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Topic by TomFran posted 11-03-2010 08:46 PM 4176 views 0 times favorited 8 replies Add to Favorites Watch
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TomFran

6 posts in 3669 days

11-03-2010 08:46 PM

My son has purchased a Generac 17kw generator. He has placed it approximately 200’ away from his main electrical panel.

My question is, what size wire do I need to make the run from the generator back to the transfer panel to carry the load?

I guess I would prefer to use direct burial aluminum cable, since copper prices are through the roof these days.

Any help would be greatly appreciated.

-- Tom , SC



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PaBull

701 posts in 3769 days

11-12-2010 01:14 AM

I am not an electrician, but I posted the question on LJ. http://lumberjocks.com/topics/22005

There is more traffic on LJ.

Be well, Pb.

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Dan Lyke

331 posts in 3822 days

11-12-2010 02:33 AM

I am not an electrician.

My off-the-cuff calculation says that 17kW is roughly 150 Amps. The Taunton Code Check Complete book (two years old edition), says that per NEC T250.122 table if that had a 100 amp breaker on it you’d need #8 copper EGC or #6 aluminum EGC.

My stupid wild-assed guess based on a few online resources is that 200A would need #6 copper or #4 aluminum, but at 200 feet you should probably also do the voltage drop calculations and oversize that. Coated #6 copper appears to be 0.510 Ohms per thousand feet, #4 aluminum is 0.508 Ohms per thousand feet.

But if you don’t remember how impedance works (I go about as far as Ohm’s law and stop, so if it gets beyond DC), you may want to use something like this voltage drop calculator (and 200 feet is half your circuit length), and take some rough guesses at how low you’re willing to go with voltage at the far end.

-- Dan Lyke, Petaluma California, http://www.flutterby.net/

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TomFran

6 posts in 3669 days

11-12-2010 04:00 AM

Dan,

Thanks for the info! I checked that calculato,r and I believe that will give me what I need.

-- Tom , SC

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TomFran

6 posts in 3669 days

11-12-2010 04:00 AM

PaBull,

Thanks! I appreciate your help.

-- Tom , SC

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PaBull

701 posts in 3769 days

11-12-2010 06:13 PM

Any time Tom, good luck with your project.

I like your scripture reference to Romans 8:28. Spreading the WORD!

Be well, Pb.

View lilredweldingrod's profile

lilredweldingrod

11 posts in 3089 days

11-15-2010 12:34 AM

Hey Tom, You can always slip over to LJ and check with Topamax. He always has the straight dope on electrical. Rand

-- Yesterday I could not spell welder; Today I are one.

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TomFran

6 posts in 3669 days

11-15-2010 01:59 AM

Rand,

Thanks a lot, my friend for your recommendation. Actually, I already did consult him, and I believe I have the information I need at this point. Thanks to all you fellows for your help and advice! We have a great community of people here on these sites!

-- Tom , SC

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archash

32 posts in 49 days

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