汉信
Typically, there are eight levels of fire resistance for both non-conductive and conductive cables specified by NEC (National Electrical Code). All indoor fiber optic cables must be marked and installed properly for its intended use: plenums, risers and general purpose areas.
Note:
(1) A Plenum area is a building space used for air flow or air distribution system (drop ceiling and raised floors).
(2) A Riser area is a floor opening, shaft or duct that runs vertically through one or more floors.
(3) A general purpose area is all other area that is not plenum or riser and on the same floor.
| NEC Code | Description | Cable Application | Possible Substitute |
|---|---|---|---|
| OFNP | Optical Fiber Non-conductive Plenum Cable | Plenum, overhead, fiber only | / |
| OFCP | Optical Fiber Conductive Plenum Cable | Plenum, overhead, hybrid (fiber/wire) | / |
| OFNR | Optical Fiber Nonconductive Rise Cable | Riser, backbone, fiber only | OFNP |
| OFCR | Optical Fiber Conductive Rise Cable | Riser, backbone, hybrid | OFCP |
| OFNG | Optical Fiber Nonconductive General-Purpose | General purpose, horizontal | OFNP, OFNR |
| OFCG | Optical Fiber Conductive General-Purpose | General purpose | / |
| OFN | Optical Fiber Nonconductive | General purpose, horizontal, fiber only | OFNP, OFNR |
| OFC | Optical Fiber Conductive | General purpose, horizontal, hybrid | OFCP, OFCR |
