1. Scope of Works

Scope of Activities

The Cable Ladder/Tray/Trunking system shall confirm to the material and fabrication

requirements as per this specification. This scope defines the minimum standards to be

adopted when installing Cable Containment for Ladder/Tray/Trunking in buildings and

structures according to Electrical specification of client. Cable Containment shall be installed

surfaced-run in the concrete slab/wall according to construction co-ordination drawings.

Site Procedure

Site mobilization shall be done with real time monitoring the conditions & progress of builder

works. Before commencement of the work, carry out examination of the physical condition of

the area. Photographs should be taken where necessary, prior to commencement and

during works.

Method Statement

I. Preparation stage

a. Prior to install cable containment; examine cable containment paths to ensure all

areas free of debris that may interfere with the installation.

b. Cable containment generally bundled and ship to site for delivery.

c. Special care must be exercised using slings so the cable containment is not crushed

from the improper location and lifting by sling.

d. To prevent damage to cable containment, never pull cable containment from truck

trailer by chaining to bottom rung and dragging out of trailer.

e. To prevent damage to cable tray, never pull cable tray from truck trailer by chaining

to bottom rung and dragging out of trailer.

f. Inventory all items immediately after unloading, using manufactures packing list.

g. Cable tray should be stored away from high traffic areas. Cable tray should be

stacked by width and type.

h. After storing the tray/trunking at designated place, it is covered by plastic canvass to

protect from any adverse atmospheric condition.

i. After installation of cable containment, it is protected by polythene sheet to avoid

dust and moisture.

j. Factory/standard proprietary bends and tee-pieces, among other, shall be used as

per specifications.

k. The brackets and hangers, among others, shall be hot-dip galvanized and painted

with rust-proof primer as specified.

II. Installation stage:

Ladder/Tray/Trunking

a. Site survey the proposed routing as per approved CSD / Shop Drawing by Foreman and

Sub-Contractor.

b. Installation must be carried out based on approved shop drawings and samples by

Foreman and Sub-Contractor.

c. Select the correct size of anchor bolt and supporting bracket by Engineer, Foreman and

Sub-Contractor.

d. Install the correct size of Ladder/Tray/ Trunking, anchor bolt and supporting brackets by

Foreman and Sub-Contractor.

e. The spacing between hanger/bracket supports shall be 1M, and the bracket size shall be

41X21 & 21X21.

f. The expansion bolt size is of M8, M10 & M12 shall be used.

g. Check to ensure no sharp edge within the Ladder/Trunking/ Tray compartment by

Foreman, Assistant Foreman and Sub-Contractor.

h. Cable tray supports - Supports for the cable tray should provide strength and working

load capacities sufficient to meet the load requirement of the cable tray wiring system.

Consideration should be given to the loads associated with future cable additions.

i. Cable tray installation - Place the next straight section across the next support, and

attach it to the previous section with a pair of splice plates and hardware. Splice plates

should be placed on the outside of the cable tray with the bolt heads on the inside of the

cable tray.

j. Expansion splices plates - It is important that thermal contraction and expansion be

considered when installing cable tray system. The length of the straight cable tray run

the temperature differential governs the number of splice plates required.

k. Hanger Rod Clamp - Install thread nuts onto threaded rod approximately 225mm( 9” ),

above desired location for bottom of cable tray. Place the clamp around side rail of cable

tray. Then lift entire cable section onto threaded rod running through holes in clamps.

The threaded a second set of nuts onto threaded rod moving them up until bottom of

cable tray reaches desired location.

l. Each joint shall have a tinned copper bond bolted to each adjacent tray/ladder at two

locations to ensure electrical continuity.

m. Single Channel Cable Tray Hanger - Install thread nut to threaded rod to height required.

Place hanger on threaded rod and follow with one nut. Run nut up threaded rod until

bottom of hanger is at desired height. And run top nut down to tighten. Then place the

channel on hanger and secure in place as necessary.

n. Marking - Using a square that reaches across width of the cable tray, gauge off the edge

of one side rail and mark both flanges see fig below. Next, position the square as shown

in figure. And mark the web of the rail. Marking can be done with scribe, marking pen, or

a pencil.

o. Cutting - The cut can be using a hand held hacksaw, carbide tipped circular saw,

diamond dusted blades, hand held band saw, offset bolt cutters or high speed grinder. It

is important to get square cut to ensure good splice connection. Cable tray manufactures

offer jigs and other devices to aid in the field cutting. After cutting, smooth the cut edges

to remove any burrs and apply rust proofing agent and coat of with its matching color.

Where any cutting involve, the finish shall be made good. The cutting edge shall be

treated with rust-proofing agents, zinc epoxy and coat of colour matching paint

respectively.

p. Drilling - Holes for splice plates must be drilled in field-cut cable trays. The most

common method of locating the hole position is to use a splice plate as a template. Drill

jigs (see the below fig) are also available. A short piece of side rail that is punched with

standard factory hole pattern can be bolted to the splice plate to serve as a stop that

rests against the end of the field-cut side rail. Clamp the splice plate to the rail and drill

through the splice plate holes and the side rail. The correct drill size is dependent on the

hardware supplied with cable tray. Match the holes that exist in the cable tray. After

drilling, remove the burrs.

q. After installation of cable Ladder/Tray/Trunking, Engineer-in-charge shall check the

complete works and complete the Inspection Checklist for Cable Containment

Installation for Cable Tray, Ladder and Trunking. (See Appendix 1)

r. Engineer-in-charge shall arrange and request for inspection with the Owner’s

representative Residential Technical Officer (RTO) using approved Main con Request for

Inspection (RIN) form.

III. Approved Materials

Preferred Brand for Ladder

TrayTrunking

Applicam (AIS)

2. Project Organization for Health & Safety Control

(See Appendix 2)

3. Health & Safety Risks and Controls

(Please refer to attach Risk Assessment in respect to above scope of works – Appendix 3)

4. Access / Egress

Proper scaffolding & ladder shall be provided for access into cable ladder/tray/trunking containment as applicable.

5. Lighting

Adequate temporary / task lighting shall be provided if work to be carried at night or at dark places.

6. Plant & Equipment

S/N Description Unit

1 Metal cutting saw 1 lot

2 Touch up material 1 lot

3 Screw driver 1 lot

4 Electrical drill with bits (only for surface installation works) 1 lot

5 File 1 lot

6 Diagonal-Cutting Pliers 1 lot

7 Open end Wrench 10 and 13 mm ends 1 lot

8 Side-Cutting Pliers 1 lot

9 Tape measure 1 lot

10 C - clamp 1 lot

11P.P.E. – Personal Protective Equipment (safety helmet,Boots,gloves & safety vest )

1 set per worker

*The above machinery & Equipment used quantity will be varied depending on site conditions and production rate.

7. Personnel Training Certificate( Appendix 4 )

8. Waste management

The Rubbish which would be created from our scope of works will be disposed to the designated dumping ground.

9. Special Control measures

The following general control measures against Safety, Environment and Quality shall be required for our scope of work and special control measures are not applicable for us

Proper PPE must be worn at all time

Permit to work at height > 2m where applicable

Lifting operation permit (using crane) where applicable.

Confined space permit where applicable.

Approved work method statement and risk assessment will be made available to site. All

workers doing the work shall be briefed on this method statement and risk assessment.

ANNEX 1:

Checklist Cable Containment Installation on Cable Tray,

Ladder and Trunking

ANNEX 2:

Project Organizationfor Health & Safety

Control

ANNEX 3:

Risk Assessment

ANNEX 4:

Personnel Training Certificate