Branch Circuit Calc.

[Kissi Asiedu]

Having a blue print with all dimensions of a residential building, is there
a way or formula to calculate how many cables you would need for such
building? Or is it a matter of guess? Example how many 14/2 cable you would
need for your lighting circuits etc.

 

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Having a blue print with all dimensions of a residential building, is there
a way or formula to calculate how many cables you would need for such
building? Or is it a matter of guess? Example how many 14/2 cable you would
need for your lighting circuits etc.

You start with the load based on 3va per square foot and then divide
that equally across your general lighting circuits. Other provisions
in the code like the bedroom AFCI will probably add a circuit or two
to the general lighting circuits. You also have the required 20a
kitchen (2), bathroom and laundry circuits. I wouldn't skimp on the
general lighting circuits. A few bucks extra pre-drywall will avoid
many hundreds of dollars later if you need more.