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How many amps needed for MM251?

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  • DIESELADAM
    replied
    I just realized that there are some great posts on the importance of electrical safety in the "Welder Wiring" Thread.

    Check them out.

    Leave a comment:


  • DIESELADAM
    replied
    Ok guys, correct me if I am wrong.

    Isn't a breaker considered a re-settable fuse??

    If the manufacture reccomends to use a 50amp breaker why would you want a larger one on that circuit if you are dedicating that circuit for the welder?

    For instance, for the MM251 it was stated the a 50amp breaker should be used.

    Meaning the the machine should operate properly on this 50 amp circuit without tripping the breaker.

    So if one were to use a 60 amp breaker on equipment that should "trip" a 50 amp breaker if a problem were to arise; wouldn't that cause for an additional 10 amps of malfunction or catastrophy to trip the 60 amp breaker?

    Resulting in unneccessary damage and stress to the machinery and circuits involved.

    Leave a comment:


  • Bronco STD
    replied
    amps

    Thanks for the information on the Users Guide. I ran the 6-3 gauge wire last night about 25ft of it from the box to the receptacle. I bought a 50amp breaker, thinking that would be enough, but I'll run and get a 60amp before everything is hooked up. I don't think I will be using that many amps to it's fullest potential anyway, but just to be on safe side.

    Thanks for the feedback

    Bronco STD

    Leave a comment:


  • H80N
    replied
    Bronco
    according to the manual it draws 42amps at 230vac and that you can run up to 127ft of 8/3 with a 60amp regular breaker or a 50amp time delay... all the info is on pg 19 of the pdf manual... have enclosed the link...

    http://www.millerwelds.com/om/o1326p_mil.pdf

    hope this helps
    Heiti

    Leave a comment:


  • Paul Seaman
    replied
    The 50 amp should be enough but a suggestion, use a slow blow breaker also known as a compressor breaker since they start under pressure the have high amp start up then drop to normal amperage. The 8ga 3wire should be sufficient for power carrying, If you get an extension make sure it has a thick insulation for the occasional nick or cut, I have a 4/3 and 6/3 extension both are Industrial grade SO cable, it is better to go bigger but don't go crazy remember you still have carry it and move it around. The 4/3 is 100' long and weighs over 100pounds.

    Leave a comment:


  • Grampa
    replied
    Power Service

    I have just wired up a kitchen range receptacle in several shops for the 220..worked fine..used 60 amp double pole breaker.. 6-3 wire size on 60 amp..you can probably use 50 amp if you like and go to 8-3 wire size..Check the National electric code on this and there is a chart to tell you what size wire goes with what breaker..don't have the chart on my desk....While you are wiring it is helpful to also put in a 20 amp dedicated circuit for grinders..drill..saws and things of that nature..

    While you are at this you might wish to look into an extension cord so you can have some more latitude to move around the shop..That cord would be either 8-3 or 6-3 sjt wire..Match the wire size from the breaker..

    Havign a good solid power source makes thigs go better so you are on the right track here..

    makes life a bit easier..

    Take care

    Grampa

    Leave a comment:


  • Bronco STD
    started a topic How many amps needed for MM251?

    How many amps needed for MM251?

    I'm currently looking to purchase a MM251. I have been doing some research on how many amps I need to hook this welder up in my garage. From the Tech Spec. sheet it looks like a 50amp Circuit Breaker with 6-3 gauge wire will be good Since, if I'm reading it correctly that at 200v it pulls 48 amps, which would be the maximum amps the MM251 would draw.

    From the Breaker Box to the receptacle will be about 25-30 feet. I spoke with a Electrician and he seems to think this will be fine. I just found this forum and would like to get the opinion of others.. I did do some searching to see if someone did post this question, but maily it seemed to be for the MM201

    Thanks,

    Bronco STD
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