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Can you have two breaker boxes?

You can buy tandem circuit breakers where both sides are 20-amp breakers, either side is 15-amp and the other side is 20-amp, or both sides are 15-amp and the other side is 20-amp. You gain an extra circuit in the electrical panel by removing a standard 20-amp breaker and replacing it with a tandem unit that has two 20-amp breakers.

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