What kind of power tools are hand drills? 1, 2 or 3?
In the prevention of electric shock protection, in addition to relying on basic insulation, but also the need for zero protection.
Powered by a safety extra low voltage supply, no voltage higher than the safety supply voltage is generated within the tool.
The tool itself has double insulation or insulation without the need to protect the ground.
The above is the classification of insulation categories.You can see the cable plug, the aluminum shell is inserted three I tools, is grounded, the aluminum shell and some II tools, because it has a plastic insulation between the stator and the aluminum shell, so it is the installation of two wire plug.
