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What's The Heat Of The Wire And Cable In Operation?
Jul 17, 2017

Wire and cable through a certain load current, will be hot, as the load current increases, the wire surface temperature higher, if not timely treatment, the consequences can be imagined. such as: PVC (PVC) wire, is the core temperature of 70 degrees for the upper limit, surface temperature will be low 5~10℃. So the wire surface temperature below 60 degrees is basically safe, from the power maintenance considerations, of course, the lower the temperature the better.

Power lines are running in the following reasons:
1, the wire conductor resistance does not meet the requirements, resulting in the operation of the wire in the heat phenomenon.
2, the improper selection of wire, resulting in the use of the conductor cross-section of the wire too small, the operation of the phenomenon of overload, the long time after use, the heat and heat of the wires caused by uneven heating phenomenon.
3, wiring installation is too dense, ventilation cooling effect is not good, or wire near other heat sources too close, affecting the normal heat of the wire, but also may cause the wire in the operation of the phenomenon of fever.
4, the joint manufacturing technology is not good, the pressure is not close, resulting in contact resistance is too large, will also cause heating wires.
5, wire insulation performance is not good, resulting in small insulation resistance, the operation will also produce heating phenomenon.
6, armored wire local sheath breakage, after the water to the insulation performance caused by slow damage, resulting in insulation resistance gradually reduced, will also lead to the operation of wire heating phenomenon.
Power lines after heating phenomenon, such as not to find the cause of timely troubleshooting, the wires continue to run continuously after electricity will produce insulation thermal breakdown phenomenon. Causes the electric wire to occur the short circuit tripping phenomenon, serious may cause the fire.