What causes cables to heat up in operation?

Cable through a certain load current, it will be hot, with the increase of load current, the higher the surface temperature of the cable, if not dealt with in time, the consequences can be imagined. Such as: polyvinyl chloride (PVC) cable, is the core temperature of 70 degrees for the upper limit of consideration, the surface temperature will be lower 5 ~ 10 degrees. So the cable surface temperature below 60 degrees is basically safe, from power maintenance considerations, of course, the lower the temperature the better.

-I. What causes the cable to heat up in operation?1, the cable conductor resistance does not meet the requirements, resulting in cable heating phenomenon in operation.2, the cable selection type is not appropriate, resulting in the use of the cable's conductor cross-section is too small, the operation of the phenomenon of overload, after a long period of time, the cable's heat and heat dissipation imbalance caused by the phenomenon of heat.3, the cable is too densely arranged for the installation, the ventilation and heat dissipation is not effective or Cable close to other heat sources too close, affecting the normal heat dissipation of the cable, may also cause the cable in operation to produce heat phenomenon. 4, joints manufacturing technology is not good, crimping is not tight, resulting in excessive contact resistance at the joints, will also cause the cable to produce heat phenomenon. 5, the cable phase-to-phase insulation is not good, resulting in insulation resistance is small, the operation of the cable will also produce heat phenomenon. 6, the armored cable local sheath breakage. After entering the water on the insulation performance caused by the slow destruction of the role, resulting in a gradual decrease in insulation resistance, will also cause the cable operation of the heating phenomenon. Power cable heating phenomenon, if you do not find the cause of timely troubleshooting, the cable continues to run continuously energized will produce thermal breakdown of insulation. Causes the cable to trip the phenomenon of phase-to-phase short circuit, which may cause a serious fire.

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