revisiting 220 extension cord.

[sickboi55]

so, 3 prong the ground and neutral are connected. and 4 prong they are seperate. hmmmm. so what the heck do you do if the welder/compressor is 3 prong and you want to run an extension cord to the dryer plug?

 

[cdent]

I've used one for a while to run a 220v motor. It should just be two hot legs and ground. I left the nuetral disconnected. I don't think nuetral and ground should be connected until they are inside your service panel, but maybe an electrician can comment.

 

[LoneGunman]

Leave the neutral disconnected. The ground and neutral should not be connected at any point other than at the first means of disconnect.

 

[Matti]

IIRC the neutral is required only with a 4 prong plug when the load also uses 110v. Just buy cable with black, red and ground/green wires. I bought some last week (8/3 cabtire) Based on some reading today, the only time the neutral and ground are bonded together is in your main panel and not in sub-panels or other branch wiring.

 

[g935cab]

hey guys , sorry to thread jack , was wondering what lenght cords are you using say you use 10-3 0r 8-3 what would be mav lenght be out of a dryer plug ? 50'-150' thanks ,just an average would be fine i still have fuses in my house 60 amps max on my dryer outlet

 

[LoneGunman]

hey guys , sorry to thread jack , was wondering what lenght cords are you using say you use 10-3 0r 8-3 what would be mav lenght be out of a dryer plug ? 50'-150' thanks ,just an average would be fine i still have fuses in my house 60 amps max on my dryer outlet

Too many variables, voltage, wire size, length, amperage, what can your equipment handle in terms of operating on a lower than called for voltage.
Heres a link so you can figure it out.

http://www.southwire.com/voltagedropcalculator.jsp