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This question is an exact duplicate of:

Main panel has one 100 double breaker and two 60 amp double breakers. There are extra slots for more breakers. Can I install a 30 am double breaker in on of the extra slots to wire up a 30 amp electric water heater with 10 gauge wire? Thank you.

marked as duplicate by BMitch May 24 '16 at 11:29

This question was marked as an exact duplicate of an existing question.

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You can. But your total electrical may now be too much. It depends on your service capacity.

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