This is probably obvious but I need some help.....

[threephase]

Say for instance you have a 200 amp service coming into a dwelling. Is there anything in the codebook stating that the total amperage of all the circuit breakers combined can equal a certain amount? In other words, do all the circuit breakers combined need to be 150 -200% of the total main?

The only thing I've seen is that there can only be a maximum of 42 overcurrent devices. (408.35)

In other words if you have a 200 amp main panel, in theory could you load up the panel with a total combined amperage of 300 with all your breakers combined?

 

[George Stolz]

In other words if you have a 200 amp main panel, in theory could you load up the panel with a total combined amperage of 300 with all your breakers combined?

Yes, provided your calculated load does not exceed 200A for the service.

 

[iwire]

I agree with George.

All that matters is the calculted load.

 

[roger]

I agree too. You could actually have a face value of branch circuits well over 300 amps in your scenario.

Roger

 

[threephase]

Thanks so much guys.

So if I make my computations using the standard or optional method for a dwelling, after demand factors are applied as long as the total connected load is less than the main, then I should be within code?

I appreciate the help.

 

[George Stolz]

That's correct.

Do try to take 90.1(B) into consideration, and keep future use in mind as you proceed.