Cable Trunking runs shall be arranged so that the lid is always on top or side.Where cable trays are installed in roof or exposed to sunlight, factory made cover shall be fixed to protect the cables from direct sunlight.The cables to exit through the bottom of the cable tray.It should be mounted far enough off the floor or roof to allow drainage of water.Cable trays installed on roof shall be supported using Gl brackets or concrete blocks.Cable tray should not be laid directly on the floor or roof.Cable Tray Installation on Roof / Floor:.Earth continuity shall be ensured throughout the length of the Trays and Trunking.However, approval from the engineer is required.
Use insulating barriers where it is necessary. If the conductors carried by trays or ladders are of various systems, the ELV and data processing or different insulation, the cable ladder or trays should be separate.The cables should not be stacked together. The width of Cable Tray/trunking/ladder should have sufficient width to take the cable without crowding and shall allow for future 25% space.Ensure that the Cable Tray’s, dimension, elevation and other fittings are properly leveled and that they are coordinated to the other services fixtures.Offset Reducing Connection & Tray to Box / Floor Connection:.Both Inside and Outside Fittings should be additionally supported at a distance no greater than (24″) from each end. At the bottom of runs, they should be supported at the top of the elbow and within 610 mm (24″) of the lower extremity of the elbows. Vertical cable tray elbows at the top of runs should be supported at each end.Vertical Inside / Outside Support: NEMA Standard.
0 kommentar(er)
