Switch legs and 300.3(b)

[Pinnie]

Does 300.3(b) make it so you need neutrals with the associated hots in every raceway? I have a switch bank with conduit ran to it, which exempts you from needing a grounded conductor at your switch bank (404.2(c)(1))

 

[ActionDave]

No. Somewhere in 300.3(b) it says "and where needed, the grounded conductor".

 

[Pinnie]

No. Somewhere in 300.3(b) it says "and where needed, the grounded conductor".

Gotcha. I thought there was a chance that alluded to three phase loads.

Can someone also explain the nuances of the egc and ungrounded conductors canceling out magnetic induction or self impedance during a fault?

 

[ptonsparky]

Do an amp clamp of a hot and neutral. The net current is zero. A fault to the EG will react the same, if there is only one path. Usually not the case.