If a tray runs vertically up a wall, the cables must be securely fastened to the rungs to prevent gravity from pulling them down. Cable trays are a support system for electrical cables, power, signal, and communication and optical fiber cables. NEC section 300-8 does not permit any tube, pipe, or equal for water, air gas, drainage, steam, or any service other than electrical in raceways or cable trays containing. The primary rulebook used in the safe use of cable trays is NEC Article 392. You should consider it as a series of instructions that make the buildings resistant to. Standard Aluminum Ladder • The rungs provide a convenient anchor for tying down cables in vertical runs or where the positions of the cables must be maintained in horizontal runs. • A ladder cable tray without covers provides for. Cable trays are not raceways, but they are treated as a structural component of a facility's electrical system.
[PDF Version]