防止受潮损伤，以免影响绝缘等级。
Prevented is affected with damp, the damage, in order to avoid influence insulation rank.
电机轴承采用绝缘结构，减小了轴电流对轴承的损伤，提高了轴承寿命。
Insulation structure for bearing, reduce the damage from shaft current and improve the life of bearing.
钢管口应先装上管螺母，以免穿线时损伤导线绝缘层。
At first, pipe bolts should be erected at the nozzle so as to prevent the insulation coat of the conductor from being damaged while wiring.
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