OT: Wiring Questions - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-22-2005, 01:26 PM Thread Starter
 
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OT: Wiring Questions

I'm looking on buying a new air compressor and have a few questions. It is a 220 volt belt driven unit. I don't have a deticated 220 outlet so I will wire it for 120. Do I need a different gauge cord to go from the motor to the pressure switch? I am assuming I do because there will be an increase in amperage. Anyone have any experience with this?
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post #2 of (permalink) Old 06-25-2005, 03:52 PM
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Re: OT: Wiring Questions

its all greek to me, good luck and what out for sparks. [img]/ubbthreads/images/graemlins/wink.gif[/img]

theres one thing i try to stay away from and thats wireing things.
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post #3 of (permalink) Old 06-25-2005, 08:35 PM
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Re: OT: Wiring Questions

If Jason doesn't reply to this (he's the first one that comes iot mind for wiring) by Monday, I'll ask one of our engineers at work to look it up. They've all got these neat little wire size calculators that they use on a regular basis. Example, the pump station has a 75 HP 480V 3ph motor, and the circle requires so much power, the distance is this far; what gauge of wire do I need to run from the meter base to the feeder?

FWIW, we use 14ga THHN to wire preasure switches in for irrigation use.
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post #4 of (permalink) Old 06-26-2005, 08:23 AM
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Re: OT: Wiring Questions

i do know the bigger the wire the better.

i wouldnt run some little stuff to compressure. that wire will more than likly get hot.

i cant remember what gauge i used on my rear Hellas, due to the longer distance i wanted to run some beefy wire. never had any problems. have two hella 550s runing off a relay. also used the same set up on the front pair of KCs
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post #5 of (permalink) Old 07-06-2005, 03:43 PM
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Re: OT: Wiring Questions

Mike...first, you have to find out if the motor can be wired up for 110VAC. Some motors are dual voltage and can be wired for either 220 or 110.
The current draw will be double at 110 VAC vs 220 VAC.
Rule of thumb...14g wire for 20 amps 8g for 40 amps.

You need to look at the motor draw (assuming it will run on 110VAC). What ever the current at 220VAC is, double it for 110VAC.

In most houses, the garage is wired for 15Amp 110VAC....unless someone rewired it.

If the motor is going to pull 20A at 110VAC, and the CB feeding the garage is 15A, don't try replacing the CB wtih a 20A...good way to start a fire.

Unless you have a real old house, you may have 220 available. The typical house that hase more than 100amp severice actually has 220VAC going to it. You have 2 110VAC lines with a common return (that's the white wire). Pick either 110 line and connect it to common and you have 110VAC. Take 2 110VAC lines, and you have 220VAC. If you look at your breaker panel, you will see two rows of CB's (usually). If you look at one side, the first CB is one 110 line. The one below it is the other 110VAC line. If you take the output from both of those CB's, you now have 220VAC.

Clear as mud...right?
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