(1) When fire-resistant cables are used in cable-intensive cable tunnels, cable mezzanines, or in flammable places such as oil pipes and oil depots, a Class A fire-resistant cable shall be used first. In addition to the above circumstances and the number of cables less configuration, the use of Class B fire-resistant cables.

(2) Most of the fire-resistant cables are used as the power supply circuit of the emergency power supply and require normal work in the event of a fire. Due to the rapid increase of ambient temperature in case of fire, the cross section of fire-resistant cable should be enlarged by at least one degree for circuits with long supply lines and strictly limited voltage drop to ensure the transmission capacity of the lines and reduce the voltage drop.

(3) Fire-resistant cables can not be used as high-temperature cables.

(4) In order to reduce the probability of cable connector failure in a fire accident, the number of connectors should be reduced as much as possible during installation so as to ensure that the circuit can work normally during a fire. If you need to do the branch wiring, deal with the connector fire prevention.