What are the causes of overheating in the use of wire and cable?

I. Wire and cable in the use of what overheating causes?1, wire and cable in the joints crimping is not tight, resulting in excessive resistance at the joints, long time power may make the wire and cable overheating; 2, in the design, planning and installation of wire and cable is not well thought out, the choice of wire and cable conductor resistance does not meet the wire and cable, when the energizing current is greater than the large negative current will cause overheating phenomenon; 3, the cable selection type Improper, resulting in the use of the cable conductor cross-section is too small, transit overload phenomenon, after a long period of time, the cable's heat and heat imbalance caused by overheating phenomenon; 4, due to the unprofessional installation personnel, cable installation is too densely arranged, the ventilation and heat dissipation is not good, or the cable is too close to other sources of heat, which affects the normal dissipation of heat from the cable, but also may result in the operation of the cable to produce overheating phenomena 5, cable insulation between phases is not good, resulting in insulation resistance is small, transit will also produce overheating phenomenon; 6, armored cable local sheath damage, water on the insulation performance caused by slow damage to the role of the insulation resistance is gradually reduced, but also cause the cable operation in the production of overheating phenomenon; 7, a lot of poor-quality wires and cables insulation is not good, resulting in insulation resistance becomes small, long-time operation will produce Overheating phenomenon; 8, the choice of wire and cable model selection is not appropriate, such as in high temperature or flammable environment should choose fire-resistant wire and cable.

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