Should something happen and the heater draw more than 30amps, you might then have a problem but the heater itself should have its own protections against over pulling. For example, you could have, in the subpanel, a 50 amp breaker for the welder, a 40 amp breaker for the EV charging station (thats 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. In this case if your 30amp heater were to pull the max, then you would be running at 100% of the rating. If the heater is rated for 30 amps and you put a 30 amp breaker on there, then you are at a highly slighter risk as it is generally recommended to not exceed 80% of the breakers rating. In this case if the wiring is rated for 50amps, I would put the 50amp system back on there. Think of it like this, the device will only draw as much amperage as it needs so as long as you stay below the max for the circuit then you are ok. Typical application for a double pole 50A circuit breaker is to feed our HomeLine Spa Pack for GFI. This is what allows you to plug in, for example, five different devices into one circuit as long as the combination of those devices do not exceed the total amperage of the circuit. Provides overload and short circuit protection (240Vac). Some industrial electric stoves need a 60 amp breaker, while older ones can get away with 30 amp breakers. The majority of devices that you plug in will be less amperage than the circuit provides and this is kind of the point. Most 240-volt electric stoves require a 50 amp double-pole circuit breaker with a 8 gauge copper wire or 6 gauge aluminum wire. I purchased a 240V heater but it is rated at 30A and has a NEMA 6-30 plug on it. I would like to use this source for an electric heater. ![]() I believe the previous owner used this for an arc welder. Putting a higher amp device on a lower amp circuit = might be a problem 240V, 30A heater on a 240V, 50A circuit kevder 16 years ago Hi, I have a 240V, 50A outlet (NEMA 6-50R) in my garage. Putting a lower amp device on a higher amp circuit = Not a problem.
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