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Most residential service in USA has both. In the USA 110 to 120 volts is a given and it would be very unusual not to have 220 to 240 volts. It can be easily tested at main panel with a volt meter. Or as an alternative call your power company.

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12y ago
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10y ago

In most instances the size, shape and configuration of slots indicate the voltage. If not sure, test with a voltage tester.

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If a voltage tester is not available go to your distribution panel and find the source breaker that supplies voltage to the receptacle outlet. If it is fed with a single 15 amp breaker it is 120 volts. If the circuit is fed with a two pole 15 amp breaker then it is most likely a 220 volt receptacle outlet. A 120 volt receptacle outlet will have parallel blades whereas a 220 volt receptacle outlet will have tandem blades on a 15 amp circuit.

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Q: How can you determine if you have 110 or 220 volts?
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