How about plug wires and cables for power tools?
Class I tools are common type power tools with a rated voltage of over 50 volts. Class I tools not only rely on basic insulation but also include an additional safety measure in the protection against electric shock. The method is that the accessible conductive parts and protection has been installed in the fixed line in the (ground) wire together, make accessible conductive parts in the basic insulation does not become damaged in the charged body. Plug for three pin plug type tool.
Class II tools, that is, insulated structures, all double insulated power tools. The specified voltage is over 50V, and the grounding device is not allowed in class II tools. Generally insulated enclosures. Generally speaking, the design of II tools made use of personal protective equipment operator to some reliable method in the tool, the tool has a double protective current, guarantee in the fault state, when the basic insulation failure, insulation and reinforced insulation provided by additional electric shock protection.
Class II tools must be made of an insulated power plug, and the power plug is joined to a soft cable or cord to form a non renewable power plug. Class II tools only allow the use of non - renewable two pin power plug. The II class tools are marked with "back"". Class III tools, that is, secure voltage tools. Its rated voltage is not more than 50V, and the protection against electric shock depends on the power supplied by the safety voltage and no voltage higher than the safety voltage in the tool.
