For adequate space for cable installation and maintenance sufficient space shall be provided and maintained above cable tray ladder and trunking.
Cable tray and trunking installation.
All the accessories shall be factory made.
Metallic or pvc trunking shall be fixed by means of suitable screws to approved type of asbestos or fibre fixing plugs at intervals not exceeding 60.
Installation method of trunking.
Types of cable trays.
Tray and trunking joints are to be positioned as close to the supports as possible.
Cable tray cable ladder cable trunking all of these are available with a full range of fittings and accessories.
All the supports in the roof area shall be provided as per the approved roof coordinated mep services installation details drawings.
Fittings fittings are sections of cable trays which are joined to other cable trays sections for the purpose of changing the direction elevation or width of the cable run.
Cable tray and or trunking shall be kept on worksite project undercover in dry well ventilated storage facilities building.
The egc is the most important conductor in an electrical system as its function is electrical safety.
All metallic cable trays shall be grounded as required in article 250 96 regardless of whether or not the cable tray is being used as an equipment grounding conductor egc.
Following are the steps to be done for laying cables on wall mounted cable tray.
Fixed with independent mushroom headed electro plated bolts nuts and serrated washers.
Make expansion connections wherever cable tray and trunking are crossing building expansion joints.
The size length and intervals of the support to be as per the specification standards.
Nema ve2 covers cable tray installation guideline which covers receiving unloading and storage of materials.
This cable tray support system drawing has isometric view and cross sectional view.
The metal in cable trays may be used as the egc as per the limitations of table 392 60 a.
It is used to make cable laying and good support.
All fittings are available in sizes and types.
Install 12 5mmx1 5mm copper earth bonding straps externally between all length of cable tray trunking cable ladder and provide a copper bending straps across each joint.
Trough ventilated cable tray.
Installation of gi cable trays and trunking in the roof area.
Below drawing shows how to install cable tray and its support system.
Solid bottom cable tray.
Pedestal shall be provided for the floor mounted supports for the cable trays and trunking.
Sharp edges or other things in cable tray trunking and ladder that are capable of damaging the insulation or cable sheaths should be avoided.
Installation of cable tray or trunking system for building electrical services to make sure that the entire installation is in conformance and in accordance with the design intent of the project for the electrical and low voltage system in addition to the specification and as per approved shop drawings and comply with local and international.
Cable tray sizes cable tray types ladder and perforated cable tray are the two types of electrical trays.
