Different voltages in conduit/different panels

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Robert Whiteaker

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Location
San Francisco, CA
I am installing 120 volts, 208 volts and 480 volts to an A/C system. The two panels are right next to each other. This is an industrial business. I have always understood that the when you use 600 volt wires with different voltages that you can put them in the same raceway or gutter as long as the high voltage is not in a low voltage box with low voltage device. Am I wrong? Thanks.:D
 
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texie

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Location
Fort Collins, Colorado
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Electrician, Contractor, Inspector
Robert Whiteaker said:
I am installing 120 volts, 208 volts and 480 volts to an A/C system. The two panels are right next to each other. This is an industrial business. I have always understood that the when you use 600 volt wires with different voltages that you can put them in the same raceway or gutter as long as the high voltage is not in a low voltage box with low voltage device. Am I wrong? Thanks.:D
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Yep, as long as you have the proper colors for the different systems. And be aware that grounded conductors, if any, would have to be different colors, such as white for the 208Y/120 volt and gray for the 480Y/277 volt system.
 
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Robert Whiteaker

Member
Location
San Francisco, CA
That's the code 300.3 (C)

That's the code 300.3 (C)

Thank you again. It really was quite simply stated and absolutely qualifies the work that we did. We joined the two panels together with conduit to a junction box then took all wires to another junction box where high went up and low went down. All wires are color coded and phased and labeled as well as the boxes and panels of course. Inspector had an idea.... maybe it had to do with a sprinkler box or something. :lol:
 
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