Future capacity percentage for panel board main breaker.

[Frank A]

I'm calculating the size of a main breaker for a dwelling unit panelboard. I've found that after adding all the load currents with their respective protection factor, the total must be multiplied by 133% for "future capacity".


So, 89.96A * 133% = 119.65A, as per 240.6 the breaker to be installed should be a 125A Inverse-time CB.


Is that true?


If so, which NEC article says so?

 

[petersonra]

Not a code issue. Code does not require any allowance at all for future possible loads.

 

[Smart $]

Not a Code issue, as stated.

 

[Frank A]

Not a code issue. Code does not require any allowance at all for future possible loads.

Thanks for your answer.

 

[Frank A]

Not a Code issue, as stated.

Thanks for answering.

 

[gadfly56]

Not a Code issue, as stated.

That said, do pay attention to the job specifications, if any. They may have requirements beyond any minimums required by code.