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I feel like I'm missing something obvious. I know different plug styles are used based on a circuit's amperage (in the US) but is the same style of plug used for both 110V and 220V outlets of the same amperage?

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It's not clear what you mean by "connectors"? Do you mean the plugs that are used, or the wire nuts that are used to connect wires together? –  Eric Gunnerson Apr 16 '13 at 3:54
    
@EricGunnerson I'm asking about the prong configuration of plugs/outlets –  Brad Mace Apr 16 '13 at 4:22
    
Also, if you're asking if there exists a plug/receptacle that could be either 120 or 240, depending on the whim of the installer, the answer is no, any particular plug is either standardized at 120 or 240. –  Aaron Apr 16 '13 at 12:30
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1 Answer

up vote 7 down vote accepted

No, the plugs are different for different voltages. There are many different NEMA receptacles for various combinations of voltage and current, and also a "twist-lock" receptacles. Some common ones are:

Common NEMA plugs

(From Wikipedia).

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The grid with everything oriented the same way makes it a lot easier to spot the differences, thanks. –  Brad Mace Apr 16 '13 at 13:30
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