range circuit conductors

[rgpickrell]

Is there any exception to the small conductor rule
that would allow an existing no.10 NM for a residential cooktop to be used for a 40A range circuit? The homeowner is doing away with the cooktop and oven and wants to use the range only.

 

[ryan_618]

Re: range circuit conductors

See if you meet the exception to 210.19.

 

[bphgravity]

Re: range circuit conductors

The branch circuit conductors must be sized for the load to be served. So you will need #8 from the branch circuit panelboard. The exception would only apply if you tap the branch circuit and serve the appliance by a smaller conductor.

Also, the branch circuit will be required to have 4 conductors. Many cooktops don't require the grounded conductor, the range does.

 

[midget]

Re: range circuit conductors

The 4 conductors would be 2 hots, a neutral, and a ground...right? And since the ground isn't counted in NM, it would only be 3 conductors w/ ground, right? Like some 8/3? Or am I thinking of this wrong?

 

[bphgravity]

Re: range circuit conductors

Yes, you are correct. Better terms would be two ungrounded, one grounded, and one grounding (bonding).