test question neutral reduction range

[Twoskinsoneman]

A branch ciruit supplies a household electric range with a demand factor of 8000 watts. The ungrounded conductors have an ampacity of 40 amps. The neutral ampacity must be at least:
40. 28. 35. 24

My confusion is 220.61 says the 70 percent is based on the load but the correct answer is based on the ungrounded conductor ampacity... What do you think?

 

[ray cyr]

I don't think 220.61 applies to branch circuits.... or I think I am reading your question incorrectly

 

[Twoskinsoneman]

Your right ray. I was in the wrong section. Since the demand of the range is 8000 the actual rating of the range has to be over 8.75kw.
I should have been in 210.19(A)(3) ex 2.

Reading through that secion makes it a little clearer stating the neutral conductor should be based on 70% of the OCPD. The question just gives the ampacity of the ungrounded conductors but I guess it should be used not the load.

The correct answer given is 28.