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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
    CST-250
    HF-15 High frequency
    XR15 w/Push-Pull Gun
    Victor O/A, DeWalt, North mask


    "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
    2,860

    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 12:51 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.

  7. #7
    Join Date
    Jan 2008
    Location
    El Paso TX
    Posts
    6

    Default

    Quote Originally Posted by Woodshed View Post
    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.
    Yeah, that's what I did. I needed an extension to go from the dryer plug out to my garage. I bought both the 3-terminal welder side receptacle, and the 4-terminal male plug from Lowe's. Both made by Cooper. (using a 25' 8/3 cable) Following triggerman's advice, I connected the green to the lower center "L" shaped terminal, (ground) and the black and white to the side spade terminals (hot). I left out the round neutral terminal. Got it all wired up and fired the 175 and it's working perfectly. It's been about a year and a half since I've done any welding so gonna get some practice in...

    Thanks again.

  8. #8
    Join Date
    Mar 2007
    Location
    ****inson ND
    Posts
    557

    Talking

    What exactly is the purpose of the nuetral anyways?

  9. #9
    Join Date
    Dec 2005
    Location
    Dallas, TX area
    Posts
    267

    Default Neutral

    The voltage from hot to hot is 240V. From either hot to neutral is 120V. The green ground wire should NEVER, NEVER, NEVER EVER be wired to carry current during normal conditions. The neutral is a return path for the current coming down the hot leg to get back to the wall, breaker box and, ultimately, the power plant.

    Hope this helps.
    Triggerman

    Ammonia refrigeration tech
    Trailblazer 302 (yes, it's new)
    Millermatic 180 w/Autoset
    CST-250
    HF-15 High frequency
    XR15 w/Push-Pull Gun
    Victor O/A, DeWalt, North mask


    "A professional knows what to do. A craftsman knows why."

  10. #10
    Join Date
    Oct 2007
    Location
    Indiana
    Posts
    541

    Default

    The neutral is for appliances that have 120v controls, as most modern appliances do now. You need a neutral and one leg of 240v for 120.
    Tim Beeker,
    T-N-J Industries
    (my side bussiness)

    Miller Synchrowave 350LX with tigrunner
    Esab 450i with wire feeder
    HH135 mig
    Thermal Dynamics cutmaster 51 plasma cutter
    Miller aircrafter 330 - sold
    Marathon 315mm coldsaw
    vertical and horizontal band saws
    table saw
    Dewalt cut off saw
    Sand blast cabinet
    lots of hand grinders
    Harris torch
    beer fridge

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