Sizing Feeder and Service Neutral

[zcanyonboltz]

When sizing 240V neutral conductors in dwellings we can calculate cooking equipment and dryers' grounded conductor at 70% for neutral feeder demand. Say the service load is calculated at 475A and 275A of that is 240V loads what is the method used to size grounded conductor in this case? I'm getting different methods and wire sizes from people.

Can 220.61 (B) (1) be applied in non dwelling, the first part of that article "says household electric ranges" can this article be applied to commercial?
215.2 (A) (2) says no smaller than table in 250.122, I'm just curious the rules for sizing when applying demand factors. Thanks

 

[zcanyonboltz]

http://ecmweb.com/code-basics/characteristics-neutral-conductor
Well I found my own answer, I'm not sure if 220.61(B) applies to just residential or commercial as well.

 

[jumper]

It would apply to commercial.

 

[zcanyonboltz]

It would apply to commercial.

Thanks I appreciate the response. The more I research this the more articles I see and different scenarios, i.e. balanced, unbalanced, linear, non linear how many wire circuit supplied by how many wire system phase type, pretty interesting.