3-phase Neutral?

[Mr. Pickle]

Have a scenario where we have 3-phase feeding a different building on a campus. The only loads in this building are 3-phase. Can anyone point me to where in the NEC it states that a neutral wire does or does not need to be ran to this outbuilding?

 

[Little Bill]

Have a scenario where we have 3-phase feeding a different building on a campus. The only loads in this building are 3-phase. Can anyone point me to where in the NEC it states that a neutral wire does or does not need to be ran to this outbuilding?

Will this be a feeder or separate service to the building?

 

[ggunn]

Will this be a feeder or separate service to the building?

What difference would that make?

 

[wwhitney]

What difference would that make?

Grounded conductor must be brought to a service disconnect so that the MBJ can be installed there. With a feeder, there is no such requirement.

Cheers, Wayne

 

[Little Bill]

Grounded conductor must be brought to a service disconnect so that the MBJ can be installed there. With a feeder, there is no such requirement.

That's why I asked the question.

 

[Little Bill]

Have a scenario where we have 3-phase feeding a different building on a campus. The only loads in this building are 3-phase. Can anyone point me to where in the NEC it states that a neutral wire does or does not need to be ran to this outbuilding?

See post #4

However, I would question why you wouldn't want the neutral/grounded conductor present at the building. You probably would want lights, or general purpose receptacles. Even if you don't want/need them now, there's always future needs. One more conductor can't be that much more.

 

[ptonsparky]

See post #4

However, I would question why you wouldn't want the neutral/grounded conductor present at the building. You probably would want lights, or general purpose receptacles. Even if you don't want/need them now, there's always future needs. One more conductor can't be that much more.

I cursed more than one EC, EE, Owner that thought it was cheaper to leave it out.

 

[tortuga]

I have seen it done with 240V pump stations when feeders were up-sized neutral was omitted so existing duct could be used the alternative was a huge trenching project ... it adds some complexity but if saves cost..
Its easier than ever to get 100-240V LED lighting than can be run L-L, but you have to switch both poles which adds some complexity if your using a photo eye etc. The required 120v GFCI by the panel can be on a small transformer.

 

[Knightryder12]

I cursed more than one EC, EE, Owner that thought it was cheaper to leave it out.

Usually its not the EE's choice. We take input from the owners. Typical owner is mainly concerned with first cost.