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Need Minimum Clearance - 208V Bolts?

Need Minimum Clearance - 208V Bolts?

Need Minimum Clearance - 208V Bolts?

(OP)
Does anyone know the the minimum clearance of open air 208v conductors?  I have an STS with B & C phase bolts that are too close together and I need to know how much space between I need.  Picture attached.

Couldn't find it in NEC 2008.

Thanks.

RE: Need Minimum Clearance - 208V Bolts?

I don't think that is addressed in the NEC.  The closest I know of is 366.100(E) in the 2008 code, but that section does not directly apply to your question.

RE: Need Minimum Clearance - 208V Bolts?

It will be a manufacturing requirement or a testing lab's such as UL or ETL. Look up NEMA too.


By the way there is no picture attachment.

Rafiq Bulsara
http://www.srengineersct.com

RE: Need Minimum Clearance - 208V Bolts?

One inch in air, two inches on an insulating surface.

Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.

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