Wiring 2 air compressors?

Old 11-10-20, 01:56 PM
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Wiring 2 air compressors?

Hello! I have 2, 5 HP air compressors in my shop. I have them plumbed in (air lines), so I can switch from one to the other, for maintenance, or in case one breaks down. To switch power, I open up the shut off box, and swap out the 2 hot wires that go to the compressors. Is there a 3 way switch I can wire in, so choose which compressor gets power, so I don't have to keep connecting/disconnecting the wiring on the disconnect box?
Old 11-10-20, 02:31 PM
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A manual transfer switch like used for switching the power between generator and house would work.
Or a receptacle and plug on each compressor.
Old 11-10-20, 04:43 PM
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Cords with plugs would be the least costliest.

They do make switches like you are looking for but they aren't necessarily inexpensive.
You need to make sure any switch you use can carry the needed amperage.
30A transfer switch
20A double toggle
Old 11-10-20, 05:05 PM
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If the compressors have true 5HP motors you need to use switches or plugs that are 5HP or higher rated to be NEC compliant.

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