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    How to convert 4 prong 240VAC to 3 prong 240 VAC.

    Asked Sep 30, 2008, 04:40 PM 5 Answers
    My generator has a 4 prong 240 VAC outlet. I would like to convert it to the 3 prong 240 VAC house plug to connect it to the transfer panel inside the house. Of course the two live 120 VAC stay, I just do not know what to do with the ground and neutral.

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    Last edited by Curlyben; Sep 30, 2008 at 09:01 PM.
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    5 Answers
    me22469's Avatar
    me22469 Posts: 12, Reputation: 2
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    #2

    Dec 4, 2008, 06:34 PM

    Put ground and neutral under same lug
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    stanfortyman's Avatar
    stanfortyman Posts: 5,300, Reputation: 264
    Electrical & Lighting Expert
     
    #3

    Dec 5, 2008, 03:38 AM


    Quote Originally Posted by me22469 View Post
    put ground and neutral under same lug
    NO, do not do this.


    Peter, you should NOT have a 3-prong 240v plug at your transfer panel! Who installed this?
    You MUST have a 4-wire 120/240v inlet for your transfer switch/panel.

    Can you describe the setup a bit better? How is your inlet configured?
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    Peter Bernat's Avatar
    Peter Bernat Posts: 2, Reputation: 1
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    #4

    Dec 5, 2008, 03:37 PM
    Quote Originally Posted by stanfortyman View Post
    NO, do not do this.


    Peter, you should NOT have a 3-prong 240v plug at your transfer panel! Who installed this?
    You MUST have a 4-wire 120/240v inlet for your transfer switch/panel.

    Can you describe the setup a bit better? How is your inlet configured?
    My friend installed it. The ground and neutral from the generator are wired together and plugged in to a 3 prong inlet. Connection on the transfer side of the panel are 120 VAC one side 120 VAC the other side and ground/neutral together connected to the ground of the transfer panel. If I change this to separate ground and neutral and connect these accordingly into the panel with appropriate size wire #6 or #8 would this be acceptable?
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    maicomais's Avatar
    maicomais Posts: 1, Reputation: 1
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    #5

    Jul 27, 2009, 02:16 PM

    My generator has a 4 prong circular outlet, and I want to make a extension cord that will convert that to a 3 prong outlet so I can connect my little arc welder to it. How can I do that?
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    stanfortyman's Avatar
    stanfortyman Posts: 5,300, Reputation: 264
    Electrical & Lighting Expert
     
    #6

    Jul 27, 2009, 03:00 PM


    Quote Originally Posted by maicomais View Post
    my generator has a 4 prong circular outlet, and i want to make a extension cord that will convert that to a 3 prong outlet so i can connect my little arc welder to it. how can i do that?
    Why not start a new thread since your question is completely unrelated to the original post, which by the way is almost a year old.

    In that new thread tell us what the input amperage is of your welder and what the amperage of the twist-lock receptacle is.
    Helpful

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