Sizing breaker for Sub-Panel properly

Old 09-13-16, 08:21 AM
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Sizing breaker for Sub-Panel properly

I initially asked this in another thread, hope the new thread will pull more attention.

I have a 30 amp breakers feeding a pretty loaded sub-panel (see below). Sub-panel feeds basement lights, attic and individual appliances in the kitchen (fridge/microwave/incinerator) .

I am almost 10 years in this house and never had the 'main' breakers tripped so that the question is rather about any rules that may require a different setup.

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Old 09-13-16, 12:23 PM
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The rules that govern panel sizing are called "demand load calculation". The code spells out numerous rules, but if you search for that term you'll find several online calculators to help figure it out. My gut feeling is that a 30A feeder (7200W) is likely a bit small for the listed loads, but we can only know if it's a code issue by doing the calc.

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