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  1. #1
    Join Date
    Jan 2008
    Location
    El Paso TX
    Posts
    6

    Default 4 Post Dryer Plug Wiring

    I've got a Millermatic 175 mig welder which I'm trying to wire to my 4 post Dryer outlet. I'm using a 25' 10/3 extension cable. The dryer outlet consists of 4 posts..........two flat spade terminals side by side, a round terminal on top, and an "L" shaped terminal on the bottom (I believe it's a 30 amp). My 175 plug has a small spade teminal on the left, a larger spade terminal on the right, and a round terminal at the top. The 10/3 cable has a green, white, and black. I was hoping someone here on the forum could help as far as the wiring goes.

    Thanks in advance.

  2. #2
    Join Date
    Jan 2008
    Location
    El Paso TX
    Posts
    6

    Default

    Correction to the post above, the cable is 8/3, not 10/3.

  3. #3
    Join Date
    Dec 2005
    Location
    Dallas, TX area
    Posts
    267

    Default New receptacle.....

    The receptacle that fits your MM175 is a NEMA 6-50 (nicknamed Welder outlet) which can be had at Lowe's/Home Depot or the like. It slightly resembles a regular 120V outlet. The hot wires attach to the outside lugs and the gound wire to the round lug. The 4-wire dryer receptacle (probably) has a black and a red (hot wires), a white (neutral) and a green (ground). The white neutral does not get connected to the new 6-50 receptacle. Leave it capped off inside the box.

    Hope this helps.
    Triggerman

    Ammonia refrigeration tech
    Trailblazer 302 (yes, it's new)
    Millermatic 180 w/Autoset
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    HF-15 High frequency
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    "A professional knows what to do. A craftsman knows why."

  4. #4
    Join Date
    Jan 2008
    Location
    El Paso TX
    Posts
    6

    Default

    Yes, I already have both receptacles which I got from Lowe's. So black and white to both hots, and green to ground, neutral not used.

    That'll do it!!

    Thanks!

  5. #5
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,889

    Default

    Quote Originally Posted by JCTX View Post
    Yes, I already have both receptacles which I got from Lowe's. So black and white to both hots, and green to ground, neutral not used.

    That'll do it!!

    Thanks!

    NO!

    Black, RED and Ground Do not connect the white-

    ahh I see you are making an extension cord- So yes
    Last edited by Broccoli1; 01-09-2008 at 01:51 PM.

  6. #6
    Join Date
    Feb 2007
    Posts
    9

    Default

    I was allways told that you never change out the wall plug only change pigtails to match the wall plug. The 4 prong has 2 hot 1 ground 1 netural which is the new code. The three plug has 2 hot and 1 ground-netural. Three prong netural and ground sre the same.

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