That is one of the few situations the NEC allows the receptacle and breaker to not match exactly. Generally even if factory supplied with a 15A plug I would use a 20A circuit with a duplex receptacle. You would need to consult the owners manual for the compressor for voltage and amperage. The RV would need a neutral, so a NEMA 14-50 would be required. The largest receptacle recognized by NEMA is 50A, the welder and EV charger typically don't need a neutral, so the configuration would be a NEMA 6-50. It's possible some nit-picking could get you down to 70A fed by #6 in 3/4" conduit, but I think once you consider labor and possible future needs you would find that to be a fools errand. The extra cost is minmal and extra breaker space is never bad. (You may want to consider 1.25" PVC.) I likely would use a panel larger than 100A, you don't need to feed it with the full rated capacity. A 125A or larger feeder and panel may be needed if you need to feed more than one 50A circuit, but once you get into feeders 125A or greater you start running into service size and load calc problems.įor 100A I would run 3 copper THWN #3AWG and #8AWG ground in 1" Sch40 PVC. I don't see how you could get by with less than a 100A panel. In the US the NEC generally only allows one feeder per building so the new feeder would be required to pick up all existing loads to replace the existing feeder including a lighting circuit and a required 120v 20A receptacle circuit. Also, some of your items may be required to have larger circuits. It might turn out that the code requires a larger feed. Note: I am not an electrician and so I may have simplified some things. I'd actually suggest that you run a 100 amp circuit to the sub panel to give you some breathing room so if you end up with, for example, an 80 amp Tesla charger, you don't have to replace the feed wires. You could also start with just the 50 and the 15 and add the others as needed. If you were to exceed 50 amps total at any time, you'd trip the feeding breaker. Also, assuming you didn't want to run multiple devices at once, you could even size the feed wires (and the feeding breaker in the main panel) for the largest device only.įor example, you could have, in the subpanel, a 50 amp breaker for the welder, a 40 amp breaker for the EV charging station (that's enough unless you get a Tesla), a 30 amp breaker for the RV and a 15 amp breaker for the compressor, all fed from a 50 amp circuit. The proper way is to install a sub panel in your garage with separate breakers and outlets for the different amperage devices. If your compressor developed a fault where it was drawing 30 or 40 amps (not a dead short), the breaker would not trip but the cord on the compressor or the motor in the compressor could overheat and catch fire! One thing the other answers have not stated is that the US electrical code does not allow you to plug a 15 amp device into a 50 amp outlet.
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