Cable Tray Support Spacing Nec

Or in ventilated trough cable tray.

Cable tray support spacing nec.

Make use of cable tray to support and route the large volumes of cable needed for their operations with a high degree of dependability. Single conductor cable must be 1 0 awg or larger and be permitted to be used in cable tray. If the cable is sized 1 0 awg through 4 0 awg it must be installed in ladder type cable tray with a maximum rung spacing of 9 in. Large retail and warehouse installations use cable tray to support their data communication cable systems.

Concurrently nec 392 6 j permits cable tray systems to externally support raceways cables and boxes and conduit bodies as covered by section 314 1 provided that the cable tray is listed and designed for the application. This is a critical distinction because it means the requirements for the cable contained in raceway is different than cable supported by cable tray. Nema national electrical manufacturers association is an association comprised of the major cable tray. Welding cable can be installed in accordance with article 630 part iv.

It would be impossible to have the wiring system flexibility they need with a conduit wiring system. Generally speaking raceway completely encloses the cable inside of it. Channel cable tray ladder cable tray single rail cable tray wire mesh cable tray solid bottom or nonventillated cable tray and trough or ventilated cable tray and associated fittings for use in accordance with the rules of the national electrical code. The national electrical code publishes the standards for all types of electrical applications.

Cable tray is classified by the nec nfpa 70 the national electrical code as a support system and not as a raceway.