06:17PM | 12/28/06
Member Since: 12/27/06
2 lifetime posts
I recently bought a 60 gallon air compressor. I am installing it in my basement so I need to hook it up. I have had one electrical project in my past, so I am not electrican savy. I can figure stuff out with help.

Air compressor specs 230 Volts 17.5 amps. Compressor is about 35 feet away from electrical box.

I was going to run 12 guage wire and use a 220 breaker. The question is the breaker has 2 screws on it for the hot wire. Do I need to run two hots. What about a neutral. I am not hooking up a receptical I am wiring directly to the air compressor. The air compressor has 2 prongs for electricty coming in and the base of the box has a screw for a ground for the conduit or bare ground.

I am confused, if I have to run two hots since my breaker can allow for 2 wires and I need to run a netrual (because that what I would do for a singe pole) how do I hook up 3 wires to 2 prongs on the air compressor.


08:00PM | 12/28/06
Member Since: 04/25/05
1915 lifetime posts
What is the horsepower rating on the MOTOR NAMEPLATE. A hp rating anyplace else is often a advertising number and not really meaningful.

But often you will just find an SPL (special) on the nameplate and are limited to working with the current rating.

Based on that you can use #12 wire. But you should use a 40 amp breaker.

YES, THAT IS RIGTH 40 AMP BREAKER. The breaker is not to protect the motor. It has builtin overload protection.

The breaker is only to protect the wiring from a short, as this is a dedicated load.

Get a book on wiring or go to the library. Make sure that it covers 240 circuits.

But use caution in that most of them will focus on washers and dryers which use 120/240.

The compressor is similar to an aircondition and it only uses 240.

You will need 2 hots and a ground. There is no neutral.

So if you use cable you will only have a black and white (and ground). What you do is to Remark the white wire to indicate that it is a hot.

Use tape or marker. Typically black or red, but can be any color except white, gray, or green.


09:18PM | 01/09/07
Member Since: 01/09/07
198 lifetime posts
Like BillHart said, you do not need a neutral to operate this compressor.

But you might consider using a 12-3 w/g cable for this. This would have a black, red, & white wires, plus a bare ground wire.

This would only cost a bit more now, and leaves open the option of using this for a pair of regular 120V outlets in the future.

For your compressor, you would wire the black & red wires to the terminals, and just cover the white wire with a wire nut and leave it unconnected in the box. But if someday in the future you want to change this, you will have the wires for 2 separate 120V outlets at this location.

Easy enough to do this now, and not much more expense. Much easier than retro-fitting it someday in the future, especially if these wires are inside walls or ceilings.


09:52PM | 05/17/17
You'd mentioned:

"But you might consider using a 12-3 w/g cable for this. This would have a black, red, & white wires, plus a bare ground wire."

What is WG?


06:08AM | 05/18/17
wg means with ground.
Click to reply button Inspiration banner


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply choose button


Post new button or Login button

To test the boundaries of small-footprint living, interior designer Jessica Helgerson moved her family to a 540-square-foo... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled mudroom will get you in the outdoor mood. Grab your coat ... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... This roomy boot tray made from punched metal stands up to all the elements. Station it in your mudroom or at your back doo... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... FLOR tiles are an affordable way to customize a carpeted floor covering for any space. Make anything from runners to wall-... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... First dress up your metal shelves with a coat of paint in an accent color that complements your kitchen decor. Then arrang... Dark wood shelving and a matching upholstered bench keep this closet sleek and refined. The large window brightens the sub...
Follow banner a
Newsletter icon Flipboard glossy Facebook Twitter Pinterest Youtube Rss icon