I have a dedicated run for RV. I have a 30A breaker, romex 10/2 W/G and a 30A RV receptacle. I connect with a 30 to 50 amp receptacle. I can run one A/C all day with no problem. Wiring and connectors stay cool. Wouldn't try both A/Cs though.
PS: 10 gauge is 30 amp rated not 12 or 14 gauge.
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