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某些施工人员对电动施工机具的保护接零和保护接地认识不够,通常以为电动施工机具做了保护接零和保护接地以后,就可以万无一失、绝对安全了。其实,接零、接地保护还存在以下几方面的缺陷。1.不能保护人体直接触及相线造成的触电事故,如手触摸到台灯裸露螺口处而造成的触电伤亡事故等。2.不能监视设备绝缘电阻状况,如设备绝缘电阻降低造成的漏电及由
Some construction workers do not know enough about the protection of the electric construction equipment and the protective grounding. It is generally believed that after the electric construction equipment is protected and grounded, it will be absolutely safe and absolutely safe. In fact, the zero and ground protection still have the following defects. 1. Can not protect the human body from direct contact and the electric shock caused by the phase line, such as the hand touched the desk lamp exposed bare mouth caused by the electric shock casualties and so on. 2. It is impossible to monitor the condition of the insulation resistance of the device, such as the leakage caused by the reduction of the insulation resistance of the device and