Help with a 20 amp breaker for Chinese Compressor

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  #1  
Old 07-04-17, 07:53 PM
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Help with a 20 amp breaker for Chinese Compressor

Picked up a Chinese made compressor for filling my airguns and didn't give the voltage difference a thought. One of my favorite quotes "stupid is as stupid does". I have the space (2 slots) and amps available in my box to add a dedicated outlet. I'd put it just below the panel and I thought I'd have that part covered on the DIY side, but no...

I am lost a bit how this should wire up to the nice new NEMA 6-20 cord and the which wire to run where in the breaker box. Wires on the unit and it's existing plug are as follows.

N is Blue for neutral
L is Brown for live
yellow/green is ground
Which appears to reflect European set ups as near as I can tell.

So my thoughts are that I will have both Blue and Brown hot and the yellow/green will remain ground in order to get the required 220v. I have added a ground to the frame of the unit since one didn't previously exist. That still leaves me without a dedicated neutral though technically the ground ascots as such.

Please chime in.
 
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Old 07-04-17, 08:00 PM
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A 220v motor doesn't use a neutral in the U.S. Is the motor 50Hz or 60Hz. You are aware that the voltage from your breaker box is 240 volts not 220 volts?
 

Last edited by ray2047; 07-04-17 at 09:42 PM.
  #3  
Old 07-04-17, 08:11 PM
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As ray said already, in the US you get 120V and 240V not 220V.

In most cases, your compressor motor will for fine with 2 hots instead of hot and neutral. The only case (at least that I can think of) it will not work is if neutral is connected to the ground or chassis.

Running 220V motor on 240V will make it run faster, but can your motor handle the difference is really unknown unless your motor specifies 240V as working voltage range.
You will have to do it at your own risk.

You can get a 120V to 220V transformer to play safe. Won't be too expensive unless you have a big motor.

Make sure it really is 120V to 220V or at least adjustable transformer. Most cheap ones out there are simple 1:2 transformers and actually make 120V to 240V instead of 220V.
 
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Old 07-04-17, 08:49 PM
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I am aware. I was told the motor would run fine at 240v and would just spin a bit faster due to the variance in Hz. Just everything I'm used to seeing is 4 wire so I wanted to make certain.

That brings me to the breaker though. My box is a Challenger since the house was built in the 90's. I need to install a 20amp. Please correct me if I'm wrong, but I need a two pole-single throw breaker. And I'm planning on running a section of 10-2 wire between the new NEMA and the breaker.
 
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Old 07-04-17, 09:48 PM
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Please correct me if I'm wrong, but I need a two pole-single throw breaker.
Yes. (All common breakers are single throw.)
And I'm planning on running a section of 10-2 wire between the new NEMA and the breaker.
You only need 12-2 for a 20 amp circuit. What is the full load amps of the compressor.
 
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Old 07-05-17, 07:19 AM
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I just happen to have 6 feet of 10-2 that's collected dust for a number of years so I figured I'd put it to use. I believe that the little compressor draws about 12 amps at start up.
 
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Old 07-05-17, 01:13 PM
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BTW, the proper breaker for that Challenger panel is an Eaton / Cutler BR series part number BR220. Still a well-supported panel, but now under different corporate ownership. Should be less than $10 at Home Depot or any Eaton dealer.
 
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Old 07-06-17, 05:24 PM
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Info on the breaker cross reference is Much appreciated!
 
 

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