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
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
Will a 6-gauge wire be big enough for a 60 amp breaker? - Quora
Can 15 Amp Outlets Be Used On A 20 Amp Circuit Breaker - YouTube
Wiring One-and Two-Pole Breakers - Fine Homebuilding