On Wed, 04 Sep 2013 23:24:37 -0400, wrote:

On Thu, 05 Sep 2013 09:26:57 +0700, John B.
wrote:

On Wed, 4 Sep 2013 08:07:54 -0700 (PDT), stryped
wrote:

I have a new 5 horse 80 gallon upright ingersol rand compressor. I need to wire it up. My outlet
I wired years ago in hopes of having a new compressor I ran 4
conductor cable. red,black,white, and ground. My compressor has
connections inside the pressure switch but only three. Red and black I
understand, however do I put the white neutral on the third spot in
the switch or do I put the ground there? This is in my detached garage
with a 100 amp sub panel. Just want to make sure it is right.

Also, I assume a dryer type plug is not a good Idea and I need a disconnect with the wire from it to the compressor in armor shield?

I appreciate it!

Is your motor single phase or 3 phase? Is your electrical service
single phase or 3 phase? The web shows compressors in both 1 and 3
phase and several voltages.

(experience has shown that mixing requirements and service is usually
not effective :-)
5hp is generally 240 single phase. Anything bigger is GENERALLY 3
phase.

And since the switch has only a red and a black connection it is
almost CERTAINLY single phase 240.

Well, I looked on the web and that model seems to be sold with a
230VAC, 1 phase or 200VAC 3 phase or 230VAC 3 phase or 460VAC 3 phase
motor - see
http://www.autobodytoolmart.com/inge...p-p-16658.aspx

I once connected 440 VAC three phase to a two wire and neutral wiring
system which rather convinced me that it was probably a good idea to
be sure of what I was doing before I switched on next time :-)
--
Cheers,

John B.