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Thread: Miller cst 250 wiring

  1. #1
    Join Date
    Jul 2021
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    Miller cst 250 wiring

    Just bought a used miller CST 250. It came with four prong cord but had 3 prong plug. The wires used were white, black, and green. Im confused as to the correct wiring inside the welder. It seems as though the previous owner used the white neutral in place of the red hot. What do i do here

  2. #2
    Join Date
    May 2007
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    Re: Miller cst 250 wiring

    theres no common here. black and white are for hot in single phase, leave the red out. add the red as a hot for thee phase only. green is ground

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  4. #3
    Join Date
    Dec 2007
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    Re: Miller cst 250 wiring

    as 123weld said.

    Section 3-12 in the manual

    https://www.millerwelds.com/files/ow...O2237H_MIL.pdf
    Ed Conley
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