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Electric tools tell you the classification of

by:WORKSITE     2021-01-07
Impact drills and ordinary electric drills are both hand-held power tools. Such tools are divided into three categories according to the methods of electric shock protection.

Class I tools not only rely on their own basic insulation in terms of protection against electric shock, but also include additional safety precautions, such as the use of leakage protectors, safety isolation transformers, or the operator wearing insulating gloves and insulating shoes. 2MΩ insulation resistance is required between the live parts of class I tools and the shell (measured with a 500V megger, the same below).

Class II tools not only rely on their own basic insulation in terms of protection against electric shock, but the tools also provide additional safety precautions such as double insulation or reinforced insulation and are equipped with protective grounding or measures that depend on installation conditions. An insulation resistance of 7MΩ is required between the live parts of the Ⅱ tools and the shell. The obvious part of the tool is marked with the type II structure symbol 'Back'.

Class III tools rely on safe voltage power supply for protection against electric shock, so that no voltage higher than the safety extra-low voltage is generated inside the tool. Class III tools require an insulation resistance of 1MΩ between the live parts and the shell.
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