Adding excessive breakers to box

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Old 06-16-09, 11:31 AM
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Adding excessive breakers to box

I have a breaker box that has a 100amp main breaker. Also connected are a 20 amp breaker, and a 50 amp breaker for an RV hookup. I was planning on adding more outlets and thus more breakers. The problem is that I rarely use the 50 amp hookup, and typically leave it off. Is it possible to install a higher total of amps for the breakers than the main breaker and still be able to run it safely, assuming I keep the 50 amp turned off?

I.e., could I attach three more 20 amp breakers to the 100 amp box with one 20 amp and one 50 amp (a total of 130 amps), assuming the 50 amp breaker is turned off (presumably equaling 80 amps)?

Thank you.
 
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Old 06-16-09, 11:35 AM
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Adding the ratings of the breaker handles is not an accurate way of determining if the panel can serve the additional loads. If you were to look at a 200 amp panel the breaker handles might add up to 600-800 amps.

The correct way would be to do a demand load calculation.
 
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