I have a 480V 3-phase circuit and a 208V 3-phase circuit that are fed from the same electrical closet and the load is in the same room. Are there any restrictions on combining these circuits in the same raceway? These circuits serve power loads not lighting so there should be separate disconnecting means in separate enclosures for each load. I was sure that this is not a problem with raceways but are there any other NEC restrictions that I am missing?
Using a common raceway for circuits of diffrent systems
- Thread starter mjc1060
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scott minter
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- Kennedy Space Center, Florida
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- Associate Engineer
No it's fine. Use the correct insulation type (600v) and I would color the phases correctly, certainly not code but helpful.
And if it passes through any boxes label the boxes 2 different voltages fed from different locations.
And if it passes through any boxes label the boxes 2 different voltages fed from different locations.
Be sure you comply with 210.5(C)
(C) Ungrounded Conductors. Where the premises wiring system has branch circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch circuit shall be identified by phase or line and system at all termination, connection, and splice points. The means of identification shall be permitted to be by separate color coding, marking tape, tagging, or other approved means. The method utilized for conductors originating within each branch-circuit panelboard or similar branch-circuit distribution equipment shall be documented in a manner that is readily available or shall be permanently posted at each branch-circuit panelboard or similar branch-circuit distribution equipment.
(C) Ungrounded Conductors. Where the premises wiring system has branch circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch circuit shall be identified by phase or line and system at all termination, connection, and splice points. The means of identification shall be permitted to be by separate color coding, marking tape, tagging, or other approved means. The method utilized for conductors originating within each branch-circuit panelboard or similar branch-circuit distribution equipment shall be documented in a manner that is readily available or shall be permanently posted at each branch-circuit panelboard or similar branch-circuit distribution equipment.
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