In terms of protection against electric shock, the tool not only relies on basic insulation, but also includes an additional safety precaution. The method is to connect the accessible conductive parts with the protective (grounding) conductor in the installed fixed line, so that the accessible conductive parts do not become electrified in the accident of basic insulation damage.

Its rated voltage exceeds 50V. In terms of protection against electric shock, the tool not only relies on basic insulation, but also provides additional safety precautions for double insulation or reinforced insulation, and measures without protective grounding or depending on installation conditions. The shell of this kind of tool can be divided into metal and non-metal, but the handheld part is non-metal, and the non-metal part is marked with "back" symbol.

The rated voltage shall not exceed 50V. It is powered by ultra-low voltage power supply, and no voltage higher than safety ultra-low voltage is generated inside the tool. The shells of these tools produced by Dalian hollow forming factory are all plastic.