Why hand grinding sand turbine, electric drill, impact drill and other power tools plug is two, plug is not three plug
In recent years, leakage protection performance and the reliability greatly, has become a standard power supply, reliability of human protection over ground protection to a certain extent, but the impact of grounding protection and leakage protection to human body protection, so many hand-held electric tools to cancel the earthing protection, relying instead on leakage protector. And use the two eye plug.Look at the instructions for the hand-held power tools with two plugs. All require that the power supply be equipped with an electric leakage protector.
Hand-held power tools, in the past there are many plugs with three eyes, the purpose is that in case the leakage can pass through the grounding wire, the current will be introduced into the earth, and the protection of the human body.In practical applications, because of the mobile work and the use of temporary power supply, and the grounding of the sockets in many places is not reliable, it is not ideal to implement the leakage protection by grounding.
Each of these devices has a "back" logo indicating double insulation protection, and the double insulated layer forms insulation protection between the outer shell and the inner part of the tool, thereby preventing the occurrence of electric shock. So no three plug in,
