The recommended wire gauge for a 15 amp breaker is no.14, which is what I am planning to use. However, I might upgrade it in the future to a 20 amp or
Can I tap into an existing 12 gauge wire run on a 15 amp circuit (put in a junction box) and connect a 14 gauge wire to install an outdoor outlet? - Quora
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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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