UL 83 and Voltage Rating of Conductors

[bfro]

Per UL 83, conductors are marked "the maximum voltage for which the wire or cable is rated". That being said, does "maximum" mean maximum or nominal maximum?

I am working on a older, unique 600V system and there has been some concern with utility voltage fluctuations producing a voltage slightly greater than 600V at times. Can I use 600V rated conductors?

I have confirmed with the equipment manufacturer that the equipment ratings are nominal.

Any thoughts?

Thanks!

 

[Dennis Alwon]

That is a good question and personally I doubt the difference would matter however if the max voltage is 600v and you go over then IMO it is not compliant. I would be interested to know what the manufacturer's say. My bet is 600v is 600V