Fire-resistant cable refers to the cable that can keep safe operation for a certain period of time under the condition of flame combustion. Chinese national standard GB 12666.6 (IEC33 1 etc. ) The fire resistance test is divided into two grades: Class A flame temperature is 950~ 1000℃, continuous fire supply time is 90min, Class B flame temperature is 750~800℃, and continuous fire supply time is 90 min. During the whole test period, the sample fire-resistant cables should be widely used in high-rise buildings, underground railways, underground streets, large power stations, important industrial and mining enterprises and other places related to fire safety and fire rescue, such as power supply lines and control lines of emergency facilities such as fire-fighting equipment and emergency indicator lights.