The cable insulation wrap should be done with high-voltage waterproof tape for protection when the humidity is low to avoid the security risks caused by the residual moisture during the wrapping.

This thesis focuses on the research and development of the insulation resistor measuring for low-voltage wire and cable. The first part of the thesis has a review-like character.

Y series three phase induction motor (380v IP23) is low voltage motor for normal use. The basic protection class are IP23, insulation class is b.