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Old 10-02-2011, 09:11 AM   #16
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Detached Garage electrical wiring


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Originally Posted by Jim Port View Post
As was already pointed out you can only have 360 degrees of bends between pull points. You need to change your conduit run. You will get hoarse cursing if you try to pull with the current setup.
BTW, "changing your conduit run" could be as simple as replacing one of those elbows in the middle with an LB. I'd definitely also put one at the garage where you transition from horizontal to vertical to make your pull easier (depending on which way you pull, of course).

I hope you know that 3 x #3 (310.16) + #8 ground (250.122) means you're going to need a minimum PVC conduit size of 1-1/4". If you're near max on your 90s, you should consider increasing that too to make your life a little easier. Pull wax is going to be your friend.... You could downsize your neutral since you have so much 220V load, but the small savings in one run now will limit you in the future.

You might want to get prepared for the cost too. 100A two-pole breakers are ~$30 and #3 is >$2/foot at an apron store, IIRC. Don't forget that you'll also need a ground terminal block for your panel and, since it's detached, 2x ground rods and wire.

I had planned to run 100A to my garage, but I reworked my plans for cost and got down to 60A load calc. The savings on the feeder alone was substantial, and I didn't really have to give up that much load.

Matt

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Old 10-02-2011, 09:30 AM   #17
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Detached Garage electrical wiring


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So tell me what you think about this

2 double poll 100 amp breakers - NO just one for your main panel

2 heaters- 2 double poll 30 amp breakers OK

1 welder outlet double poll 50 amp OK

1 double poll 20 amp for outlets around the garage, this should be enough for my craftsman compressor and other tools I may use in the future?
A double poll - will you be doing a muliwire branch circuit? I wouldn't do a MWBC in a garage as the home run won't be that long.
Do you think you may need a 240 receptacle for anything?


15 or 20 amp single poll for the lights? I have 4 10ft 2 bulb florecent fixtures (8 bulbs altogether) may add more fixtures in the future, is it a good idea for my 2 garage door motors also go on this circuit?
Maybe on 15 amp for lights and one 15 amp for the openers
This would be a good choice for a panel for the circuits you have planned:http://www.lowes.com/ProductDisplay?...llow&cId=PDIO1
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Old 10-02-2011, 11:41 AM   #18
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Detached Garage electrical wiring


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This would be a good choice for a panel for the circuits you have planned:http://www.lowes.com/ProductDisplay?...llow&cId=PDIO1
Hey you said I just need 1 100 amp for my main panel? What one are you referring to the one in the house or in the garage? I thought I would need one at the house to turn the juice on to the garage and one at the garage.

Edie: maybe your saying I only need one because one will also come with the load center, but I only need to buy 1 extra

also about the 20 amp double poll. I was reading that garage tools will run better and last longer on a 240

"In the US, electrical house wiring is fed by 120 volts. However, by picking up the second hot leg in your panel, your garage electrical wiring can deliver 240 volts. Why bother? Devices like saws and compressors work better, smoother and last longer running at 240 compared to 120" that is from this website http://www.home-garage-help.com/gara...al-wiring.html

Last edited by wonderd; 10-02-2011 at 11:46 AM.
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Old 10-02-2011, 11:49 AM   #19
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Detached Garage electrical wiring


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Hey you said I just need 1 100 amp for my main panel? What one are you referring to the one in the house or in the garage? I thought I would need one at the house to turn the juice on to the garage and one at the garage.
Since your garage is detached, yes you need a breaker in both panels. So, get a regular load center panel for the garage which will include one 100A+ disconnect plus a bunch of breakers. If you got a main lug panel, you'd have to buy two 100A breakers and backfeed your sub, which would be more expensive.

Matt

Edit: The "breaker" in the sub is really just a disconnect, so it can exceed the ampacity of the feeder.

Last edited by gatorheel; 10-02-2011 at 01:10 PM.
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Old 10-02-2011, 11:53 AM   #20
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Detached Garage electrical wiring


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Originally Posted by wonderd View Post
Hey you said I just need 1 100 amp for my main panel? What one are you referring to the one in the house or in the garage? I thought I would need one at the house to turn the juice on to the garage and one at the garage.

Edie: maybe your saying I only need one because one will also come with the load center, but I only need to buy 1 extra

also about the 20 amp double poll. I was reading that garage tools will run better and last longer on a 240

"In the US, electrical house wiring is fed by 120 volts. However, by picking up the second hot leg in your panel, your garage electrical wiring can deliver 240 volts. Why bother? Devices like saws and compressors work better, smoother and last longer running at 240 compared to 120" that is from this website http://www.home-garage-help.com/gara...al-wiring.html

120v tools run on 120v and 240v tools run on 240v.
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Old 10-02-2011, 12:29 PM   #21
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120 tools will run on 240, at least until the smoke comes out.
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Old 10-02-2011, 12:37 PM   #22
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120 tools will run on 240, at least until the smoke comes out.
True.
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Old 10-02-2011, 01:16 PM   #23
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Detached Garage electrical wiring


Quote:
Originally Posted by wonderd View Post
"In the US, electrical house wiring is fed by 120 volts. However, by picking up the second hot leg in your panel, your garage electrical wiring can deliver 240 volts. Why bother? Devices like saws and compressors work better, smoother and last longer running at 240 compared to 120" that is from this website http://www.home-garage-help.com/gara...al-wiring.html
Here is the complete paragraph:

Do you need 240 volts in your garage (US)?
In the US, electrical house wiring is fed by 120 volts. However, by picking up the second hot leg in your panel, your garage electrical wiring can deliver 240 volts. Why bother? Devices like saws and compressors work better, smoother and last longer running at 240 compared to 120. This is especially true for motors larger than HP. Also, heaters that run on 240 are much more efficient than heaters that run on 120. In fact, a 240 heater will give you thousands more BTU's for the money. For more on garage heat, check out this page.. Many types of clothes dryers, welders, grinders, routers, battery chargers, and other tools are designed specifically to run on 240. So, if you're planning on doing any automotive or project work in your garage, then definitely install a 240 circuit.


I wouldn't say the person who wrote this has a complete understanding of electrical power.

For you 100 amp breaker, you will need one in the house main but the panel contractor kit I linked comes with a main breaker. It also has two double pole 30 amp breakers.
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Old 10-02-2011, 03:44 PM   #24
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okay i understand, but should I have my basic 120v tools such as a compressor running on a 240?
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Old 10-02-2011, 04:10 PM   #25
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okay i understand, but should I have my basic 120v tools such as a compressor running on a 240?
The advantage of using 240, if possible, is that you can feed the circuit with smaller wire. This can be significant for electric motors because of startup current requirements.
Some electric motors can have the internal wiring changed so then can be setup to work at either voltage. You cannot just plug a 120 volt motor into a 240 volt receptacle.
What size motor is on the compressor and does it say 120/240 on the name plate? If it is a portable, on wheels for instance, compressor then having it run at 240 may make it less portable. 120 receptacles are much more common than 240 receptacles.
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Old 10-02-2011, 04:24 PM   #26
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ohh okay, the idea that I got was i could run the compressor on a 240 current with a 120 receptical and it was better for the compressor and other future tools, its 1.6 horsepower
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Old 10-02-2011, 06:27 PM   #27
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120 tools will run on 240, at least until the smoke comes out.
Just try that with 120 volt tool on 415 volt system { basically the same idea with your 480 volt system } nice smoke show.

I have see that few time allready when someoen is not pay attetion to the power source hookup.

Merci.
Marc
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Old 10-02-2011, 07:32 PM   #28
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i thought that article said that 120 volts could run on 240 volts if you have the proper plug and that it be better for the power tools
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Old 10-02-2011, 07:57 PM   #29
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Not exactly. IF you can get a compressor that is dual-rated (120 or 240), then it will work better when configured for and connected to a 240 Volt source.

You can NOT plug a 120 Volt tool into a 240 Volt outlet, expecting it to work better. It will work, but only for a few seconds until the smoke pours out, burning up the equipment.
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Old 10-02-2011, 09:08 PM   #30
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I c guys thanks for the help the project is already underway

I bought 60 ft of 2-2-2-4 wire and the pvc pipe tomaro im going to get the load center you guys recommended for 73 dollars, they have it at my local lowes. they even took back the old load center I told you guys I already bought

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