Each 20 amp breaker is sized to protect the wiring connected to the breaker, guaranteeing that you will not pull more than 20 amps on the single circuit and cause that circuit wireing to overheat. Lets assume that you are running two ACs, microwave, water heater, TV, and coffee maker all at the same time. Each individual branch circuit that you are using is pulling a certain amount of amps with non of then pulling more than the individual branch circuit breaker is rated for. But, when you add the total amps being used by all the branch circuits together, it may well be 30 or even 50 amps in total. Did I explain this right guys?
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