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  1. #1
    Join Date
    May 2014
    Posts
    6

    Default What size conductor for MM211?

    I have a new MM211. What conductor AWG do I need to run 30ft. from 100 AMP service box, then flexible cord for another 70 feet? The manual says 230V, 14 AWG, is good for 53 feet but this is minimum, AWG minimum goes up for longer length. Thanks

  2. #2
    Join Date
    Dec 2013
    Location
    At the epicenter of the Green Mountain Range in VT
    Posts
    293

    Default

    What are primary amperage, input voltage and duty cycle at full output? How much potential for voltage loss supplying your 100 amp panel? What is the utility supply voltage?

  3. #3
    Join Date
    May 2014
    Posts
    6

    Default

    Page 18 of my manual: input voltage 230
    input amperes @ rated output 24.3

    Page 12 of my manual: 230 VAC Input 30% duty cycle @ 150 amps

    I have 150 ft. of # 2 AWG 3 conductor Aluminum running from house to shop

  4. #4
    Join Date
    Mar 2011
    Location
    La
    Posts
    248

    Default

    This flexible cord is all you'll ever need.

    http://m.cyberweld.com/230voexco25.html

    But more than likely overkill. Great product though.


    Dynasty 200 DX
    Diversion 180 (FOR SALE)
    Millermatic 350P, XR-Aluma-Pro
    30A Spoolgun
    Lincoln Pro Mig 140
    Hypertherm Powermax 30
    14" Rage Evolution 360
    40 ton press brake
    Shop full of tools

  5. #5
    Join Date
    May 2014
    Posts
    6

    Default

    Thanks for the link, gonna get the 50', Now I need to run at least 30 feet from my shop circuit box to where I want the outlet to be on the wall, do you know what size wire I need to do this with?

  6. #6
    Join Date
    Jan 2014
    Location
    Northern West Virginia
    Posts
    37

    Default What we used

    I wired my son's garage for my 211, which he will soon inherit, and did it like this. I started at the 200 amp service by installing a 40 amp double breaker. From it I ran 35 feet of 8 AWG to the wall outlet. I also bought a 25 foot 8 AWG extension cord so that along with the 211's power cord we can reach anywhere in the garage. I know what the Manuel says but there is no way on the face of this good green earth I'd run 14 AWG wire for anything with a power draw greater than 15 amps.

  7. #7
    Join Date
    Mar 2011
    Location
    La
    Posts
    248

    Default

    8 should be fine, 6 would be better especially if you upgrade to a larger machine later.


    Dynasty 200 DX
    Diversion 180 (FOR SALE)
    Millermatic 350P, XR-Aluma-Pro
    30A Spoolgun
    Lincoln Pro Mig 140
    Hypertherm Powermax 30
    14" Rage Evolution 360
    40 ton press brake
    Shop full of tools

  8. #8
    Join Date
    Dec 2013
    Location
    At the epicenter of the Green Mountain Range in VT
    Posts
    293

    Default

    There are two things to consider; voltage loss being low enough that the welder performs well, and heat in the cable not being excessive.
    Your limited duty cycle will place you in a category where adequate voltage is your concern. Guessing you are being provided with 240 at the street, you can afford a loss of 10 volts. You haven't said how much or what size cable, or how much household load you can expect. You'll loose some voltage on the way to the house. Lets guess 2% or 4.8. You've got 5.2 volts to spare. Garage load other than welder must be known. Each leg of the power journey must be calculated.
    The formula is:
    KxIxLx2
    Ed
    K is resistance in ohms per mil foot, A piece of wire .001" diameter 1' long. Copper:12.9 Aluminum: 21.2
    I is amperage, Peak amperage is what you are concerned with, I.E. household, garage.
    L is length in feet.
    2 is because electricity must make a round trip.
    Divide the product by acceptable voltage loss

    Compare your result in units of cross sectional area in circular mills, with Table 8 Chapter 9 of NAEC #10--10380, #8--16510, #6--26240, #4--41740, #3--52620, #2--66360

    It is common to find larger sizes cost less.

  9. #9
    Join Date
    May 2014
    Posts
    6

    Default

    There will be no other loads while I am welding. I have whatever the standard is going to the house from the power pole, 240V I guess, aluminum 3 conductor 2AWG running from the house to the shop approx. 150 feet with a 100 AMP breaker.

  10. #10
    Join Date
    May 2014
    Posts
    6

    Default

    Quote Originally Posted by ja baudin View Post
    8 should be fine, 6 would be better especially if you upgrade to a larger machine later.
    Thanks, I think I'll take your recommend and go with 8 AWG. I don't do enough welding to up grade later. I'm just a hobbyist.

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