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How many watts does it take to trip a 20 amp breaker?

You have 20A 120V or 2400 watt for 20AMP, 15A 120V or 1800 watt for 15AMP, and 15A* 120V or 1800 watt for 15AMP. Good Electricians use 80% of the circuit and leave a 20% safety margin so you have 1920 and 1440 watt per circuit.

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