Adding compressor to 220v in my garage

[arlen4720]

Ok lets start with the wire that is feeding the existing welder outlet it's type SE..



To me the circuit as run now is legal but as soon as you put the existing wire into a panel then it changes to a remote panel feeder..

I agree that is becomes a feeder...So What?
The uninsulated conductor IS only used for equipment grounding purposes. I just want to know why you think a remote panel serving only line to line loads needs 4 wires...There is simply nothing in the code that says that. A grounded conductor (neutral) is not required to be extended beyond the service unless needed.
Have you did much work in factories? Many, if not most of the panels do not have neutrals ran to them. On a 480/277 system, only the lighting panels have neutrals.

If I was the OP, and starting from scratch, of course I would run 4 wires to a new sub panel for maximum flexibility, but he does not have that luxury.


Sub panels serving only line to line loads with no neutral is a common, accepted, and legal practice.

Like I posted before, I like to encourage people to ask the local inspector before doing anything out of the norm.

The use of the term "sub panel" is also an accepted industry term for a "remote panel"

 

[Xfaxman]

My bad - meant to say 10 gauge. I fixed my post to reflect that.

All I have out there is three wires - black, white and un sheathed twisted aluminum. The welder only has three wires as well. I called the compressor (Campbell Hausfeld) manufacturer and they want 10 gauge run behind a 30 amp double throw breaker.

Nobody has commented on the hot white wire. Does it need red tape on it where ever it is attached?

I am not an electrician, just have seen it done that way.

 

[arlen4720]

Nobody has commented on the hot white wire. Does it need red tape on it where ever it is attached?

I am not an electrician, just have seen it done that way.

It is good practice to identify it like you say, so people know it's not the grounded conductor (neutral). Good point.:thumbsup: