diagram for 110/220 pigtail here

**MAD4metal** · 08-10-2008, 04:01 PM

See this thread...... viewtopic.php?f=17&t=230

**robrob** · 09-10-2009, 09:27 AM

The link is dead

**Gadget** · 09-10-2009, 12:18 PM

Thanks for pointing that out Rob and welcome to the forum. It is probably pointing to a path that didn't get moved when the forum back end was changed a year or so ago. I will see if I can find the post and get the image relisted.
Dan
Rob, I believe that post was removed as a safety hazard by the user. Here is a link to the explanation. The last post is the explanation and how to make it work safely. There is no diagram however.

110 220 pigtail

**KHK** · 09-10-2009, 01:36 PM

Procied at your own risk!!

**robrob** · 09-11-2009, 05:34 PM

Thanks Keith & Gadget. This looks like a good, safe way to wire for dual voltage.

Rob

**junes** · 09-11-2009, 05:50 PM

This is fairly easy and routine I have tons of pitails for my welder
that go from single phaase 220 to three phase 480 and everything in between in both single and three phase.

**weldingtwopotatoes** · 09-30-2009, 01:54 AM

Exactly what I was thinking of doing, good to see others have already done it.

**KHK** · 09-30-2009, 04:04 PM

Watch the machine SPECS, not all machines are dual voltage!

**weldingtwopotatoes** · 10-01-2009, 01:38 PM

Thanks for the heads up KHK. I have a 520D so I should be good on the dual voltage, just need to make sure the wires all go in the right places.

**robrob** · 10-01-2009, 02:13 PM

I made a pigtail using Keith's diagram. I bought a 20 amp, 12/3 (12 gauge 3 wire) 110 volt extension cord from Home Depot for my 110 volt pigtail. 110 volt wiring has the hot (black) wire connected to the narrow blade, neutral (white) connected to the wide blade, and ground to the central pin.

I cut off the female end of the extension cord and installed the female 250 volt 50 amp socket. I wired the extension cord's green wire to ground, black (hot) wire to the narrow blade, and white (neutral) wire to the wide blade. The extension cord was $25 and the 250v female plug was $13.

A welder rated for 40 amps at 220 volts will need at least 12 gauge wire (20 amp 110v extension cord), a 30 amp welder can get by with a 14 gauge (14/3) 15 amp extension cord.

The missing piece of the 110v pigtail puzzle is which power cord wire from the welder is connected to the 110v hot (black) wire. Your dual-voltage welder's manual should specify. In one of the manuals I saw they specified the welder's yellow wire for 110v hot so you would make sure it was connected to the 220v power plug's narrow blade, the other hot wire to the wide blade, and the ground wire to the ground pin. You would then wire your 110v pigtail as described in the previous paragraph.

If your 220 volt plug doesn't have narrow and wide blades, just make sure the plug is wired so the correct wire is hot when connected to your 110v pigtail.

If your dual-voltage welder manual doesn't specify which of the two power cord wires should be hot for 110v you could just pick one and give it a try but it is possible you could damage the welder if you guess wrong.

If you have a dual-voltage welder (I don't-pyet) please chime in here and let us know what your manual says or what worked for your brand and model welder.

Rob

My Home Depot Special 110 volt pigtail: