Safety devices

1 mark · Easy

What does double insulation in an electrical appliance mean?

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Correct option: There are two protective layers of insulation around live parts

Common mistakes: The appliance has two layers of metal casing

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Marking points

B1 · 1 mark · Selects correct meaning of double insulation.

Worked solution

There are two layers of insulating material between the user and live parts, so no earth wire is needed.