> Just want to know some history about class II safety protection and appreciate > your sharing knowledge. > > Class II products have two levels of insulation: basic and supplementary > insulations. Each insulation is safe to prevent from electrical shock in > normal use. Why does a product need two levels of insulation in its lifespan? > How often is a second insulation being used? > > Nine out ten people do not know the meaning of class II symbol. What is main > purpose to have a double square symbol on class II products? > > Thanks and regards, > > Scott
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