Up to 2,400 watts can be supported by a 20-amp breaker on a single circuit. The safe maximum for a 20-amp circuit is 1,920 watts since circuits shouldn’t be loaded to more than 80% of their maximum capacity for prolonged durations.
Long-term operation of a circuit at or close to its limit might warm up the wiring and connections and trip the circuit breaker. Appliances should be transferred to other circuits if a breaker trips frequently to lessen the load on the troubled circuit. Continuous overloading can cause damage and raise the danger of a fire.
