OFNR designates optical fiber nonconductive riser cable, an all-dielectric fiber optic cable rated for vertical riser runs between floors, with fire performance that limits flame spread.
OFNR designates optical fiber nonconductive riser cable, combining the all-dielectric nonconductive optical classification with a riser rating. Riser-rated cable is built to limit the spread of flame from floor to floor, suiting it to the vertical pathways that run between the floors of a building. This fire performance is higher than general purpose but below the strictest plenum requirements.
Because vertical riser shafts can act as channels for fire to travel between floors, cable installed in them must resist propagating flame along its length. The OFNR designation identifies nonconductive optical cable that meets the riser fire-performance requirement, making it appropriate for the between-floor runs that connect a building's fiber communication systems.
In commercial and industrial facilities, optical fiber nonconductive riser cable carries fiber communication through vertical pathways with an all-dielectric construction while meeting flame-spread requirements. Selecting the correct class for both the nonconductive type and the location is part of building a compliant fiber system.
Because a riser shaft can carry fire between floors, the flame-spread performance behind the riser rating is essential, making OFNR the appropriate all-dielectric optical choice for the vertical between-floor runs that connect a building's fiber networks.
At Windy City Wire, the focus on fiber optic cable for commercial communication includes riser-rated classes like OFNR. Supplying cable carrying the appropriate designations helps commercial facilities apply the right optical product for between-floor riser runs.
OFNR (Optical Fiber Nonconductive Riser cable)
NEC (National Electrical Code), which defines riser optical fiber cable requirements