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Compressor Tripping 15A Breaker on Startup. Help!

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Lawrence Au

06-20-2004 01:04:15




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Hello, I was very pleased to get my new air compressor up and running. Everything was going well. It pumped up to a maximum pressure of 125psi and then I started playing around with the blow gun until the pressure dropped to 100psi where the motor kicked back in. Almost instantly, my household 15 Amp breaker tripped. I tried many times to reset it but it would trip again everytime.

So I bled the pressure off down to about 50 psi and then tried to start it up again. It worked fine, pumping up again to max pressure.

Is there a way to remedy the problem without having to rewire? If not, what's the best way to go about rewiring?

I have a new campbell hausfeld 20 gallon compressor.

Thanks!

Lawrence

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Dean Minnesota

06-20-2004 20:46:21




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
If your air compressor is located a long ways from your circuit breaker panel, you will need to run 220 volt from your circuit breaker panel to your shed or garage, especially if its over say about 75 feet due to the large voltage dropoff. YOU CAN ADD ANOTHER BOX AT THE SITE AND SPIT IT DOWN TO 110 volts again. Voltage drops off much more slowly at higher voltages.



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buickanddeere

06-20-2004 21:08:44




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 Re: Re: Compressor Tripping 15A Breaker on Startup in reply to Dean Minnesota, 06-20-2004 20:46:21  
Not unless you are supplying a transformer with 240 at the shop then supplying the aircompressor with 120 off the transformer. If running 120/240 to the shed the aircompressor will still only see 120 between one live line and the neutral. We are going to have to wait for a reply on the compressor nameplate and house wiring size and length from the service transformer to the compressor motor.

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Ron

06-22-2004 13:49:40




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 Re: Re: Re: Compressor Tripping 15A Breaker on Sta in reply to buickanddeere, 06-20-2004 21:08:44  
Dean from MN is correct. The right way to do this is to run a service from the main breaker box to the garage/shed... 220V with a minimum 40 amp box. As long as he runs the right wire size (consult code book) he has lots of options but at the very minimum he would have the ability to wire one 110V 20 amp dedicated circut which is likely what the air compressor manufacturer's owners manual states as a requirement.

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buickanddeere

06-23-2004 11:30:59




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 Re: Re: Re: Re: Compressor Tripping 15A Breaker on in reply to Ron, 06-22-2004 13:49:40  
How is Dean going to run 240 and then split it at the shed to 120V and reduce voltage drop? The compressor is only going to see one 120V line and the neutral right from the transformer to the motor. The other 120V line will have nothing to do with this 120V compressor. Depending on how his service and buildings are laid out, a new 60 amp panel fed with #6 copper or larger would be the solution and allow future load additions. Supplied from the main service panel or a separate service if it's a separate outbuilding.

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Ron

06-23-2004 13:29:54




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 Re: Re: Re: Re: Re: Compressor Tripping 15A Breake in reply to buickanddeere, 06-23-2004 11:30:59  
That copy of "Wiring for Dummies" is on its way!



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buickanddeere

06-23-2004 17:39:21




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 Re: Re: Re: Re: Re: Re: Compressor Tripping 15A Br in reply to Ron, 06-23-2004 13:29:54  
With Dean's advice the voltage drop on the supply conductors is identical if there was one live line and a neutral 120V. Or two live lines and a neutral 120/240V. He can't use both live lines to reduce voltage drop and get 120V without a transformer.



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Ron

06-23-2004 17:54:37




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 Re: Re: Re: Re: Re: Re: Re: Compressor Tripping 15 in reply to buickanddeere, 06-23-2004 17:39:21  
I forgot! You can't read! Maybe your teacher can read the "Wiring for Dummies" book to you.



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EEENG

06-23-2004 22:21:21




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 Re: Re: Re: Re: Re: Re: Re: Re: Compressor Trippin in reply to Ron, 06-23-2004 17:54:37  
I usually don't say much on this subject as codes vary from state to state. I think with 30 years of exprience and over 6 years of education in this field...My advise would be for Lawrence to consult a local electrican and ask for advice. Most are more than willing to answer most all of your questions. Ron, Glen is correct on the 220v, and using only one leg. As for my own compressors, I use nothing smaller than 10/3. I would rather trip a circuit breaker than melt wires if load of compressor exceeds Max. current draw.
Just my opinion

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Ron

06-24-2004 04:25:59




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Compressor Tri in reply to EEENG, 06-23-2004 22:21:21  
You seem like a nice guy but you are in way over your head.

Read the original post. The breaker blew. That's the subject. The ONLY reason a breaker blows is excessive current draw. Current is expressed in AMPS, hence breakers are rated by AMPS. Voltage has nothing to do with anything.

The sub-panel wiring Dean suggested and I fleshed out is exactly what any electrician does, I've done hundreds, is accurate per the national code, and is the correct solution for the original poster's dilemma.

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EEENG

06-25-2004 22:55:24




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Compressor in reply to Ron, 06-24-2004 04:25:59  
I really hate to disagree with you but voltage has everything to do with it, with out voltage you have no current Ohms Law E=IR. And code on wire is based on the following Equation which detremines the amount of resistance per foot of copper wire R=10.37X(Length in feet)/Diameter squared(in CM)



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buickanddeere

06-23-2004 20:33:16




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 Re: Re: Re: Re: Re: Re: Re: Re: Compressor Trippin in reply to Ron, 06-23-2004 17:54:37  
Ron, do you want to help this guy safely and successfully operate his new compressor? Or just have a contest? Lawrence either needs a dedicated 12 gauge sized wire straight from the service panel to his dedicated 120V compressor receptacle. Or spend a few dollars more and get a 120/240V 60AMP service installed in his work area. Even less voltage drop plus he can now use a welder, pressure washer, electric heat, beer fridge etc without worry of tripping breakers or burning out equipment.

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Ron

06-24-2004 04:30:03




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Compressor Tri in reply to buickanddeere, 06-23-2004 20:33:16  
Nothing sadder than a 9 year old with 'Net access and time on his hands. So long little fella!



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nwb

06-20-2004 19:28:48




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
Sounds like everything is covered. I just want to stress that the wire size must match the breaker. Many 15 amp circuits use 14 AWG wire. If you only up the breaker to 20 amp and do not up the wire size you make the wire your fuse or fire starter. It is not hard, but be safe. This forum is helpful, but if your unsure get an electrician. Better safe than sorry.



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buickanddeere

06-20-2004 11:21:18




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
As previously mentioned tell us everything on the motor nameplate. The code will cross refernce to a chart in the electricions handbook to calculate starting/locked rotor current. The breaker for motor load overcurrent, not overload protection is supposed to be 175% of FLA. Voltage at the motors terminal block/starter switch must be at least 110 or 220V when running. When not pumping the voltage will rise to 120-125/240-250V. Too small cable and too long a run will kill motors everytime. The neighbour who keeps using the too small cord should have his tools taken away before he hurts someone.

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Vern-MI

06-20-2004 06:59:30




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
I'm going to assume that you have it wired 120 VAC and the label indicates that the motor draw is 15 AMP. Startup or inrush current will be at least twice that amperage rating so if you have it connected to a circuit with a fast reacting circuit breaker it will blow on startup. The circuit you are using must be rated 20 amp, 120VAC using at least 12 gauge wire and a duplex outlet rated at 20 amp with screw terminals not those fire starting push-in connections. The compressor should be plugged directly into this outlet without an extension cord if possible. If you must use and extension cord the extension cord must be rated at least a 12 gauge 20 amp and of minimum length to reach the compressor.

I Just went through this episode twice with my neighbor within a one week period. He was using a 15 amp house circuit and a push-in duplex and also a cheap hardware store 14 gauge extension cord. The compressor would start and run up to pressure but once the air was used and the tank pressure dropped to the lower setting of the pressure switch the compressor would try to cycle and the circuit breaker would pop. I brought over a 12 gauge extension cord and plugged it into the 20 amp washer dryer circuit and it worked perfectly. About 4 days later he came over again complaining about the compressor not working right. I couldn't believe it he had plugged it back into the original 15 amp circuit with the cheap hardware store extension cord. We went throught the whole exercise again.

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the other ron

06-20-2004 06:09:08




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
First : look at the label that is on the motor. It will have a lot of info . It will tell you the voltage requirements , horse power and AMP draw at the selected voltage . Compare the amp. draw on the motor to the the breaker rating. You are not trying to run this thing on a long extension cord are you ? It takes a 14 guage wire to safely run 15 amps . A lot of extinsion cords are made with 16 guage wire and a lot of rubber to make them tool big . This info is stamped on the side of the cord . It will say : AWG and then a number . If you are , plug it directly into an outlet and see what happens . If all of this stuff looks good then it is probably trying to start with head pressure . Call the guys you bought it from .

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MAC,IL

06-20-2004 05:26:44




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
You probably should use a 20A fuse, if that fails, install a slow blow fuse of the same amps.



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Greywolf

06-20-2004 04:42:17




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
The fact you could start without tripping @ 50# almost sounds like the bleedoff valve didn't bleed off.

At cutoff pressure, too much strain on the motor to "swing" the compressor. But @ 50# it could no problem.

Might be something to check out.



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Ron

06-20-2004 01:21:47




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 Re: Compressor Tripping 15A Breaker on Startup. He in reply to Lawrence Au, 06-20-2004 01:04:15  
The instructions you got with the compressor tell you the minimum circut requirements which almost always says "dedicated circut". That means the circuit must not be shared with anything else. It may also demand a 20 amp circut.



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pete

06-20-2004 06:23:59




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 Re: Re: Compressor Tripping 15A Breaker on Startup in reply to Ron, 06-20-2004 01:21:47  
Ive been threw this also.I had to run # 12 wire and use a 20 amp breaker.I wish they would stess this info before a person buys it!



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