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  1. #1
    Join Date
    Oct 2006
    Posts
    5

    Default Power for welder

    Just bought a Miller econotig that runs off 240volts. I am having trouble finding away to power it up. Searched the forums but cant find any info. I had a Miller 135 that ran off a house hold 120v outlet. I read i can use a dryer recepticle but where can i find a extention cable to power it. Lowes and Home Depot only have 6', i need about 12'. Any help would be great

  2. #2
    Join Date
    Aug 2006
    Location
    Oklahoma City, Oklahoma
    Posts
    304

    Default

    I don't want to sound rude, but for your own safety I'm going to make a very direct comment. If you don't already know how to tackle a basic wire problem such as building up an extension cord from a dryer plug down to a 20A plug (I'm guessing 20A, I don't have that machines specs), then I HIGHLY suggest you have an electrician come out and install a dedicated outlet for your equipment. I say this because electricity is a wonderful thing, but it can KILL you in 1/60 of a second and not even say excuse me. At best it can burn your house down, or fry your new gear. I think I can speak for a lot of folks on here that we want you around long enough to show off some of your TIG projects!! I say this because a friend of mine did $75,000 worth of fire damage to their house because of similar rigging on his electric hot water tank that was in the garage. A couple hundred bucks for an electrician is very cheap insurance if you arn't 100% sure of what you are doing. Just my two cent. SSS
    Last edited by SkidSteerSteve; 10-18-2006 at 01:30 PM.

  3. #3
    Join Date
    Sep 2002
    Location
    Clark County, NV
    Posts
    2,696

    Default

    What SSS said is sound advice. But if you don't mind using the dryer receptacle, it's a simple matter to build your own adapting extension cord, all with parts from HD. Buy 12/3 SJOOW cord by the foot, however long you need it from the dryer receptacle to the locations you'll need to use the welder. You may use 10/3 cord if you wish to have the full ampacity of the circuit. Your welder will work fine on 12/3, however.

    For the plug, use a NEMA 10-30P (3-hole) or NEMA 14-30P (4-hole) on one end of the cord, depending on your dryer. If you have 4-hole, you will not need to attach anything to the middle flat, just the outside flats (hots) and the round ground.

    For the other end, use a NEMA 6-50R.

    Take extra care when installing these ends, following the instructions carefully. If you don't get a good, tight clamp against the copper, strip twice as much and double it over under the terminal. Most importantly, only strip the jacket as far as you need to. Make sure the jacket clamp gets a good grip on the jacket, NOT on the insulated conductors within. Do not nick the insulation of the conductors when stripping back the jacket. Use a sharp razor knife and cut mostly through it, but not all the way, then bend it sharply and press the knife against the cut until it only cuts the jacket through without nicking the insulated conductors.

  4. #4
    Join Date
    Oct 2006
    Posts
    5

    Default

    Thanks MAC702. That seems pretty simple. I live an an apartment so i cant just have an electrian come over and modify some recepticles for me.

  5. #5
    Join Date
    Sep 2002
    Location
    Clark County, NV
    Posts
    2,696

    Default

    Since you'll be using a 3-wire cord, recolor the white wire at both ends to something other than white, grey, or green, because you will be using it as a hot, and not as a neutral.

  6. #6
    Join Date
    Oct 2006
    Posts
    642

    Default

    Yeah as others said .... get some SO cable.

    I'd use 10/3, I know that the NEMA codes allow a " fudge factor" for Welders with thier duty cycles but I am old school.

    If a device says it uses 20 Amps, than I use a cable that can carry 20 Amps all day long. Otherwise you have created an extension cord useful on only that device. Who knows you may purchase another 220 V device in the future and could use that same cord.

    It just make sense safety wise.

    I had to install a breaker and wiring for my MM210. It only eats 28 amps. Well we installed wire capable of 50 Amps and a 40 amp " normal " breaker as per Miller advice.

    A little overkill? Perhaps.... however I am eyeing some devices that at full load can hit 50 amps.


    in any case, get an outlet to match the welder, a plug to match the drier outlet and some 3 conductor SO cable.

    Recolor the WHITE wire as it wont be used for Neutral.

    In any case we made the WHITE wire RED That way " Red and Black " went to the hot terminals and GREEN went to ground.
    Last edited by harcosparky; 10-19-2006 at 05:08 AM.

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