So I’m trying to add a new circuit breaker for a plug because there are multiple outlets on this circuit and when everything is being used the breaker trips

The outlet is a 125/250v 4 wire 3 pole 3 phase grounded outlet that powers up a meat cutting saw.

My question is that do I need 3 breakers to power up this plug or would I be fine with just 2 breakers. Because from what I understand I can get 210 volts phase to phase so I don’t see why I’d need all 4 wires. I think that I’d only need 2 hots and a ground and I should be fine. That would mean that I’d only occupy 3 out of the 4 screws on the plug.

Thank you

  • Are you rewiring this onto a dedicated circuit, or...? Sep 26 '18 at 1:32
  • Shoot us a photo of the nameplate on the motor. Sep 26 '18 at 8:25
  • What flavor of 3-phase? That term alone is not defining..
    – Tyson
    Sep 26 '18 at 10:44

It's generally a big problem when a three phase motor loses a phase, the remaining phases will be overloaded trying to make up the slack. There are even monitors / relays to prevent running a motor with a phase lost. So you definitely wouldn't want to try to run the motor with a missing phase.

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