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  • 10-2 or 8-2 cable?

    I'm trying to wire in a 220v welder (millermatic 175) receptacle in my garage from an external breaker box located on the outside of my house. The distance between the house and garage is approximately 25ft. There will then be an additional 20 ft from the LB to the receptacle itself (45ft total). I have a bunch of 10-2 uf underground cable which was given to me and was hoping to use, but will that be sufficient? Until now, I've been using a 25ft 8-2 extension cable from a dryer outlet. Also, I'm planning on using the same receptacle for a 220v Air compressor when the welder is not in use.

    Will I have to upgrade to an 8-2 cable or something even larger?

    And one more thing,..........30a, 40a, or 50a breaker??

    Thanks in advance.

  • #2
    #6 wire and a 50A breaker and sub-panel... you won't regret it.
    Bobcat 225NT
    Cutmaster 52
    Lincoln Weld-Pak 100 buzz box
    Caterpillar TH63
    '07 Kawasaki ZZR600

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    • #3
      nfinch86- Canadian Weldor :

      JCTX, Hi; I Ran #6 wire to the shop sub panel, witch is 20ft. from my house. Then I ran #8 wire to the Welder receptical ! Works fine so far !! By the way I'm running a Lincoln 180 myself . .......... Norm : PS. Breaker is 40 amp.!!!
      www.normsmobilewelding.blogspot.com

      Comment


      • #4
        For just the welder the 10 will be fine....what is the amp draw of the air comp.?
        George W. Bush was saving your butt whether you liked it or not!
        Fear is temporary, regret is forever
        HH210 with SG

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        • #5
          Hi there,

          for an MM175 OR up to a 5HP compressor 10AWG wire is good to about 100ft. Don't run both at the same time, you might hurt the compressor motor.

          Bigger compressor or welder and you will need to upgrade.

          also a 30amp breaker is the largest with 10AWG.
          The breaker protects the wire more than the equipment. And shouldn't give your equipment any shortage of power.

          My MM175 is wire with 10AWG
          My XMT350 cc/cv is with 6AWG and a 60amp breaker. I use a 8awg/4wire extension cord that gives me another 25FT of moven around.
          My dynasty DX200 is on 10AWG with a 30amp breaker

          good luck

          Harold
          Live Right Have Fun

          XMT350 CV/CC
          22A Feeder
          MM175
          Dynasty 200DX
          TB302
          12vs Extreme
          Hypertherm PowerMax 1000
          20" x 40" CNC Mills (2)
          16" x 60" engine lathe
          65 Ton edwards iron worker
          3/16' x 24" power slip roll
          16' power feed mitering bandsaw
          and other fun toys

          Comment


          • #6
            Thanks for all the replies.

            84zmike, I'm not sure of the amp draw on the compressor, but it uses a 4hp motor.

            I don't know if I'll be using a larger welder anytime soon but you never know. From the looks of it, I may just get some 8-2 just to be on the safe side.

            Thanks again!!

            Comment


            • #7
              nfinch86- Canadian Weldor :

              Ihavnfun, Hi ; Sounds like you have some Electrical smarts!! Soooo, My compressor is 5hp., and I'm running it on a dedicated 12ga. wire, is this OK or Not???..... Norm :
              www.normsmobilewelding.blogspot.com

              Comment


              • #8
                Originally posted by bretsk2500 View Post
                #6 wire and a 50A breaker and sub-panel... you won't regret it.
                Yup!!

                This will allow you to wire up dedicated 240v outlets for both the Welder & the compressor so you don't have to unplug anything.
                Ed Conley
                http://www.screamingbroccoli.net/
                MM252
                MM211
                Passport Plus w/Spool Gun
                TA185
                Miller 125c Plasma 120v
                O/A set
                SO 2020 Bender
                You can call me Bacchus

                Comment


                • #9
                  Originally posted by nfinch86 View Post
                  Ihavnfun, Hi ; Sounds like you have some Electrical smarts!! Soooo, My compressor is 5hp., and I'm running it on a dedicated 12ga. wire, is this OK or Not???..... Norm :
                  a real 5hp motor or 5 "craftsman" horsepower?
                  Bobcat 225NT
                  Cutmaster 52
                  Lincoln Weld-Pak 100 buzz box
                  Caterpillar TH63
                  '07 Kawasaki ZZR600

                  Comment


                  • #10
                    Originally posted by nfinch86 View Post
                    Ihavnfun, Hi ; Sounds like you have some Electrical smarts!! Soooo, My compressor is 5hp., and I'm running it on a dedicated 12ga. wire, is this OK or Not???..... Norm :
                    You are fine Norm- the Compressor will draw quite a bit on start up but once running it is probably only drawing 12-15 amps @ 240v.

                    12g is good for 20amps

                    If you haven't tripped the CB on start up yer good.
                    Ed Conley
                    http://www.screamingbroccoli.net/
                    MM252
                    MM211
                    Passport Plus w/Spool Gun
                    TA185
                    Miller 125c Plasma 120v
                    O/A set
                    SO 2020 Bender
                    You can call me Bacchus

                    Comment


                    • #11
                      Whats the difference in Craftsman horsepower?
                      Who do you call when the lawmakers ignore the law?

                      Miller AC/DC Thunderbolt 225
                      Miller 180 w/Autoset
                      Old cutting torch on LPG

                      Comment


                      • #12
                        Originally posted by Flyingpig View Post
                        Whats the difference in Craftsman horsepower?
                        Real HP and what they stick on the label
                        Ed Conley
                        http://www.screamingbroccoli.net/
                        MM252
                        MM211
                        Passport Plus w/Spool Gun
                        TA185
                        Miller 125c Plasma 120v
                        O/A set
                        SO 2020 Bender
                        You can call me Bacchus

                        Comment


                        • #13
                          hi Norm,

                          If the wire or conduit are not getting hot then you are fine. I ran an engine lathe with a 5hp motor on a 12awg line and never had a problem.

                          As was pointed out, the start up is where most of the current draw is, after that it is just idling.

                          The reason I say don't run the MM175 and the compressor at the same time is this. If you are in the middle of a bead on say 3/16 or 1/4" which is near the max according to Miller and the compressor starts on cycle, it may ruin the motor because there is not enough power, that's all. It may cause a thin weld at that time as well.

                          Harold
                          Live Right Have Fun

                          XMT350 CV/CC
                          22A Feeder
                          MM175
                          Dynasty 200DX
                          TB302
                          12vs Extreme
                          Hypertherm PowerMax 1000
                          20" x 40" CNC Mills (2)
                          16" x 60" engine lathe
                          65 Ton edwards iron worker
                          3/16' x 24" power slip roll
                          16' power feed mitering bandsaw
                          and other fun toys

                          Comment


                          • #14
                            nfinch86-Canadian Weldor :

                            Thanks Guys; NO It's not getting even warm! The only thing I have running at the same time as the compressor is my Spectrum 375 Plasma cutter.
                            The plasma cutter is on 240V. and the Compressor is on 120V., so there's no issue there!! Thanks Again... Norm :
                            www.normsmobilewelding.blogspot.com

                            Comment


                            • #15
                              Motors require a wire 125% of the fla rating of the motor. As foir running to the house, is there already other wires feeding the garage?

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