Due to the special nature of other properties, fire-resistant cables are mainly used in the power supply circuits from emergency power supply to the user's fire-fighting equipment, fire alarm equipment, ventilation and smoke exhaust equipment, running lights, emergency power sockets, emergency elevators, etc. the staff must pay attention to the following problems when installing fire-resistant cables:

　　1. When fire-resistant cables are used in cable tunnels and cable interlayer with dense cables, or in flammable places such as oil pipes and oil depots, class a fire-resistant cables shall be selected first. In addition to these conditions, when the number of cables is small, class B fire-resistant cables shall be selected.

　　What should be paid attention to when installing fire-resistant cables?

　　2. Fire resistant cables are mostly used as the power supply circuit of emergency power supply, which requires normal operation in case of fire. As the ambient temperature rises sharply in case of fire, in order to ensure the transmission capacity of the line and reduce the voltage drop, the section of the fire-resistant cable shall be enlarged by at least one gear for the circuit with long power supply line and strictly limited allowable voltage drop.

　　3. Fire resistant cables cannot be used as high temperature resistant cables.

　　4. In order to reduce the failure probability of cable joints in fire accidents, the number of joints shall be reduced as much as possible during installation to ensure that the line can work normally in fire. If branch wiring is required, the joint shall be subject to fire protection treatment.