1) local insulation itself is flawed;
2) insulation thickness is not enough;
3) conductive wire core surface of burrs, sharp corners and sharp edges, bumps, welding points not firm or wire fracture cause electric field concentration;
4) metal sheath (or metal shielding) fracture or convex surface, not only causes electric field concentration;
5) the bending or compression, bump, mechanical damage, and damage to the insulation;
6) copper strip steel strip itself, such as edge or have burr and stabbed insulation.
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