4 Post Dryer Plug Wiring

[JCTX]

I've got a Millermatic 175 mig welder which I'm trying to wire to my 4 post Dryer outlet. I'm using a 25' 10/3 extension cable. The dryer outlet consists of 4 posts..........two flat spade terminals side by side, a round terminal on top, and an "L" shaped terminal on the bottom (I believe it's a 30 amp). My 175 plug has a small spade teminal on the left, a larger spade terminal on the right, and a round terminal at the top. The 10/3 cable has a green, white, and black. I was hoping someone here on the forum could help as far as the wiring goes.

Thanks in advance.

[JCTX]

Correction to the post above, the cable is 8/3, not 10/3.

[triggerman]

The receptacle that fits your MM175 is a NEMA 6-50 (nicknamed Welder outlet) which can be had at Lowe's/Home Depot or the like. It slightly resembles a regular 120V outlet. The hot wires attach to the outside lugs and the gound wire to the round lug. The 4-wire dryer receptacle (probably) has a black and a red (hot wires), a white (neutral) and a green (ground). The white neutral does not get connected to the new 6-50 receptacle. Leave it capped off inside the box.

Hope this helps.

[JCTX]

Yes, I already have both receptacles which I got from Lowe's. So black and white to both hots, and green to ground, neutral not used.

That'll do it!!

Thanks!

[Broccoli1]

Yes, I already have both receptacles which I got from Lowe's. So black and white to both hots, and green to ground, neutral not used.

That'll do it!!

Thanks!

NO!

Black, RED and Ground Do not connect the white-

ahh I see you are making an extension cord- So yes

[Woodshed]

I was allways told that you never change out the wall plug only change pigtails to match the wall plug. The 4 prong has 2 hot 1 ground 1 netural which is the new code. The three plug has 2 hot and 1 ground-netural. Three prong netural and ground sre the same.