(4 ft 11 in.) when performing the CSA "Vertical Flame Test — Cables in Cable Trays," as described in CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables.
(D) Types OFN and OFC. Types OFN and OFC noncon ductive and conductive optical fiber cables shall be listed as being suitable for general-purpose use, with the exception of risers, plenums, and other spaces used for environmental air, and shall also be listed as being resistant to the spread of fire.
FPN: One method of defining resistant to the spread of fire is that the cables do not spread fire to the top of the tray in the "UL Flame Exposure, Vertical Tray Flame Test" in UL 1685-2000, Standard for Safety for Vertical- Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables. The smoke measurements in the test method are not applicable.
Another method of defining resistant to the spread of fire is for the damage (char length) not to exceed 1.5 m (4 ft 11 in.) when performing the CSA "Vertical Flame Test — Cables in Cable Trays," as described in CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables.
FPN No. 1: Cables types are listed in descending order of fire resistance rating. Within each fire resistance rating, nonconductive cable is listed first because it may substitute for the conductive cable.
FPN No. 2: See the referenced sections for requirements and permitted uses.
770.182 Optical Fiber Raceways. Optical fiber raceways shall be listed in accordance with 770.182(A) through (C).
(A) Plenum Optical Fiber Raceway. Plenum optical fiber raceways shall be listed as having adequate fire- resistant and low smoke-producing characteristics.
FPN: One method of defining that an optical fiber raceway is a low smoke producing raceway and a fire- resistant raceway is that the raceway exhibits a maximum peak optical density of 0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.52 m (5 ft) or less when tested in accordance with the plenum test in UL 2024, Standard for Optical Fiber Cable Raceway.
Table 770.179 Cable Markings
Cable
Marking Type Reference
OFNP Nonconductive optical 770.179(A) and fiber plenum cable 770.154(A)
OFCP Conductive optical 770.179(A) and
fiber plenum cable 770.154(A)
OFNR Nonconductive optical 770.179(B) and
fiber riser cable 770.154(B)
OFCR Conductive optical 770.179(B) and
fiber riser cable 770.154(B) OFNG Nonconductive optical 770.179(C) and
fiber general-purpose 770.154(C)
cable
OFCG Conductive optical 770.179(C) and
fiber general-purpose 770.154(C)
cable
OFN Nonconductive optical 770.179(D) and
fiber general-purpose 770.154(C)
cable
OFC Conductive optical 770.179(D) and
fiber general-purpose 770.154(C)
cable
(B) Riser Optical Fiber Raceway. Riser optical fiber raceways shall be listed as having fire-resistant characteristics capable of preventing the carrying of fire from floor to floor.
FPN: One method of defining fire-resistant characteristics capable of preventing the carrying of fire from floor to floor is that the raceways pass the requirements of the test for Flame Propagation (riser) in UL 2024, Standard for Optical Fiber Cable Raceway.