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Old 08-27-2010, 10:08 AM   #1
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Basic question about panels

Help me out here. I have 200 amp service. I have a 100 amp sub panel coming off main panel. When I add up the breakers in the main they are greater than 200 and when I add up the breakers in the sub they are greater than 100? however no tripped breakers. I am thinking that if ALL circuits were in use I would trip a breaker? I suppose my question is how can I have a 200 amp panel but the total amps for all breakers together is more than 200
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Old 08-27-2010, 10:14 AM   #2
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Adding up the handles has nothing to do with the actual load each breaker is carrying at any one time. It also does not take into account items like air conditioning and heat that are not used at the same time. A 20 amp countertop receptacle circuit may only power the coffee maker clock most of the time. You should have 2 of these circuits, but are not using anywhere close to 40 amps. The same applies for other circuits in your house.
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 08-27-2010, 10:48 AM   #3
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I have a 200a main, (2) 100a subs & a 60a sub
If I add up all my breakers it comes to ~1500a maybe

What you do is a whole house calc to determine overall electric use
My whole house calc comes in at 142a
That includes 2 full kitchen setups, hot tub, pool pump plus more

See this thread for an excel spreadsheet whole house calc

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