Method Statement Title: Installation of Cable Trays and Ladders
1.0 Scope
1.1 This method statement details the method of installation of cable trays and ladders.
2.0 Material
2.1 Cable trays and ladders and accessories shall be as per approved material submittal.
3.0 Applicable Location
3.1 Tower E1, E2, E3, W1, W2, W3 and Podium – Electrical closet, ELV closet and Mechanical rooms.
4.0 Method
4.1 Storage
4.1.1 All materials received at site shall be inspected and ensured that the materials are as per approved material submittal.
4.1.2 Any discrepancies, damages etc. shall be notified and reported for future action.
4.1.3 Material found not suitable for the project are removed from site immediately.
4.1.4 Cable trays and ladders are stored horizontal position on flat surface with timber support at each meter and covered to protect from moisture and direct sunlight.
4.2 Installation
4.2.1 After the civil clearance to proceed with MEP installations, ensure the area is clean and ready to start the works.
4.2.2 Ensure all the relevant current / approved shop drawings are available with the installation team.
4.2.3 Required quantity of standard length of trays and ladders and accessories are shifted from site stores to the work place with help of cranes and wheel barrow, clean the material for dust from storage and transportation.
4.2.4 Mark the trays and ladders routes as per approved shop drawing, ensure these are of horizontal and vertical runs only.
- Coordinate the routes, levels and ensure there are no clashes with other services.
4.2.6. Maintain enough clearance for cable pulling and any access for future maintenance.
4.2.7 Mark the support, fix the supports with appropriate metal plugs, threaded rods and nuts (or) ‘L’ angles/Slotted ‘C’ channels and nuts. A maximum of 1.2 mtr. distance is maintained between the supports to avoid sagging of trays and ladders. Provide adequate supports at 150mm for bends, branches and offsets.
4.2.8 Cut the standard length of tray / ladder to required length with appropriate cutting tools and fixing holes with drilling machines. And fixed with the necessary accessories. Use mushroom head screws on the cable route to avoid the cable insulation damage during pulling.
- All the fittings shall be from manufacturer.
- Expansion provision shall be provided at all the building expansion joints.
- Manufacturer’s instruction for installation shall be followed.
- Approved fire sealant shall be provided wherever the installation crosses the fire rated walls.
- Sleeves shall be provided at all the wall crossing.
- Copper earth links shall be installed at every joints to maintain continuity throughout the installation
- Ensure the installations of tray/ladder are neat, in straight line for good aesthetic look. Trim the extra projected supports.
- All sharp edges and burrs shall be cleaned for pulling of cables.
- Treat the cut and drilled part with zinc rich paint immediately after cutting and before installation.
- Provide identification labels as specified to identify the service.
- Inspection shall be offered for QC verification.
- All the installed cable trays to be protected from damages.
5.0 Records 5.1 Inspection request duly signed-off by NMX and Consultant.
