OFNR

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OFNR is an abbreviation for Optical Fiber, Nonconductive, Riser.

OFNR is the designation and required marking given by the National Fire Protection Association (NFPA) to interior fiber-optic cables which contain no electrically conductive components, and which are certified for use in riser applications; they are engineered to prevent the spread of fire from floor to floor in a building. Typically they are tested for compliance with ANSI/UL 1666-1997, Standard Test for Flame Propagation Height of Electrical and Optical-Fiber Cable Installed Vertically in Shafts. NFPA NEC 2005 Art 770.51(B) FPN.

They are distinct from optical plenum cable, and general purpose optical cable.

[edit] Related abbreviations

Underwriters Laboratories defines the following related abbreviations [1]:

OFC 

Optical Fiber Conductive

OFN 

Optical Fiber Nonconductive

OFCG 

Optical Fiber Conductive General Use

OFNG 

Optical Fiber Nonconductive General Use

OFCP 

Optical Fiber Conductive Plenum

OFNP 

Optical Fiber Nonconductive Plenum

OFCR 

Optical Fiber Conductive Plenum