general branch circuits in dwelling unit

[igoratmikeholt]

what is the minimum number of general branch circuits in dwelling unit? nec section 210.11(A) calls for "the minimum number of branch circuits shall be determined from the total computed load and the size or rating of the circuits used." 445sq.ft.x3w/sq.ft.=1,335W/120V=11.1A i.e one 15A or one 20A. When the area is small, as in 'studio' it comes out to be only one circuit. This will, of course, satisfy power requirent. What if there is a circuit failure(loss of continuity, etc.) or a short in the circuit? The dwelling unit will be blacked out. Is there a need for two circuits in dwelling unit? thank you. igor.

 

[charlie b]

Re: general branch circuits in dwelling unit

What you are addressing is the minimum requirements to satisfy code, as compared to the minimum enhancements to satisfy the customer. All the NEC cares about is safety, and all you need to satisfy code is to install the minimum. Yes, one circuit would satisfy code. But I would install at least one other, for the reasons that you mention. But that would be an enhancement (i.e., beyond code requirements), and you could price it out as an option.

It sounds like you are already aware of this, but for the record, the ?general branch circuit(s)? of which you speak are in addition to the two small appliance circuits, the laundry circuit, and the bathroom circuit.

Also, the bedroom?s lights and receptacles are counted in the ?3 watts per square foot.? But they require AFCI protection. If you use only one general branch circuit, then it must have AFCI protection. And if that one circuit also supplies lights and receptacles in the rest of the unit, I do no know if the owner will have problems with false tripping. So it might be wise to run a separate AFCI circuit for the bedroom as well.

 

[highkvoltage]

Re: general branch circuits in dwelling unit

Hey why not save some money and run an extension cord from the neighbors.