No, not by default. A 60-amp breaker is the usual branch-circuit size for a 48-amp continuous EVSE (48 × 1.25 = 60). Many homeowners do not need 48-amp charging overnight. Electricians in the r/askanelectrician thread about a 60-amp breaker on a 100-amp service made that point repeatedly: do a load calculation, and consider a 40-amp circuit (32-amp charging) first.
A 48-amp charger is a 11.52 kW continuous load — comparable in power, if not in duration, to a large electric appliance. On the all-gas 1,800 ft² educational example, a 48 A EVSE calculates to about 77.4 A. That can still be under 100 A in a lightly loaded house, and it is much easier on 150 A or 200 A, but it is the wrong starting assumption for a short commute.
Ask what the car’s onboard charger will actually draw, how many miles you need overnight, and what the load calculation shows. Then use the calculator. A 60-amp circuit also needs two adjacent breaker spaces and conductors sized for that circuit — another reason “just put in 60 amps” is a service question, not a preference.
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