Cable Tray Support Spacing Nec

Large retail and warehouse installations use cable tray to support their data communication cable systems.

Cable tray support spacing nec.

Or in ventilated trough cable tray. Cable tray is classified by the nec nfpa 70 the national electrical code as a support system and not as a raceway. Articles 318 250 and 800 cover various aspects of cable tray systems. This is a critical distinction because it means the requirements for the cable contained in raceway is different than cable supported by cable tray.

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. Nema national electrical manufacturers association is an association comprised of the major cable tray. The national electrical code publishes the standards for all types of electrical applications. Generally speaking raceway completely encloses the cable inside of it.

Welding cable can be installed in accordance with article 630 part iv. 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. It would be impossible to have the wiring system flexibility they need with a conduit wiring system. Make use of cable tray to support and route the large volumes of cable needed for their operations with a high degree of dependability.

Support for the equipment also must be in accord with the appropriate nec article.