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  1. #1
    Fireside Member
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    50 Amp to Welder outlet

    Hello,
    I am at my brother-in-law's place and he has a Welder 3-prong outlet box, which doesn't match my 4-prong 50 Amp cable.
    But we exchanged that outlet box for a 4-prong that will plug in. However, (without it being plugged into the RV end), my Power Surge Protector lit up an Error indicating the 'Neutral wire' was missing.
    ...What should we do now?

    Thanks, Craig E.

  2. #2
    Commercial Member
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    Is the welder a 220V welder?

    DO NO PLUG INTO 220 VOLTS!
    Inventory Manager at Tom Schaeffer's RV, Shoemakersville, PA www.tomschaeffers.com
    [email protected]
    2011 RAM 3500 SRW Outdoorsman Edition 4X4, 6.7 Cummins--TWEAKED!
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  3. #3
    Setting Up Camp
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    You need 4 wires 2-hots, 1 neutral and a safety ground. Changing from a 3 prong to a 4 prong outlet just makes the plug fit but doesn't fix the issue.

    The 220/240V is not the issue, your RV uses this but it needs the neutral to make 2 usable 120v circuits. If this wire is ran in conduit you may be able to add the 4th wire, if not you need to run all new wire. The welder could still share this, it doesn't use the neutral wire.
    2021 Imagine 2800BH
    2017 Flagstaff 831CLBSS - Sold 5/2021.

    2017 F150 Super crew, long bed

  4. #4
    Seasoned Camper Chewwi's Avatar
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    Please donít take offense, but if you and your brother in-law donít understand 240/120V wiring hire an electrician that does.


    2020 2600RB,
    2017 Silverado Crew Cab 1500, 6.2L

  5. #5
    Site Sponsor
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    Although 50A service is 240V, it creates two 120V legs which is what everything in the trailer uses, so it does require a neutral.
    2010 Jayco 26(SOLD)
    2011 Keystone Outback 277RL(SOLD)
    2021 Grand Design 268BH
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  6. #6
    Fireside Member
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    Thanks everyone! That some good education
    It sounds like we need to see if a Neutral conduit line can be added.
    If not, do a complete new install; else don't plug in!

  7. #7
    Site Sponsor
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    Very lucky you had a surge protector that kept you from operating!
    John & Kathy
    2014 F250 Lariat FX4 6.2L SBCC
    2014 Reflection 303RLS
    SW Indiana

  8. #8
    Site Sponsor
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    Quote Originally Posted by huntr70 View Post
    Is the welder a 220V welder?

    DO NO PLUG INTO 220 VOLTS!
    50A is 220V.
    2010 Jayco 26(SOLD)
    2011 Keystone Outback 277RL(SOLD)
    2021 Grand Design 268BH
    2013 Ford F250 XLT, 6.2L Gas

  9. #9
    Site Sponsor
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    One of the things that really scare me on forums is people who are not versed in the subject but want to post something anyway,

    Most of the time it isn't an issue. Electrical is the biggie. If you are not familiar with the operating aspects of RV power, please do not post advice. Someone who understands it will shrug it off. A noobie may take it as gospel and that can easily lead to a disaster, destruction of your appliances, and in the worst case, electrocution.
    2010 Jayco 26(SOLD)
    2011 Keystone Outback 277RL(SOLD)
    2021 Grand Design 268BH
    2013 Ford F250 XLT, 6.2L Gas

  10. #10
    Fireside Member
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    Certainly; that said: What was said that was incorrect or just possibly misleading?
    It was all very cautionary as far as I can tell.
    But should be my "takeaway from this" in order to know what to do in my situation?
    Thanks.

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