hi guys i know the nec allow you to downsize feeder natural wire my question is can i do the same on a electric 50a range since the natural only their for accessory i usually don't do this but i have customer that insist on we doing this since he allready have wire can it be done ? i don't c a problem also but just want to get any opinion it will be thhn #8 for the two hot and thhn #10 for nutural n ground
down sizing a neutral wire?
- Thread starter d1reyad
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jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
210.19(A)(3)
Exception No. 2: The neutral conductor of a 3-wire
branch circuit supplying a household electric range, a
wall-mounted oven, or a counter-mounted cooking unit
shall be permitted to be smaller than the ungrounded conductors
where the maximum demand of a range of 8 3⁄4-kW
or more rating has been calculated according to Column C
of Table 220.55, but such conductor shall have an ampacity
of not less than 70 percent of the branch-circuit rating and
shall not be smaller than 10 AWG.
Exception No. 2: The neutral conductor of a 3-wire
branch circuit supplying a household electric range, a
wall-mounted oven, or a counter-mounted cooking unit
shall be permitted to be smaller than the ungrounded conductors
where the maximum demand of a range of 8 3⁄4-kW
or more rating has been calculated according to Column C
of Table 220.55, but such conductor shall have an ampacity
of not less than 70 percent of the branch-circuit rating and
shall not be smaller than 10 AWG.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Yes 10 wire is good for the neutral..
kwired
Electron manager
- Location
- NE Nebraska
sorry, but did you read the article? It was quoted in the reply and you did not even have to go find it.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
I am assuming a raceway as OP has #8 at 50A and cables in this size usually have full sized neutrals.
kwired
Electron manager
- Location
- NE Nebraska
Have you ever seen NM cable with reduced size white conductor? I haven't. Reduced size equipment grounding conductors for larger cables I have seen but never a reduced white conductor.
hmy: I got confused with the smaller equipment ground.... I've never seen a reduced neutral either in a branch circuit cable, but have in the appliance cords.- Status