I'm not inclined to add 4-wire + G cables to the stock in my van, and I don't trust my remembering to bring a length on the day that I need it.
Given a 3-function unit (fan/heat/light), have the branch circuit homerun at the switch and use a 12/3 and a 12/2 seperating the neutrals in the unit j-box (the component loads present on pigtails each with their own neutrals). The j-box is tight, though, but not impossible.
Substitute a 12/3 for the 12/2 in a 4-function unit.
Let's say the 12/2 has the light, hot and neutral. That's one circuit and it satisfies 300-3(b). Same with the 12/3 on the heat/fan. The violation of 300-3(b) comes when I don't seperate the neutrals or choose to use only one.
Al
[This message has been edited by ElectricAL (edited 10-24-2001).]
