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Main outdoor breaker is ONLY 100 AMP but total of Breakers AMP on internal panel is 165 AMPs. From what I have read so far this still ok. I could have Subpanels/Feeder Panels down stream from the main breaker requesting more output but if the Main is unable to handle it then it should "flip off" correct?

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marked as duplicate by Niall C. Feb 19 '14 at 4:17

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

See the section Summing Up Breaker Ratings Means Nothing in this answer to the question, Do the breaker amp readings sum up to dictate my current panels total / possible amperage? – Tester101 Feb 18 '14 at 11:59

Synopsis: The sum of all the branch circuit breakers is a meaningless number.

The main breaker will "trip", or "flip off" as you say, when the current (amperage) load well exceeds it's rating for a predetermined amount of time. Meaning a breaker does not trip when the load is 1 or 2 more than the rating. The "continuous load" on the panel should not exceed 80%. In a residential application this is a hard number to pin down though.

As to your sub-panel question, a load calculation is the only accurate way to tell if your service is adequate to support any new loads on the service.

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