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I have a large woodworking machine with a 5HP, 240VAC motor, requiring a 30A 240VAC branch circuit. The machine weighs about 1000 lbs and is stationary (not mounted on a mobile base). The machine will have a dedicated branch circuit regardless of the connection method.

Is this machine required to be attached with a plug-and-cord method, or hardwired in with flexible conduit?

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  • Does it have a plug or does it have a junction or wiring box? If you have the manual, does it prescribe a wiring method? – Hari Ganti Feb 1 '18 at 19:17
  • If you do hard-wire it in, put in a lockable disconnect. This is so power can be shut off and locked off when servicing. – C Knight Feb 1 '18 at 20:43
  • You may want to consider a motor start relay. if power is interrupted while running it won't restart on its' own when power is restored. – mikes Feb 1 '18 at 22:32
  • It's got a lock-able disconnect switch on the machine and a latching E-Stop button on the front. The motor is a 3-phase driven by a VFD hooked to single-phase, which already does the duty of a start relay. – cathode Feb 1 '18 at 22:37
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For stationary equipment you can go hard wire or plug connected. Usually wood working equipment has a high vibration so a 6' length of flexible conduit is used. In my shop I prefer cord connected on most equipment but my big air compressor that is bolted to the floor is flex connected.

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    Note that if it gets hard wired, there should be a local disconnect near the machine – poorplanning Feb 2 '18 at 3:02

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