Running a neutral to a disconnect

[coltonmkelsey]

If i have A 240v circuit run into a tesla power wall 3, nuetral landed in the pw3, and then run just line 1 and line 1 plus ground to a disconnect and back. Line and load in the same raceway. Does my nuetral have to enter the disconnect just to make a loop and come right back out?

 

[jaggedben]

No.

(But man I have been frustrated trying to explain this one to a handful of inspectors.)

 

[Strathead]

No.

(But man I have been frustrated trying to explain this one to a handful of inspectors.)

Isn't that irritating? One would assume that inspector also doesn't know that article 404 is applicable to disconnects. A switch is a switch

 

[coltonmkelsey]

Isn't that irritating? One would assume that inspector also doesn't know that article 404 is applicable to disconnects. A switch is a switch

Thanks for the replies it's very irritating that they don't understand that especially in that circumstance, the inspector had even called the building official in the building official started going off with his 20 years experience and blah blah blah and then started yelling at me lol

 

[scott746]

If i have A 240v circuit run into a tesla power wall 3, nuetral landed in the pw3, and then run just line 1 and line 1 plus ground to a disconnect and back. Line and load in the same raceway. Does my nuetral have to enter the disconnect just to make a loop and come right back out?

I wouldn’t loop a neutral through a disconnect just for decoration, that starts sounding like “because the pipe was there” wiring lol. For stuff like this the real answer is whatever the Powerwall docs and local code actually require for that exact disconnect setup, especially conductor grouping and disconnecting means. If the neutral is not being switched or terminated there, forcing it through the box just to take a lap makes no sense to me. I’d verify the listed wiring diagram and ask AHJ before doing anything weird, because this is one of those details inspectors love to roast.

 

[infinity]

What section of Article 404 overrides 300.3(B) for the raceway feeding a disconnect switch?

 

[ggunn]

I wouldn’t loop a neutral through a disconnect just for decoration, that starts sounding like “because the pipe was there” wiring lol. For stuff like this the real answer is whatever the Powerwall docs and local code actually require for that exact disconnect setup, especially conductor grouping and disconnecting means. If the neutral is not being switched or terminated there, forcing it through the box just to take a lap makes no sense to me. I’d verify the listed wiring diagram and ask AHJ before doing anything weird, because this is one of those details inspectors love to roast.

I agree that running a neutral to a disconnect when the neutral has no connection in the disco is pointless, but if the disco controls a supply side PV interconnection, then the neutral needs to be run and bonded to a GEC in the disco.

 

[wwhitney]

What section of Article 404 overrides 300.3(B) for the raceway feeding a disconnect switch?

I think the reference to Article 404 isn't so much that it has a specific allowance, but that a disconnect switch is comparable to a normal light switch, which is obviously Article 404.

300.3(B) doesn't need overriding, because it refers to the grounded conductor "where used". If the grounded conductor isn't used in the disconnect switch, then it doesn't need to be run with the ungrounded conductors to and from it.

So the issue is just establishing that this disconnect switch is not subject to a requirement similar to 230.75 (which says that for a service disconnect, means must be provided to disconnect the grounded conductor, even if just manually separate from the normal disconnect function).

Cheers, Wayne

 

[jaggedben]

What section of Article 404 overrides 300.3(B) for the raceway feeding a disconnect switch?

Aside from 404.2(C), a switch leg for an ungrounded conductor(s) has never required a grounded conductor to be run with it.

 

[infinity]

Aside from 404.2(C), a switch leg for an ungrounded conductor(s) has never required a grounded conductor to be run with it.

Isn't that for a switch loop for 3-way and 4-way switches. I don't see how that applies to a disconnect switch.

 

[jim dungar]

Isn't that for a switch loop for 3-way and 4-way switches. I don't see how that applies to a disconnect switch.

Especially one that is run in pipe, where a future conductor can be pulled.