable / water in trench, PPE,

Awareness, ensure and check the up dated drawings.

3Jacketing cable junction using

gas flame

Training, avoid contact with fire, closed supervision,

availability of fire fighting equipments, PPE

4 Flooding of trenchPrevent entering the trench while flooding, use dewatering

system and support sides, closed supervision

Activities: Loading/Unloading Cable Drums.

1 Overloading the crane

Check crane capacity, check ground inclination. Checkrating of rigging components for intended loads. SWL to

be clearly indicated. Mobile cranes to be securely footed;

outriggers to be checked; supporting plates to be used

when the ground is loose.

2 Failure of lifting gear

Clear the loading area, Barricaded well and ensure the

Sign Boards. And ensure the PPE also. Cranes to be

inspected & tested by approved third party.

All lifting gear and operator to be certified by 3rd party

Safe working load (SWL) should be clearly marked on

crane and lifting gear.

3

Wrong signals/ confusing

signals/ different signal,

different sources

One banks man/ signalman, training, direct eye contact.

Banks men and crane operator to be fully familiar with

crane hand signals. Use standard crane hand signals for

visual lifting commands.

4 Directing load by handsUse tag line to direct load. Ensure the relevant PPEs in

order to avoid any injuries.(Eg : Hand Gloves)

5Moving load overheads/

working/walking in loading area

Clear the loading area, PPE. Boom swing area to be

barricaded; unauthorized personnel not to be allowed

6

Sling load may hit employees or

materials

Boom swing area to be barricaded; unauthorized personnel

not to be allowed

7 Falling materials while liftingLoose materials shall not be lifted other than in material

basket. clear the loading area, Ensure the PPE

8Sling or Boom may Hit on

Electrical lines/ Other utilities

Rigging and rigging plans checked by competent person

prior to use and ensure the Lifting area is free from those

hazards. Use standard crane hand signals for safe lifting.

Banks men and crane operator to be fully familiar with

crane hand signals

Note: Supervisor and Safety Officer shall be alert and spot hazards/aspect (if any others) and will take

control measures.

7.0 REFERENCES


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1. Project Quality Plan EPD/PPC/FRM006

2. Project HSE Plan EPD/PPC/FRM007

3. Installation Requirements for LV Underground Cable S-AAA-CAB-INST-LV

lv cable laying.doc

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