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Conduit is just a medium to get the wires from one place to another. There is no voltage restrictions in low voltage wiring (750 volts or less). When it comes to conduit fill, electricians are governed by the electrical code conduit fill tables. The conduit is sized to accommodate the conductor size for a specific load.

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Q: What type of conduit is used for 480 volt 3-wire?
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Can 480 volt electric be run in emt conduit?

Yes 480 volt electric wiring can be run in emt conduit.


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Yes, 120 and 240 volts can be run in the same conduit.


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NO! The National Electric Code requires a partitioned box when high and low voltages share the same box. Always avoid installing different voltages in the same box, it's a bad idea. <<>> A 277 volt switch has a different screw to box configuration that a 120 volt switch. This is also true for 347 volt switches. The switch is configured this way so that 120 volt switches can not be used on the wrong voltage inadvertently According to the 2008 NEC 300.3 C 1 says yes as long as all the conductors in the wiring enclosure have at least an equal insulation rating as that of the maximum circuit voltage applied.


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