Extension cord length
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  1. #1
    Join Date
    Oct 2011
    Posts
    76

    Extension cord length

    How long of a cord can I make for 30 amps 240v before voltage drop becomes an issue? The 10 awg cord I have is 100 ft. long. Which is better, a longer extension cord or longer leads on the welder?

  2. #2
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    10,901

    Re: Extension cord length

    Your 10ga is pushing it for my liking at 240V/30A. I don't like more than a 3% drop at full load and that's where 30A at 100' falls with 10ga.
    http://www.gorhamschaffler.com/volta...alculator.html

    The recommendation would be 8ga for 100' at 30A.
    http://www.gorhamschaffler.com/wire_...alculator.html
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  3. #3
    Join Date
    May 2010
    Location
    Democratic People's Republic of North Koreafornia
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    1,787

    Re: Extension cord length

    Quote Originally Posted by duaneb55 View Post
    Your 10ga is pushing it for my liking at 240V/30A. I don't like more than a 3% drop at full load and that's where 30A at 100' falls with 10ga.
    http://www.gorhamschaffler.com/volta...alculator.html

    The recommendation would be 8ga for 100' at 30A.
    http://www.gorhamschaffler.com/wire_...alculator.html
    You're above link doesn't work. Could you please repost the correct URL? Thank you.
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  4. #4
    Join Date
    May 2008
    Location
    Orange, TX
    Posts
    10,901

    Re: Extension cord length

    They work for me.
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    SA-200 Blackface Code# 8638
    Star Jet 21-110

    Two term limit - one in office, one in jail.

  5. #5
    Join Date
    May 2010
    Location
    Democratic People's Republic of North Koreafornia
    Posts
    1,787

    Re: Extension cord length

    Quote Originally Posted by duaneb55 View Post
    They work for me.
    Ah, works now. I did something wrong earlier I guess. Hey that is a neat calculator! Thank you for posting that!!!!!
    Lincoln Power Mig 216
    Lincoln AC/DC-225/125

    Miller 625 X-Treme Plasma
    Miller 211

    Forney 95FI-A 301
    Victor Journeyman O/P
    Milwaukee
    Dayton
    Makita
    Baileigh

  6. #6
    Join Date
    Aug 2011
    Location
    Cape Cod, MA
    Posts
    920

    Re: Extension cord length

    Always better to use longer extension cord than longer welding leads, by a factor of about 3 to 1.

    MIG performance is more sensitive to voltage drop than stick or TIG.

    John
    A few welders
    A lot of hammers
    A whole lot of C-clamps

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