Features of FR wire and cable
Fire-resistant cables refer to cables that can maintain safe operation for a certain period of time under flame burning. Fire-resistant cables are widely used in high-rise buildings, underground railways, underground streets, large power stations and important industrial and mining enterprises, and places related to fire safety and fire rescue. For example, power supply lines and control lines of emergency facilities such as fire fighting equipment and emergency guide lights.

Use conditions of fire-resistant cables
1. AC rated voltage: U. /U (V series: 600/1000V, K series: 450/750V, B series: 450/750V).
2. Maximum long-term working temperature of the cable
(1) Polyvinyl fluoride insulation and sheath: 70℃ and 105℃; XLPE insulation: 90℃;
(2) Fluoroplastic insulation and sheath: 220°C and 260°C; Fluoroplastic insulation and 105°C flame-retardant polyvinyl fluoride sheath: 90°C and 125°C.
(3) Low-halogen, low-smoke, flame-retardant PVC insulation and sheath: 70℃;
Halogen-free low-smoke flame-retardant polyolefin insulation and sheath: 90°C and 125°C.

3. The lowest ambient temperature:
(1) Flame-retardant PVC insulation and sheath: fixed laying -40℃;
Non-fixed laying -15℃;
(2) Fluoroplastic insulation and sheath: fixed laying -60℃;
Non-fixed laying -20℃;
4. The safe laying temperature of cables should not be lower than 0℃.
5. Fire resistance characteristics:
Comply with GA 306.2-2007, GB/T 19216.21-2003 regulations
Flame temperature: 　 flame temperature 950℃-1000℃, 　 flame temperature 750℃-800℃
Burning time: 　 Burning time 90min (recommended)
Additional voltage: 　 rated voltage (minimum 100V)
Fire resistance class: 　 Class A (Class IA~Class IVA), 　 　 　Class I~IV

6. The recommended allowable bending radius for laying: non-armoured, braided shielded cables should not be less than 6 times the outer diameter of the cable;
The steel tape armored cable should not be less than 12 times the outer diameter of the cable;
Fluoroplastic insulation and sheath material cables should not be less than 8 times the outer diameter of the cable.