A three-pin, alternating current (AC) power adaptor has three wired contacts where one of the contacts is live, the other is neutral and the third is the ground contact. The live contact carries the current, the neutral returns it and the ground provides protection against device insulation failure.
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A black wire is usually connected to the live contact, sometimes it is a red wire.
A white wire will usually lead to the neutral contact, although sometimes it is a blue wire.
The ground contact is identified by a green wire; alternatively, it may be green and yellow.
Different countries and regions of the world use different colour codes, but the standards remain the same. The United States and Japan use the black, white, green colour codes for the live, neutral and ground pin connections respectively, while Europe and the UK use brown, blue, green/yellow colour codes, respectively.
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