ElectroTechnics
Serving Illawarra and Greater Sydney Test & Tag
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Class I

A Class I appliance has it chassis and/or other metal parts connected to the electrical earth with an earth conductor (green/yellow). When we perform an earth resistant test, we measure the resistance between the chassis and the earth pin of the plug.

test circuit for earth continuity resistance

Class II

A Class II appliance is electrical double insulated and its construction allows not having an earth conductor. All Class II appliances must have a double square (square in square) symbol on the data plate.

double insulation symbol

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