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Tool Talk Discussion Forum

help installing 220 aircompressor

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perry

02-17-2004 16:30:56




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i just purchased a 220volt 15amp air compressor that i plan on hooking up myself,but i dont have any clue on 220.my question is how do i know if i have 220 running to the garage???.i had the breaker box installed professionaly awile back.it runs from meter box on house to a double glass fuse box mounted next to it on house,then go's under ground to a detached garage{20ft}.my box in the garage has a black wire,and a red wire going to a 60 amp main breaker,and a white wire going to the silver power bars.they must be about a 6 gauge wire size{they are big}the breaker box has spots to install up to 12 breakers. im in the process of running wire and installing my own plugs and lights.im just clueless on how 220 hooks up. does anybody know of any infomation on the internet for the 220 hook-up,and what parts i need to purchase...thanks

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buickanddeere

02-19-2004 06:09:37




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 Re: help installing 220 aircompressor in reply to perry, 02-17-2004 16:30:56  
Rather than trying to save a few bucks and risk life, limb and property. Call the electrician back have him properly wire the compressor. This is not a task for persons without proper tools,parts and experience/knowledge. The tradesman gets his material for wholesale while you pay retail. The pro doesn't cost much more. Get a receptacle tester and check all the 120v/15A plugs, suprising the number we find that are wrong but "work".

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Keith -OR

02-19-2004 01:12:46




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 Re: help installing 220 aircompressor in reply to perry, 02-17-2004 16:30:56  
Myself I would nothing smaller than 10x3 wire to run a 220---230 volt/15amp compressor. also I would use a 25 amp breaker for 15 amp compressor. Cause it will surge to around 20 amps, maybe even more, on start up. I used a 20 amp on my compressor at first, kept tripping the breaker. So I measured the current on startup, would surge above 20 amps. Which was the limit of my breaker, change to a 25 amp breaker no problems now.

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John

02-17-2004 22:34:42




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 Re: help installing 220 aircompressor in reply to perry, 02-17-2004 16:30:56  
Yes you have 220

Get the name of your elec box and go to a elec. supply to get your breaker. Differant boxes use differant breakers. Ask them to show you the proper hook up so you can SEE IN PERSON how it hooks up. If in dought call some one that knows how to hook it up for you.

Things to notice in your box.

The bar with the white wire is the netural and will not be used for 220 compressor hook up.

On the other side of the box there should be a bare copper wire hooked to a bar. This is your ground and is where you will hook the ground to.

A 220 breaker would use 2 of your 12 spots and they must be next to each other.

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Lowes or Home Depot...Joh

02-17-2004 18:30:58




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 Re: help installing 220 aircompressor in reply to perry, 02-17-2004 16:30:56  
Lowes or Home Depot stores generally have mock-up panel and branch boxes which are wired-up for display purposes. They both retail all of the necessary parts and pieces, too.



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david - OR

02-18-2004 08:05:41




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 Re: Re: help installing 220 aircompressor in reply to Lowes or Home Depot...Joh, 02-17-2004 18:30:58  
While the displays are a helpful reference; they should not be relied upon.

My local Home Depot has such a display. The setup has 3 code violations resplendent behind plexiglass. I cringe when I think of all the homeowners copying its "teachings", especially because these issues are common errors.

(For those interested: 1) No grounding electrode is provided or wired 2) The main panelboard is not bonded to ground 3) The subpanel has the ground and neutral tied together)

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Perhaps..John,PA

02-18-2004 10:44:48




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 Re: Re: Re: help installing 220 aircompressor in reply to david - OR, 02-18-2004 08:05:41  
Whenever I see things as you described, I generally try to help out others by gett'n hol;d of the store manager and bringing such to his (her) attention. In trying to help, though, sometimes I git into trouble with the manager. Their favorite comment is "Just who are you"?.

Lowes, on the otherhand, generally wants to know about things going on. RE: they had a new refrigerator on display that had a stuck compressor. I told the store manager about it and was thanked.

So, at HomeDepot, suggestions can be "risky".

Hope this helps.

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Craig

02-17-2004 16:42:05




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 Re: help installing 220 aircompressor in reply to perry, 02-17-2004 16:30:56  
since you have a black and red wire in your garage fuse panel, you have 220 volt service. to hook up your compressor, you will need a 20 amp 220 breaker, 12 AWG wire, and the proper oulet. the 220 breaker looks like a regular breaker, but takes up two spaces and has the handles connected so they work as one. if you are using pipe for your wires, use 2 balck wires OR 1 black wire and 1 red wire. if you are using romex, use 12-2, but wrap black tape around the white wire at each end to identify it as a hot, not a neutral.

connect one of the wires to one terminal on the breaker and one wire to the other terminal. do the same on the outlet. it does not matter which wire is connected to each side like it does with a 120 V outlet. you will not have a neutral wire in this system. if you are using romex, connect the bare ground wire to where the other ground wires are connected in the breaker box.

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perry

02-18-2004 18:56:36




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 Re: Re: help installing 220 aircompressor in reply to Craig, 02-17-2004 16:42:05  
thanks for the info, it has helped .im having my father in-law coming over this weekend to help guide me thru..ill let you all know how it goes



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buickanddeere

02-19-2004 06:13:30




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 Re: Re: Re: help installing 220 aircompressor in reply to perry, 02-18-2004 18:56:36  
What is the "code" number as well as the other nameplate data? We can look up what the starting current will be. Odds are it will be at least 90 amps initially and 45 amps until up to speed.



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