Arrange too dense, building cable installation, ventilation cooling effect is not good, or cable near too close to other sources of heat, affected the normal heat dissipation of the cable, may also cause cable heating phenomenon in running. Joint manufacturing technology is bad, no pressure to close, cause whenelectrified resistance is too large, also will cause the cable to produce hot phenomenon. And cable insulation is not good, cause the insulation resistance is small, also can produce in the operation of the heating phenomenon. The armored cable, local sheath damage cause slow damage to insulation performance, after the water gradually reduce insulation resistance, can cause heating phenomenon in the operation of the cable. Power cable produce heating phenomenon, if you don't find out why timely troubleshooting, continuous electric cable to continue after the operation will produce heat insulation breakdown phenomenon.Cable causing interphase short circuit trip phenomenon, serious may cause fire.