Same conduit for return

[Zyb]

I'm running conduit outside for the disconnect. Can I used the same conduit for return? Thanks

 

[infinity]

Sure.

 

[ptonsparky]

Count your current carrying conductors and adjust ampacity as needed.

 

[steve66]

Isn't that not only allowed, but also a requirement? At least if the conduit is ferrous?

 

[infinity]

Isn't that not only allowed, but also a requirement? At least if the conduit is ferrous?

He's asking about line and load in the same raceway.

 

[ptonsparky]

Isn't that not only allowed, but also a requirement? At least if the conduit is ferrous?

Don't separate the phases in different metallic conduits.

 

[steve66]

He's asking about line and load in the same raceway.

That makes sense. I was thinking switch legs.

 

[hillbilly1]

I'm running conduit outside for the disconnect. Can I used the same conduit for return? Thanks
View attachment 2580392

Service disconnect? Or equipment disconnect? Transferswitch feed and return?

 

[herding_cats]

That's fine to do. Is the conduit metallic or not? Watch out for "single wire transformer rule" where conductors can heat up when singled out in metallic conduit. I had an ordeal in Oklahoma where I used 3 separate PVC runs in a UPS backup power system and the inspector threw a fit. He didn't understand that its perfectly fine to do in non-metallic pvc.

 

[jaggedben]

Isn't that not only allowed, but also a requirement? At least if the conduit is ferrous?

If there's only one switched conductor going to the disconnect, then yes. If it's both hots of a single phase 120/240, for example, then they could go in one conduit and return in another.

 

[wwhitney]

If there's only one switched conductor going to the disconnect, then yes. If it's both hots of a single phase 120/240, for example, then they could go in one conduit and return in another.

In the latter case, if those hots supply any L-N loads, the associated grounded conductor would also need to go in one conduit and return in the other.

Cheers, Wayne