Method Statement for Cable Tray Installation

1 SCOPE ………………………………..
2 REFERENCE DOCUMENTS ..
3 DEFINITIONS AND ABBREVIATIONS ..
4 REFERENCE STANDARDS …
5 AUTHORITIES AND RESPONSIBILITIES ..
6 METHOD AND GUIDELINES FOR CABLE TRAY INSTALLATION..
6.1 General Requirements ……….
6.2 Material Receiving, Handling and Preparation…
6.3 Installation of Cable tray…
7 TOOLS AND EQUIPMENT..
8 INSPECTION / TESTING….

Method Statement for Cable Tray Installation

1 SCOPE

This Method Statement covers the installation guideline of cable tray system (supports,
cable tray assembly, joints and ground bonding). This document aims to control the erection
of cable tray installation, cable tray supports and its accessories to be carried out in – Electrical Installation Works. This method
was prepared in reference to scope of work as guideline for effective enforcement of work.
Thus, construction personnel have to determine the applicability and feasibility of this MS in
accordance to approved construction drawing and site condition.

2 REFERENCE DOCUMENTS

a) Applicable / Approved International Standards
b) Issued For Construction Drawings
c) Manufacturer Instructions.

3 DEFINITIONS AND ABBREVIATIONS

Integrated Solar Combined Cycle Power Plant
IEC International Electro-technical Commission
NEC National Electrical code
NEMA National Electrical Manufacturers Association
RFI Request for Inspection
MRR Material Receiving Report
NCR Non-Conformance Report.

4 REFERENCE STANDARDS

NFPA 70 – National Electric Code
NEMA – National Electrical Manufacturer’s Association
NEMA VE-1 – Metal Cable Tray System

NEMA VE-2 – Cable Tray Installation Guidelines
IEC 61537 – Cable Management – Cable Tray Systems and Cable Ladder System.

5 AUTHORITIES AND RESPONSIBILITIES

Site Manager – Determine all requirements needed in order to comply with contractual
requirements and safety standards.
Construction Manager – Lead all construction activities and enforce strict adherence to all
project requirements.
Electrical Superintendent – Ensure that work once started is carried out as planned and
that the applicable standards are complied with. Check working methods and precautions to
be taken by the supervisors/foreman before commencing work.
Field Engineer – Ensure that all related works are carried out in accordance with approved
Released for Construction drawings, specifications, schedule, quality and safety. Report to
Construction Manager.
Safety Officer – Ensure that “Safety, Fire, Loss Prevention” program or Safety Plan was
been implemented and monitored.
Supervisor / Foreman – Supervise all field installations Reports to Electrical
Superintendent.
QC Inspector – He shall be responsible for conducting surveillance and inspection duties
for work and ensuring quality compliance and efficient recording and reporting of results as
required. He shall review all relevant documents, material conformance certificates and nonconformance

reports and shall receive all internal requests for inspection from various
sections of implementing work and prepare (RFI) Request for Inspection as per schedule
work priorities and proceeds the Quality inspection with the client, owner representative as
required.

6 METHOD AND GUIDELINES FOR CABLE TRAY INSTALLATION

6.1 General Requirements

a) Issued for construction drawing and lay-out will be made readily available for reference on the installation of cable tray system.
b) Cable trays are used for the support of single conductor cables tri-plexed cables, and multi-conductor cables. Power cables will be run on cable trays separate from control cables and instrumentation cables.
c) The cable and containment installation will be checked for medium voltage/low voltage cables.
d) Cable tray supports are to be spaced to ensure that the deflection of the fully loaded trays or do not exceed the spacing and no distortion will occur when supporting erection staff during cable installation.
e) All horizontal and vertical bends, horizontal and vertical tees, and crosses, standard radius fittings will be used.
f) Cable trays to have adequate continuity for equipotential bonding and not to be used as circuit earthing conductor.
g) Cable ties of approved type to be used for all cables on vertical runs, horizontal runs in the vertical plane, and horizontal runs where the ties are in direct sunlight.
i) Covers to be provided for trays where cables are in direct sunlight.
j) Internal barriers for cable trays will be the same height as the internal depth and the barriers to be securely anchored to the trays with smooth head bolts, nuts, and lock washers.
k) All the vertical runs of cable trays routing through floors and platforms below the finished floor elevation to be provided with solid flush covers.
l) For cable trays routed under gratings and walkways, the tray covers shall be extended beyond the extremity of the walkway or grating.
m) Each cable tray should be labelled in accordance with the cable schedules. Markers
on the cable trays will identify the tray numbers and voltage level as shown and
noted on the drawings, and will be installed on both tray side rails.

n) Tray numbers will also be identified at the intersections where tray numbers change.

6.2 Material Receiving, Handling and Preparation

a) Check availability of all Issued for Construction drawings, detail drawings and  schedules. Check if cable tray conforms to project requirements, standards, and specifications prior to release to be used as part of the work.

b) Handling, loading and unloading of cable tray must be observed.

 Check cable tray for completeness using the manufacturer’s packing list.
 Inspect cable tray and accessories for any possible damage.
 Special care must be exercised using slings to avoid possible damages in storing cable tray.

 To prevent damage on the cable tray, never pull cable tray from truck by chaining the bottom rung and dragging out of the trailer.

 Stack cable tray, fittings and accessories by width and type.
 Wear proper PPE when manually unloading and ensure that trays will not be dropped.

c) Check those cable trays are free from burrs or other sharp projections that could cause damage to the cable jacket during cable pulling.
d) Storage of cable tray
 Cable tray can be stored outdoor; hence they should be loosely stacked, elevated off the ground and ventilated to prevent storage stain.
 Store small accessories indoor.
 Cable tray should be stored away from high traffic areas.
e) Withdraw sufficient quantity of materials for work to prevent materials from lose and improper storage.
f) Prepare the work permit (as per company procedure) before installation, verifying the safety measure requirements, information to involving parties and approval of work commencement.
g) Wear proper PPE during installation of cable tray system.
h) Ensure that the work area is safe and clear from any danger. Identify any hazards and take necessary preventive actions.

6.3 Installation of Cable tray

a) Prepare all the necessary materials/tools required. Cable tray and support for inside building will be as per classification/standards which is required in the approved IFC drawing.
b) Check availability of all Issued for Construction drawings, details drawing and schedules.
c) Verify site access/routing and marked supports locations. Follow cable tray routing and supports location as per drawing Issued for Construction.
d) Proper coordination has to be made with other subcontractors to ensure no obstruction or any interference with other services to happen during and/or after the course of erections.
e) Install/erect proper scaffolds/ladders wherever required for safe installation practices.
Scaffolding must be approved for use in accordance to safety requirement and practices.

f) Support installation will be executed in accordance to approved Construction Drawing and site condition. Any obstruction or interference to support lay-out must be informed to the Contractor/Client for re-routing and/or approval. Follow the typical installation guideline for installation of support.

Typical Cable Support Installation Spacing and Location:

1. In order to install the cable tray supports, first, find the required elevation from the floor to the bottom of the cable tray and establish a level line.
2. Bore concrete for anchoring and hanger support. Ensure that anchors are properly fixed and aligned. If welding and brazing will be done for support installation, secure hot work permit and approval as per project requirement.
3. As a general practice, avoid placing splice plates over supports or at mid-span.
4. Ideal installation of cable tray wherein splice joints fall between the support and the quarter point.
5. Length of unistrut support will be cut upon survey and dimension checked on the field of activity.
g) Check clearances of support installation from any services as per Construction Drawing and Specification.
h) Ream to smooth and paint the cut sharp edges of Cable trays/Supports.
i) Carefully lift tray individually. Temporarily fix tray into support while splicing of other trays is on-going. Ensure that safety precautions were installed for fall hazard protections.
j) Make a square cut of cable tray to ensure a good splice connection. After cutting, smooth the cut edges to remove any burrs.
k) Drill holes for splice plates in field-cut cable trays. Locate hole positions using splice plate as a template.

l) Align supports and tray before permanently fixing and splicing with bolts or fasteners.
m) Install supports as close as possible on 90-degree bend, offsets, tee/cross branches, change of level, etc. to ensure rigidity and firm holding of loads.
n) Internal barriers for cable trays shall be the same height as the internal depth and the barriers to be securely anchored in the trays with smooth head bolts, nuts and lock washers.

o) Installation of grounding bonding for cable tray:

1. Drill holes for grounding bonding holes in side rail from each end of the splice plate so that the jumper will span the discontinuity. Do not use splice plate bolt locations to connect jumper to cable tray.
2. Place screw head on inside of cable tray, put jumper outside of cable tray, add flat washer, and locknut, and tighten.
3. An equipment grounding conductor must be run from the conduit to the cable tray.

p) After completion of the work, carry out inspection prior to cable pulling. Examine cable paths to ensure all areas are free from debris that may interfere with the cable’s installation.
q) Covers are to be installed for trays where the cables are in direct sunlight.
r) Splice/connecting bolts will be properly torque.
s) Marked-up/As-built drawings for any changes of cable tray routing.
t) Perform housekeeping in daily task basis.

7 TOOLS AND EQUIPMENT FOR CABLE TRAY INSTALLATION

a) Electric Hand drill and drill bits
b) Hand tools (i.e. spanners, files, hammer, hacksaw, etc.)
c) Spirit level
d) Grinding machine
e) Fitters Tool Kit
f) Wire Brushes
g) Torque Wrench
h) Disc Cutter
i) Timber and Props
j) Metal measuring tape
k) Welding machine

8 INSPECTION / TESTING FOR CABLE TRAY

All inspections to be coordinated by QA/QC Inspector, who will implement the inspection program and notify all parties involved in advance of the scheduled dates of inspection, to enable them to participate. Relevant records will be signed by all required parties. Original copies will be kept by the QA/QC Department. Final erection checking shall be carried out in accordance with approved ITP. Inspections will be done per level, area or drawings.

Prior to any inspections, verify and check cable trays as per IFC drawing, detail drawing, materials specification; supports and accessories are installed in a workmanlike manner as shown on drawings and according to technical and quality requirements.