Wiring Nema 6-50 receptacle
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  1. #1

    Wiring Nema 6-50 receptacle

    I just bought a miller 211 and would like to wire it to my dryer circuit. I have searched and read lots of posts that talk about making an extension cord with a Nema 6-50 input for the welder and a Nema 10-30 output to plug into the existing receptacle.

    However, I can't find a Nema 10-30 plug locally so I just bought a Nema 6-50 receptacle. How do I wire up the receptacle?

    I have white, red, black, and bear wire wires in the box. From reading I think I gather that I wire the red and black wire to the flat blade, and I can wire either the bear wire or white (neutral) to the round blade which is supposed to be the ground for the welder.

    Is this correct? This is a dedicated circuit for the dryer and it is not used for anything esle. My dryer runs on gas and is plugged into another 120v outlet for power. Should I wire the bear wire or the white wire to the round blade in the Nema 6-50 receptacle?

  2. #2
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    Re: Wiring Nema 6-50 receptacle

    ???

    First, call a wildlife removal specialist and get that bear out of your house!

    The plain wire with no insulation on it is the BARE wire and is the ground wire. The ground wire may also have green insulation on it, so bare or green is the ground wire (or is -supposed- to be!).

    Next, if you have a gas dryer that is plugged in to a 120V outlet (NEMA 5-15R or NEMA 5-20R), then why is there a NEMA 10-30R outlet in there? Unless there used to be an electric clothes dryer and now there is a gas one.

    If you are not -sure- of what you have and how to tell or check if it is 'correct', then STOP! Electrical wiring usually isn't rocket science or brain surgery, but if done wrong or poorly it -can- cause problems. Like burning down the house or killing someone.

    That said, the NEMA 6-50 wiring is HOT-HOT-Ground, which if the wiring follows the industry and Code accepted wire colors should be Black-Black(or Red)-Green(or bare). The white neutral wire is not used for the NEMA 6-50 connections.
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  3. #3

    Re: Wiring Nema 6-50 receptacle

    i have the same question. In my garage i have a 14-50 receptacle and want to replace it with the Nema 6-50 for my welder. Should i put a marrette at the end of the neutral wire if it is not used?
    Last edited by gogogsr; 05-10-2010 at 08:43 AM. Reason: more info

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    Re: Wiring Nema 6-50 receptacle

    In older structures and even some new ones, you cannot depend upon the wire colors to be "correctly" wired into the panel box. On the 6-50 plug, you will use the two "flat" blades for your two 110V(more or less) hot legs. In other words go down to your box store (WalMart) or autoparts store and get a 10.00 dollar tester. Test each terminal to determine ground/safety and 110V legs. The two 110V legs should measure in the 220-240 range across the terminals and only 110V to ground. (be careful, hold both test terminals with one hand if possible) If you can trace the circuit back to the box, you should be able to see the wire colors used at the breaker feeding the circuit. If the wire runs uninterrupted, then you can assume that the wire colors have not changed. But if for some reason, the wire is junctioned, then you may want to double check anyway. One of the remaining wires should be used for a ground (probably green). You can put a wire nut on the other wire or trim and tape it.

    The best idea is to run a new circuit from your breaker box if you have the room. If you are using a dryer circuit, you'll need to make sure your dryer is hooked up correctly.
    Last edited by lugweld; 05-10-2010 at 09:59 AM.
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    Re: Wiring Nema 6-50 receptacle

    I am following this post because I am in the same position. I have a new shop with a new panel and need to hook up the welder plug. The box has white and green circuits (?) separate, the white wires are connected to the common from the pole and the green wire from the box is 'bonded" to a rod that the electrician had me bury with the concrete pour. So, does the bare or green wire from the plug go to the white common, or to the green "bonded" side? I am pretty sure it goes to the green, but just want to be safe

    Thanks, Richard

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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by gogogsr View Post
    i have the same question. In my garage i have a 14-50 receptacle and want to replace it with the Nema 6-50 for my welder. Should i put a marrette at the end of the neutral wire if it is not used?
    Yes.
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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by Mooney1el View Post
    I am following this post because I am in the same position. I have a new shop with a new panel and need to hook up the welder plug. The box has white and green circuits (?) separate, the white wires are connected to the common from the pole and the green wire from the box is 'bonded" to a rod that the electrician had me bury with the concrete pour. So, does the bare or green wire from the plug go to the white common, or to the green "bonded" side? I am pretty sure it goes to the green, but just want to be safe

    Thanks, Richard
    You got it right
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  8. #8

    Re: Wiring Nema 6-50 receptacle

    can i plug the welder 6-50 plug directly into a 14-50 receptacle??

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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by gogogsr View Post
    can i plug the welder 6-50 plug directly into a 14-50 receptacle??
    Not Directly

    14-50R (receptacle) needs a 14-50P (Plug)

    They do make adapters to allow you to do this though

    http://store.cyberweld.com/poadne6tone1.html
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    Re: Wiring Nema 6-50 receptacle

    Hey guys first post on here. Im sorry to dig up an old thread, but I have a similar question and decided not to start a new thread.

    I have a 14-50 50amp 230v outlet that is used to charge an electric car, but I would like to use that same outlet for my Miller 211.
    From reading the manual, it looks like I need a NEMA type 6-50r adapter to use this outlet for my welder, but I will also need to make a short extension cord to use the outlet from my welding cart on the drive way.

    I am not an electrician, so can anyone point me in the right direction for what I will need? Is there an pre-made extension cord/adapter I can get, or will I be making this myself?

    thanks!

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    Re: Wiring Nema 6-50 receptacle

    There is an off the shelf short adapter and then you can use an off the shelf welder extension cord.
    Or you can make your own ext. cord with a male 14-50p(Plug) on one and and a 6-50r on the other end.

    I see you are in Los Angeles. If you buy the parts I can show you how to wire it up.
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    Re: Wiring Nema 6-50 receptacle

    If you are not sure what you are doing, just save your own life and buy a cord already made.
    Trial and error don't work so well with 240 power on a 50 amp breaker.
    How many times can you afford to get it wrong?
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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by mad welder 4 View Post
    If you are not sure what you are doing, just save your own life and buy a cord already made.
    Or, if you don't know how to do something, why not just learn how to do it? Replacing a plug or making an extension cord is easy and should be on any handyman's list of skills. IMO, every welder should have at least a basic understanding of electricity.

    The Miller 211 is rated for 25A input, so use some 10/3 SOOW or SJOOW cable (rated up to 30A). To wire the plug/receptacle: green goes to ground, then the other two wires (black/white) go to the side connections (hot/line). Nothing is connected to the middle blade of the 14-50p -- that's neutral and isn't needed.

    Note that this cord would only be rated to 30A while the breaker won't trip until 50A, so you need to make sure not to use this with something else drawing > 30A otherwise you'll be at risk of burning it up (eg. don't charge your car with it). I'm also assuming the cord won't be any longer than 50ft or so -- you may want some thicker cable if you go longer than that.

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    Re: Wiring Nema 6-50 receptacle

    Lincoln puts a 12 gauge cord on their 225 amp stick welder. They recommend putting that welder on at least a 50 amp breaker.
    Cords aren't sized to for continuous run.
    Last edited by mad welder 4; 05-06-2015 at 10:39 PM.
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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by mad welder 4 View Post
    Lincoln puts a 12 gauge cord on their 225 amp stick welder. They recommend putting that welder on at least a 50 amp breaker.
    Cords aren't sized to for continuous run.
    Why do you say cords aren't sized for a continuous run?

  16. #16
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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by Knick View Post
    Why do you say cords aren't sized for a continuous run?
    Because they can be "undersized" based on the duty cycle of the load. For example, 50A @ 100% may require 6awg wire, while 50A @ 30% may only require 10awg or less because there will be much less than 50A draw 70% of the time, allowing the wire to cool off between cycles. (Just examples -- I have no idea what the actual numbers would be).

    So yes, it may be perfectly fine to use 12awg for a 25A load with a <100% duty cycle (as mad welder says the lincoln does). But the cost difference between 10 and 12awg is small enough that, IMO, it's not worth trying to figure out.

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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by ian1386 View Post
    Because they can be "undersized" based on the duty cycle of the load. For example, 50A @ 100% may require 6awg wire, while 50A @ 30% may only require 10awg or less because there will be much less than 50A draw 70% of the time, allowing the wire to cool off between cycles. (Just examples -- I have no idea what the actual numbers would be).

    So yes, it may be perfectly fine to use 12awg for a 25A load with a <100% duty cycle (as mad welder says the lincoln does). But the cost difference between 10 and 12awg is small enough that, IMO, it's not worth trying to figure out.
    Where did you find that info? NEC?

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    Re: Wiring Nema 6-50 receptacle

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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by Broccoli1 View Post
    Thanks

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    Re: Wiring Nema 6-50 receptacle

    Table 630.11(A) for duty cycle.
    Then there is a paragraph on that page or right next to it describing how to size wire and over fuse dedicated welding machine circuits.

    I normally don't do that. For example my plasma cutter and 220v air compressors have 10-30 dryer cords on them, the compressors can run almost continuously drawing 17 and 24 amps before shut off so I put in multiple 10-30 circuits but they are normal, dedicated up to code cloths dryer circuits.
    The only 2 circuits that I have that are over fused and undersized are the 10-50r for my welder. 6 gauge wire and a 60 amp breaker, that's about as close as I get to living on the edge of disaster.
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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by ian1386 View Post
    Or, if you don't know how to do something, why not just learn how to do it? Replacing a plug or making an extension cord is easy and should be on any handyman's list of skills. IMO, every welder should have at least a basic understanding of electricity.

    The Miller 211 is rated for 25A input, so use some 10/3 SOOW or SJOOW cable (rated up to 30A). To wire the plug/receptacle: green goes to ground, then the other two wires (black/white) go to the side connections (hot/line). Nothing is connected to the middle blade of the 14-50p -- that's neutral and isn't needed.

    Note that this cord would only be rated to 30A while the breaker won't trip until 50A, so you need to make sure not to use this with something else drawing > 30A otherwise you'll be at risk of burning it up (eg. don't charge your car with it). I'm also assuming the cord won't be any longer than 50ft or so -- you may want some thicker cable if you go longer than that.
    Good advice! the cord will only need to be 10-12ft long so that shouldn't be a problem.

    Quote Originally Posted by Broccoli1 View Post
    There is an off the shelf short adapter and then you can use an off the shelf welder extension cord.
    Or you can make your own ext. cord with a male 14-50p(Plug) on one and and a 6-50r on the other end.

    I see you are in Los Angeles. If you buy the parts I can show you how to wire it up.
    if you are serious about the offer that would be awesome. Can anyone point me in the direction of a good website or shop in Los Angeles to get these parts from at a reasonable price?

    Thanks again for the help
    Miller 211 Autoset.

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    Re: Wiring Nema 6-50 receptacle

    Text me your info
    Ed
    323-640-3183

    I might have some cord at the shop. I'll check tomorrow.
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    Re: Wiring Nema 6-50 receptacle

    Ed, you are a mench.
    I offer three choices: Good, Fast, & Cheap. You may pick two.

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    Re: Wiring Nema 6-50 receptacle

    Quote Originally Posted by nadogail View Post
    Ed, you are a mench.
    I just learned a new word. And depending on where you are from, it has two spellings. Carry on.
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    Re: Wiring Nema 6-50 receptacle

    Ed Conley
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