Can you replace a 15A circuit breaker with a 30A breaker?

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I believe that the wires supplying a 30 amp circuit must be at least 10 gauge. If you have 14 or 12 gauge wires going to or from your 15 amp breaker, then drawing 30 amps over it could cause a fire hazard. It's like using those cheapo non-UL certified extension cords to plug a MILLION X-mas lights into (drawing more power than the wires can handle). You also have to make sure this GFI outlet you refered to is rated for 30 amps.

Do not simply swap out breakers. Overloading the wires in the circuit protected by that breaker will cause a fire.

If you need a 30 amp circuit you must run #10 gauge wire.
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