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Mains electricity, typically a higher voltage AC waveform used to deliver electrical power to households. In North America 120V, 60Hz, in most European countries 230V, 50Hz. What most people will plug appliances into.

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What is "mains outlet tester" (for proper wiring) in the context of US power connector stand...

What is "mains outlet tester" (for proper wiring) in the context of US power connector standard? What extra LED indicates? Am I correct assuming what Japanese outlets are not testable at all? …
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