Fiber cable jacket is made of various types of materials. It’s important to consider the jacket type when selecting the compatibility with the application’s connectors and environment.
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.
(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.
OFNP and OFNR are two types of fiber optic cables that are used in buildings. OFNP cables have fire-resistance and low smoke production characteristics. This is the highest fire rating fiber cable and no other cable types can be used as substitutes. So these cables are mostly installed in plenum areas. Whereas, the fiber-resistance and low smoke of OFNR cables are not good as OFNP. OFNP plenum cables can be used as substitutes for OFNR cables.
Fiber Optic Cables,
Patch Cords and Cabinets.
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