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Double-insulated appliances are common around us. The air purifiers in our classroom are one good example.
In these appliances, only two wires are needed, namely Live and Neutral wires. Earth wire is not required as the casing is made of insulator like plastic for this case.
The classic air purifier in our classroom
The “double squares” symbol means that this appliance is double-insulated.
As you see, the earth wire is not required.
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