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Answer for USA, Canada and countries running a 60 Hertz supply service.A dedicated circuit of #14 copper wire fed from a 15 amp single pole breaker is all that is needed for a dishwasher.

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on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized

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Q: Which size wire and breaker do you need for a dishwasher?
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