How to wire this 240v outlet?

[Onewolf]

Let's start with I have a basic understanding of 120V wiring.

I had two 240V 30AMP circuits run to my workshop when our garage was built. We did not install receptacle/outlets at the time because I wasn't sure how they were going to be used. These circuits have 4 wires (red/black/white/ground) as can be seen by this photo:

The red and black are connected to 30AMP breakers in the panel. The white is connected to the neutral bus in the panel and the ground is connected to the ground bus in the panel.

I purchased 2 Grizzly 2HP 220V Dust Collectors with a bunch of hoses/connectors/etc for $200 off CraigsList. We verified that they run OK when I purchased them.

They are wired like this inside the dust collector which looks like they are wired for 220V:

And the male plug for the dust collector plug looks like this:

The white wire in the dust collector is not connected to anything. Inside the male plug of the dust collector the white wire is combined with the green wire.

What's the best outlet/receptacle to install and how should I deal with the wiring inside the dust collector male plug and inside the dust collector?

I forgot to mention the dust collectors are rated for 9AMPS and 220V.

Thanks.

 

[Alchymist]

I'd use a NEMA 6-15 series plug and receptacle. Use the black, the red, & the EGC. White neutral not used. Wiring appears correct inside the motor housing.

http://www.google.com/imgres?imgurl...d=0CDgQMygHMAdqFQoTCNe55I3O5cYCFcegPgoduOUDsw

 

[Mr. T]

Why not go with a NEMA 14-30? That's what it's wired for?

 

[Alchymist]

Plug shown is a L5-20P twistlock, not a 14-30. A 14-30 is used for dryers. The 6-15 is a pretty common plug/receptacle for 240 use.

 

[LXCam]

Cap the neutral (white) at the recep. At the cord cap (plug) green will go to the bent prone, the screw should be green as well anyhow. Your two line sides will go to the other prongs.

Sorry, I'm on my phone but did just notice you are using a L5-20 plug. You should go get a L6-20 or 30 plug and receptacle.

 

[justsam]

Is that 10 or 12 gauge wire in the box?

 

[Theruse]

Coincidentally today I was trying to figure out the plug/receptable needed for my 220v 30amp wiring for a BendPak lift. I noticed your plug says 30amps 125v. I picked out the same plug at HD, but realized I needed the 30amp 250v version. which looks slightly different. You may want to consider using that plug instead of the 125v.
I am using 10 gauge 3wire red/black/white. So I am trying to figure out if I use a 4 prong rather than a 3prong plug is it ok to not wire one of the leads (green). With a 3 wire I am assuming two for hot and one for ground.

 

[Onewolf]

I capped off the white/neutral in the electrical box and installed a Leviton L6-30 receptacle. Both dust collectors work great!

BTW, the circuit wiring is 10ga.

Now I need to figure out how I want to configure all the dust collector hose/ports.

Thanks for all the quick advice!

 

[Charles (in GA)]

Since no one specifically said, get rid of the twistlock plug for the dust collector, as is says right on it, it is a 125v (max) plug and should not be used if the motor is wired for 240v.

As you do not need a neutral, get a NEMA 6-15 or 6-20 plug and receptacle (commonly found on 240v window air conditioners. You will take the white wire in the wall box and cap it off with a wire nut and not use it (you may need it later if you change the receptacle to a 125/250 receptacle that requires a ground however).

 

[Charles (in GA)]

Coincidentally today I was trying to figure out the plug/receptable needed for my 220v 30amp wiring for a BendPak lift. I noticed your plug says 30amps 125v. I picked out the same plug at HD, but realized I needed the 30amp 250v version. which looks slightly different. You may want to consider using that plug instead of the 125v.
I am using 10 gauge 3wire red/black/white. So I am trying to figure out if I use a 4 prong rather than a 3prong plug is it ok to not wire one of the leads (green). With a 3 wire I am assuming two for hot and one for ground.

You should always wire the green to the green screw in the plug or receptacle. The white wire will not be used in a three prong 240v installation, just cap it off with a wire nut.

 

[wyliesdiesels]

OP- is your workshop detached from your garage?

 

[Theruse]

Charles,

I don't have a green wire, just black/red/white 10gauge 2 wire. So on a three wire plug, I was going to treat the black and red as hot and the white as ground. So if I had to use a 4 prong plug, where do I connect the white?

 

[Theruse]

oops black white and ground

 

[Charles (in GA)]

Is this cable, such as Non-Metallic? or is it flex cord? How old is it? I haven't seen something without a ground in years, though I suppose it may be made for some special purpose.

 

[Theruse]

Long day. I have 10gauge romex from HD. black/white and ground. So can I use a 4 prong plug and not wire one of the prongs.

 

[Alchymist]

Long day. I have 10gauge romex from HD. black/white and ground. So can I use a 4 prong plug and not wire one of the prongs.

You can't use romex with a plug. You need flexible cable, type SJOW preferably. Well, you can, but it's not right.

 

[Onewolf]

OP- is your workshop detached from your garage?

My workshop is in my detached garage: http://www.garagejournal.com/forum/showthread.php?t=250473

 

[CNGsaves]

The top prong on that plug looks burnt !!

+1 to take Sparkies advice and ditch the 125v cord when running 240v !!

 

[wyliesdiesels]

Long day. I have 10gauge romex from HD. black/white and ground. So can I use a 4 prong plug and not wire one of the prongs.

Correct. 240v motors dont need a neutral. So dont use the neutral prong

You can't use romex with a plug. You need flexible cable, type SJOW preferably. Well, you can, but it's not right.

The top prong on that plug looks burnt !!

+1 to take Sparkies advice and ditch the 125v cord when running 240v !!