Optical fiber, nonconductive, riser (OFNR) is a type of optical fiber cable. As designated by the National Fire Protection Association (NFPA), this name is used for 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.

Related abbreviations

Underwriters Laboratories defines the following related abbreviations :

• 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, riser
• OFNR: Optical fiber, nonconductive, riser