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Tool Talk Discussion Forum

Extension Cord

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JAA59

03-11-2008 05:33:51




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I have a Lincoln Arc/stick welder (goes up to 225 amps). It runs on 220v. Can I make an extension cord for it? What would be needed for wire and fittings? Thanks.




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Cliff (VA)

03-13-2008 08:17:16




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 Re: Extension Cord in reply to JAA59, 03-11-2008 05:33:51  
Since no one else has said this...

With my Miller welder, I went to their website and downloaded the correct manual for my welder (bought used) and there was a table in the manual with the sizing and length requirements of any extension cord.

I would suggest that you follow their recomendations. They've tested it.

HTH

Cliff (VA)
Electrical Engineer



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KLS

03-11-2008 10:02:50




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 Re: Extension Cord in reply to JAA59, 03-11-2008 05:33:51  
If you have one around, silo-unloader cords tend to be the right size, I've got a big old Forney and it worked just fine for me.



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dr sportster

03-11-2008 08:13:02




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 Re: Extension Cord in reply to JAA59, 03-11-2008 05:33:51  
The plug should be three prong.I push the prongs through cardboard to make a template to ensure getting the correct female end at the supply house.Dont skimp on aluminum or romex for this use a suitable S type cord and rough service female end.Proper uses of S cords are listed in the code[laying in water would be different than dry indoor etc,]If you must use a deep 1900 box then you need a strain releif [chinese finger trap type] at the box.The onjly reason to do that is if they dont have the cord type end.[Now its not weatherproof].The other end can be hardwireds directly to a breaker in the panel.Romex as an extension cord lasts about a week or a day if a truck runs it over.Good luck.

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wyod

03-11-2008 08:04:33




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 Re: Extension Cord in reply to JAA59, 03-11-2008 05:33:51  
J...
built mine many years ago, used to have a chart to determine correct wire size for a given load over a desired distance... determined that #8 SO was enough for my welder (approx 40 amps) out to about 40'... you should have no problems with #8 at 25', but if in doubt, use #6... shouldn't be that much difference in price



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John T

03-11-2008 07:00:40




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 Re: Extension Cord in reply to JAA59, 03-11-2008 05:33:51  
59, Ive used them before never any problem. If ???? the welder is a 50 amp straight 240 volt 3 wire (2 Hots plus an equipment ground) like many Ive seen, Id use 6 gauge 3 conductor cord with the appropriate 240 volt 50 amp 3 pole matching plug (same as welder has now to fit into its normal receptacle DUH) n receptacle. The plug n receptacle is easily wired, the two hot (often red n black wires) terminals for the 240 volts plus the green equipment grounding conductor. HOWEVER if the welder (which I doubt) uses BOTH 120 and 240 volts and has a 4 pole plug, then the extension cord n plug n receptace all need to be 4 pole/conductor.

John T Longgggg g retired electrical enginer n a lil rusty on this stuff NO WARRANTY LOL

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JAA59

03-11-2008 07:15:52




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 Re: Extension Cord in reply to John T, 03-11-2008 07:00:40  
It's a 50amp 3 wire. thanks for your help.



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John T

03-11-2008 08:14:08




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 Re: Extension Cord in reply to JAA59, 03-11-2008 07:15:52  
Youre sure welcome, then in that case and since it never hurts to use big wire to reduce voltage drop, Id use 6 gauge 3 conductor (2 hots plus ground) flexible rubber covered cord n the matching 50 amp 240 volt 3 pole plug n receptacle, piece of cake..... ..just buy a plug n receptacle thats just like whats on the welder n the wall now.

John T



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JAA59

03-11-2008 06:45:39




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 Re: Extension Cord in reply to JAA59, 03-11-2008 05:33:51  
I think a 25' cord would be about right.



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Ken Crisman

03-11-2008 06:30:28




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 Re: Extension Cord in reply to JAA59, 03-11-2008 05:33:51  
Depending on how long a cord you're talking about but , I'd use nothing less than 8 guage 4 wire so you can run the welder full capacity . Then of course the appropriate ends . Check at your local electrical supply store as to the type but you want it flexible for various weather conditions & wear of dragging it around . I made my 25' cord out of 6 guage 4 wire with rubber coat exterior ( can't remember if it was SJ or SO or what ) for flexibility . Never had a problem . HTH ! God bless, Ken

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