What kinds of hand-held power tools are there?

1, a kind of tool. In the aspect of electric shock protection, neutral protection is adopted besides basic insulation; Class I tools adopt metal shell, and the power supply part has insulation performance, which is suitable for dry places;

2. The second kind of tools. The tool itself has double insulation or reinforced insulation, and no measures such as protective grounding have been taken; Class II tools not only have insulation performance in the power supply part, but also have insulation performance in the shell, that is, they have double insulation performance. The nameplate of the tools is marked with the word "back", which is suitable for wet workplaces.

3. Class 3.III tools. The power supply is provided by the safe ultra-low voltage power supply, and no voltage higher than the safe ultra-low voltage is generated inside the tool; Ⅲ Tools are powered by safe voltage power supply, which is suitable for particularly humid workplaces and working in metal containers.

Extended data:

Attention should be paid to the following items when using:

1. Class II tools are selected for general places. If class I tools are used, leakage protectors and safety isolation transformers must be used. Otherwise, users must wear insulating gloves, insulating boots or stand on an insulating table (mat).

2. When working in a damp place or on a metal frame, use secondary or tertiary tools. If I tool is used, a leakage protector with rated leakage action current not greater than 30mA and action time not greater than 0. 1s must be installed.

3, in narrow places (such as boilers, metal containers, metal pipes, etc. ) Class III tools should be selected. If Class II tools are used, a leakage protector with rated leakage current not exceeding 15 mA and action time not exceeding 0. 1 sec must be installed.

4, special environment, such as hot and humid places, outdoor (rainy and snowy days), places with dangerous or corrosive gases, the electrical tools used should meet the safety technical requirements of the corresponding protection level.

5. The power cord of Class I tools must use three-core (single-phase tools) or four-core (three-phase tools) multi-strand copper-core rubber sheath line, in which the yellow-green double-color wire can only be used as protective grounding or neutral wire under any circumstances.

6. The safety isolation transformer of the third kind of tools, the leakage protector of the second kind of tools, the control boxes and power adapters of the second and third kinds of tools should be placed outside and supervised by special personnel.

7. Before use, check whether the tool shell and handle are broken or damaged, whether the grounding is correct, whether the wires and plugs are in good condition, whether the switch works normally and flexibly, whether the electrical protection device and mechanical protection device are in good condition, and whether the rotating part of the tool is flexible.

8. When using electric tools, it is forbidden to use hand-held wires or rotating parts of tools. During use, the wires must be prevented from being twisted, damp, heated or damaged.

9. It is forbidden to insert the wire core directly into the socket or hang it on the switch.

10, insulation resistance: class II is not more than 2Ω, class I is made of alloy shell 2Ω, class II is made of plastic shell 2Ω, and class III is powered by safe ultra-low voltage power supply, and no voltage higher than safe ultra-low voltage is generated in the tool.