field assembly optical connector requirements is you acquire to avenue

Posted by zai li on August 3rd, 2016

fiber optic box address ablaze for control, signaling and communications through an optical fiber (see Bulk 770-3 un770-03 770-04.cdr). The NEC recognizes three types:

Nonconductive. Board annihilation that can conduct electricity, so will not accidentally animate or be activated even if carefully associated with electrical conductors.

Conductive. Board noncurrent-carrying conductive associates such as brownish courage members, brownish breath barriers and brownish armor or sheath.

Composite. Board optical fibers and current-carrying electrical conductors. Classify these as electrical cables in accordance with the blazon of electrical conductors. [770.52(A)]. Use blended cables alone breadth the optical fibers and current-carrying electrical conductors are functionally associated.

You acquire to accommodated Chapter 3 approach requirements, but there are exceptions. For example, if your approach contains alone nonconductive cables, you can abstain the Chapter 3 and Chapter 9 wire ample requirements. Otherwise, those requirements administer (see Bulk 770-6 un770-06 770-06y.cdr).

In an optical raceway, you can use alone nonconductive optical fiber cables. This is a manufacturer’s advertisement claim (see the UL General Advice for Electrical Accessories Directory) and not begin in the NEC. However, the NEC does crave you to use listed equipment.

Another affair to bethink about field assembly optical connector requirements is you acquire to avenue those cables so they don’t anticipate the abatement of abeyant beam panels. That goes duke in duke with 770.8, which requires installing accessories and cabling in a accurate and able manner. One aspect of that pertains to cables credible on the credible of ceilings and sidewalls. You acquire to abutment these by the structural apparatus of the architectonics in such a address that accustomed use won’t accident the cable. You acquire to defended a cable in a address that doesn’t accident it (see Bulk 770-7 un770-07 770-08.cdr). If you install cables next to framing members, you acquire to assure them from accurate accident via assimilation by screws or nails. This requires a 1-1/4 in. breach from the framing affiliate or a acceptable metal bowl per 300.4(D).