ECN Forum Forums General Topics of the Trade General Discussion Area Mixing voltages, marking requirements

Not sure of the wording of 2005, but 200.6d of previous codes has covered this situation. Not only applies to different voltages, but specificaly different systems, reguardless of voltage. (Say 3 different tranformers of the same voltage feeding panels with the branch circuits in a gutter, box, or in conduit together.)

300.3(C)(1)
Conductors of circuits rated 600v, nominal, or less, ac circuits, or dc circuits, shall be permitted to occupy the same equipment wiring enclosure, cable, or raceway. All conductors shall have an insulation rating equal to at least the maximum circuit voltage applied to any conductor within the enclosure, cable, or raceway.
As outlined in 725.55(A), this is not permitted with circuits considered class 2 or class 3 circuits.
BUT...I've been on several projects where the project specs did not allow the mixing of different voltages, or different systems, in the same raceways.

[This message has been edited by XtheEdgeX (edited 01-22-2006).]

Just read the 2005 code mentioned by Don, and it seems it is very simularly worded to the 200.6 code section that is specific to grounded conductors, but adds system identification for phase conductors as well. (I guess just short of going as far to have color codes involved in the NEC.)
https://www.electrical-contractor.net/ubb/Forum19/HTML/000061.html