Wiring a 220v 80gal compressor?

[hondaman263]

Got this awesome compressor in may but haven't even hooked it up yet.

Been waiting on a friend who's an electrician since may to hook it up but he's...lets just say unreliable haha.

So i figured I can hook it up!! I've hooked up the 110 on my garage heater and it wasnt that hard. I know 220 is different, as in you have 2 hot wires and a ground (and maybe a neutral??).

How would I go about doing this? Directly wire it into the breaker box or make an outlet and then have a wire and plug from the compressor? The tag says it has a 205-230v phase 1 22fla motor and I have about 25ft of wire.

Heres a pic of it:

 

[Zrexxer]

No neutral. 220 single phase is two hots and a ground.

The way I do mine is I run conduit from the breaker box to right next to the compressor and install a junction box. Then I run the wire from the junction box to the compressor in flexible BX conduit.

Nice compressor! You're gonna enjoy that.

p.s. you're going to want to acquire a magnetic starter for it, too.

 

[Zrexxer]

Here, you can kinda see the supply coming on from the junction box on the left side of the mag starter...

 

[pattenp]

I ran NM-b in wall from panel to disconnect with flex to compressor.
View media item 16457

 

[Todd.Brock]

I ran 10-2 in conduit to a 30 amp twist lock receptacle. I used a length of 10/3 SOOW to make a 4 ft cord with a matching twist lock plug.
I assume at 22amp, it's listed at 5HP? The motor appears to be thermally protected. From why I understand the magnetic starter isn't required when the motor is thermally protected. It WILL take a lot of strain off your pressure switch, but it's not required.

 

[pattenp]

This is something just to be aware of but outlets for plug in don't have the required HP rating. The highest I've seen is 3HP.

 

[wyliesdiesels]

Got this awesome compressor in may but haven't even hooked it up yet.

Been waiting on a friend who's an electrician since may to hook it up but he's...lets just say unreliable haha.

So i figured I can hook it up!! I've hooked up the 110 on my garage heater and it wasnt that hard. I know 220 is different, as in you have 2 hot wires and a ground (and maybe a neutral??).

How would I go about doing this? Directly wire it into the breaker box or make an outlet and then have a wire and plug from the compressor? The tag says it has a 205-230v phase 1 22fla motor and I have about 25ft of wire.

Heres a pic of it:

Does the compressor list a HP?
What size wire do u have?

Since there isnt an outlet rated for more than 3hp, u will have to hard wire it.

I ran 10-2 in conduit to a 30 amp twist lock receptacle. I used a length of 10/3 SOOW to make a 4 ft cord with a matching twist lock plug.
I assume at 22amp, it's listed at 5HP? The motor appears to be thermally protected. From why I understand the magnetic starter isn't required when the motor is thermally protected. It WILL take a lot of strain off your pressure switch, but it's not required.

Yes, starters take strain off of pressure switches. This is because instead of the 'in rush' current being fed through the pressure switch, its fed through the starter contacts, and all that passes through the pressure switch is the small amount of current needed to energize the starter coil!!

 

[hondaman263]

The wire I have is a very thick coil with 4 wires. Neighbor gave it to me because he had it laying around and said it is very expensive to buy. When I took off the cover to the on/off switch there was a red, black and green wire. From what I understand the white wires are used on appliances that need 120v for timers and what not, not compressors. The green wire is actually grounded onto the compressor.

I'm guessing I have the wrong wire?

And I dont believe it list the hp. Maybe in the book, so i'll check that later.
What's a magnetic starter?

 

[pattenp]

The wire may be okay, you just won't need to use the white neutral. There should be some embossed print on the wire jacket saying what it is. The HP may be on the motor data plate. I think it's 5hp.

 

[pete379]

Here, you can kinda see the supply coming on from the junction box on the left side of the mag starter...

VR5-8 ?? I just got a VR7-8 6 weeks back Nice compressors !

pete

 

[Todd.Brock]

Well I learned something new! I guess I will have to switch to a junction box and flex conduit! While we are at it, the 10-2 runs from the attic into a sweeping 90 elbow through the ceiling and about 5 ft down the wall to the receptacle. It's 3/4" PVC. Is that bad too? I thought nm-b was bad b/ c of temp, but got ok'ed when I was asking about it a couple years ago??

Don't mean to hi jack thread OP sorry!

 

[pattenp]

If it's listed as 5hp then to be to the letter of the NEC the circuit conductors need to be #8 NM-b or #10 THHN in conduit. 5hp = 28A X 1.25 = 35A.

Well I learned something new! I guess I will have to switch to a junction box and flex conduit! While we are at it, the 10-2 runs from the attic into a sweeping 90 elbow through the ceiling and about 5 ft down the wall to the receptacle. It's 3/4" PVC. Is that bad too? I thought nm-b was bad b/ c of temp, but got ok'ed when I was asking about it a couple years ago??

Don't mean to hi jack thread OP sorry!

 

[skulldrinker]

I think you should find another friend. I think you need more practice with wiring before attempting this.

 

[hondaman263]

I think you should find another friend. I think you need more practice with wiring before attempting this.

Could be true. Don't want to fry it

 

[wyliesdiesels]

Well I learned something new! I guess I will have to switch to a junction box and flex conduit! While we are at it, the 10-2 runs from the attic into a sweeping 90 elbow through the ceiling and about 5 ft down the wall to the receptacle. It's 3/4" PVC. Is that bad too? I thought nm-b was bad b/ c of temp, but got ok'ed when I was asking about it a couple years ago??

Don't mean to hi jack thread OP sorry!

What size is your compressor?

 

[BDT/NWMN]

First thing to do is sit down with the instructions that came with your compressor.. Read them cover to cover...

 

[Todd.Brock]

Again, sorry to hi jack thread, but it's a Champion Vr5-8. It has a 5 hp (per motor plate), 22 amp, SF 1.0. It's an AO Smith motor. Thanks!
here is the original thread I referenced. I do not mention the intended usage .
http://www.garagejournal.com/forum/showthread.php?t=136646