HerdingElectrons
Well-known member
@cwerdna & others I totally get the concern about using a NEMA 14-50 on a 40A circuit breaker when technically the receptacle is rated for 50A.
Practically speaking the odds of someone plugging in a electric oven or a welder are the primary other possible appliances & both are very unlikely scenarios and if a welder is to be employed then said person would likely have enough knowledge of residential wiring to know they needed bigger wires to support the greater amperage draw.
To address your question/concern about a 40A Tesla UMC being plugged in; the breaker would trip from an over current because too much amperage was being drawn on the circuit which would lead to a technically competent person(homeowner &/or electrician) to determine bigger wires are needed or you could simply adjust your Tesla home charging UMC EVSE to 32A & all would be perfectly safe & happy albeit a slightly lower charge that practically speaking is irrelevant in day to day use.
My point was simply there's perfectly safe ways to save some money while being safe because of the charge limitations of the car.
I love future proofing myself but I'm hoping that in 10 years we will be able to utilize 60-80A EVSE so the suggested 50A would be insufficient in that scenario. Or have some sort of home based Chademo/DC fast charger/Supercharger option if you need/want a quick 50-100 miles without waiting on L2 charge rates.
In summary charging a BEV at L2 at 32A equates to around 20-22 miles/hour of charging which is more than enough for all but the most extreme commuters & they are already in a 80kwh or greater car if they are using a BEV for that commute so greater than 32A charging IMO is moot.
Practically speaking the odds of someone plugging in a electric oven or a welder are the primary other possible appliances & both are very unlikely scenarios and if a welder is to be employed then said person would likely have enough knowledge of residential wiring to know they needed bigger wires to support the greater amperage draw.
To address your question/concern about a 40A Tesla UMC being plugged in; the breaker would trip from an over current because too much amperage was being drawn on the circuit which would lead to a technically competent person(homeowner &/or electrician) to determine bigger wires are needed or you could simply adjust your Tesla home charging UMC EVSE to 32A & all would be perfectly safe & happy albeit a slightly lower charge that practically speaking is irrelevant in day to day use.
My point was simply there's perfectly safe ways to save some money while being safe because of the charge limitations of the car.
I love future proofing myself but I'm hoping that in 10 years we will be able to utilize 60-80A EVSE so the suggested 50A would be insufficient in that scenario. Or have some sort of home based Chademo/DC fast charger/Supercharger option if you need/want a quick 50-100 miles without waiting on L2 charge rates.
In summary charging a BEV at L2 at 32A equates to around 20-22 miles/hour of charging which is more than enough for all but the most extreme commuters & they are already in a 80kwh or greater car if they are using a BEV for that commute so greater than 32A charging IMO is moot.
