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What is Double Insulation?


Some appliances have double insulation. These appliances only need live and neutral wires. They do not need an earth wire.

An appliance that is double insulated has the whole of the inside contained in plastic,
underneath an outer casing. If anything goes wrong with the appliance, no live conductor can touch the outer casing because of the insulating plastic.

Appliance showing Double Insulation

Appliances that are double insulated include TVs, computers, printers and hairdryers.

The symbol for double insulation is shown below. Symbol for Double Insulation

You will see this symbol printed on the appliance which is double insulated.

———From the Net, if infringement, I must delete the post.

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