Insulation in electrical apparatus Insulator (electricity)

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all portable or hand-held electrical devices insulated protect user harmful shock.


class 1 insulation requires metal body , other exposed metal parts of device connected earth via grounding wire earthed @ main service panel—but needs basic insulation on conductors. equipment needs pin on power plug grounding connection.


class 2 insulation means device double insulated. used on appliances such electric shavers, hair dryers , portable power tools. double insulation requires devices have both basic , supplementary insulation, each of sufficient prevent electric shock. internal electrically energized components totally enclosed within insulated body prevents contact live parts. in eu, double insulated appliances marked symbol of 2 squares, 1 inside other.








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