Double insulation refers to both basic insulation and additional insulation, which is characterized by no need for ground protection, applicable to Class II appliances and tools. Electrical equipment can be used in addition to the basic protective measures, refers to both basic insulation and additional insulation insulation structure. Double insulation refers to both working insulation and protective insulation insulation, the former is a charged body and the inaccessible conductor between the insulation, the latter is the inaccessible conductor and the inaccessible conductor between the insulation is used to prevent electric shock when the working insulation is damaged insulation.
Double insulation is a class II electrical appliances, the use of stator additional insulation and rotor additional insulation of these two structures, these two forms of insulation, the rear bearing of its power tools must be placed on the plastic parts.