Cable Tray Support Spacing Nec

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

Cable tray support spacing nec.

It would be impossible to have the wiring system flexibility they need with a conduit wiring system. Or in ventilated trough cable tray. Nema ve 1 this standard specifies the manufacturing requirements for metal cable trays such as. Articles 318 250 and 800 cover various aspects of cable tray systems.

Generally speaking raceway completely encloses the cable inside of it. Welding cable can be installed in accordance with article 630 part iv. 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.

The national electrical code publishes the standards for all types of electrical applications. Nema national electrical manufacturers association is an association comprised of the major cable tray. 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. 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.

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