Nuetral needed in a disconnect

[Greg38]

I am working in a huge bldg. that has Three Phase 208v bus duct running through out the bldg. The bus duct DOES NOT have a neutral in it. I am planning to feed a three phase 208v transformer through a disconnect in order to create a neutral for a 120/208v three phase panel so that I can feed receptacles and lights in an area of the bldg. My question pertains to the disconnect that is on the primary side of the transformer. Am I required to have a neutral in the Disconnect?

 

[kbsparky]

Nope. Not if you configure the transformer for delta primary, and wye secondary.

You are creating a SDS, and the (new) neutral will have to be bonded on the secondary side of the transformer either at the source or the first disconnecting means.

 

[augie47]

Nope. If it's not needed, it's not required.
{not to be confused by 404.2(C)}

 

[Greg38]

Thank you very much!!! Can you give me the section of NEC to find this please.

 

[hillbilly1]

I would verify it is a 208 wye feeding the buss duct, I have a sneaky suspicion that it may be a 240 volt delta. Delta's are used quite often in industrial establishments.

 

[Greg38]

I would verify it is a 208 wye feeding the buss duct, I have a sneaky suspicion that it may be a 240 volt delta. Delta's are used quite often in industrial establishments.

Thank you for that suggestion. I have verified it and I am 100 percent certain that it is 208 wye.