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It is the minimum required to complete a circuit. You need a live and neutral.

A two pronged plug does not have a saftey Earth connection. The device operated must be double insulated and have no metal parts visible, that could become live.

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Q: Why are there 2 prongs on a plug?
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Why are the metal prongs of a plug sealed in plastic and rubber?

why are metal prongs of a plug sealed in plastic and rubber


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