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.
钢管口应先装上管螺母，以免穿线时损伤导线绝缘层。
2
This tester is to test the damaged degree of conductor or various materials of insulator caused by the specified voltage to ensure the security of usage of insulating material.