AC/DC in Same Conduit? [RE-wrenches]

[Electrical Energy]

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Conductors of different systems can terminate in the same enclosure so long 
as certain conditions are met.

Below is a section from the 2002 NEC Handbook on CD Rom.

200.6
"D) Grounded Conductors of Different Systems. Where conductors of different 
systems are installed in the same raceway, cable, box, auxiliary gutter, or 
other type of enclosure, one system grounded conductor, if required, shall 
have an outer covering conforming to 200.6(A) or 200.6(B). Each other 
system grounded conductor shall have an outer covering of white with a 
readily distinguishable, different colored stripe other than green running 
along the insulation, or shall have other and different means of 
identification as allowed by 200.6(A) or (B) that will distinguish each 
system grounded conductor.
"The requirements found in 200.6(D) are essentially the same since the 1987 
edition of the NEC. However, these requirements are often misapplied. As 
Exhibit 200.2 shows, if grounded conductors of different systems are 
present in the same enclosure, these grounded conductors must be 
distinguishable, such as by different colors. Careful study of 200.6(D) 
reveals what Exhibit 200.2 shows, that is, where one system uses a white or 
gray insulation for the grounded conductor, the other system must use an 
identification different from the color selected for the first system 
colored insulation. For example, where one system uses white for the 
grounded conductor, the second system must use a different color or marking 
such as gray or white with a stripe."

Also:

300.3
"(C) Conductors of Different Systems.
(1) 600 Volts, Nominal, or Less. Conductors of circuits rated 600 volts, 
nominal, or less, ac circuits, and 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."


Drake

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