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electrical - How to determine if a 20 amp breaker can be upgraded to 30 amp - Home Improvement Stack Exchange
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electrical - Can I use a 20 amp breaker in the situation of having 15 amp wire connected to a 20 amp main wire? - Home Improvement Stack Exchange
What gauge wire is needed for a 20 amp circuit? Is it okay to use a 12-gauge wire on a 20-amp circuit? - Quora
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How to wire a 20 amp 240 volt circuit breaker | Electrical wiring, Home electrical wiring, Electrical wiring diagram
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