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Old 06-24-2009, 11:00 AM   #1
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underground wiring


Hello, I need to run a #2 awg 3conductor wire from a 200 amp sub-panel to a 75 amp panel the distance is 600 ft. and the wire will be buried in conduit. First of all is the #2 wire big enough and if so where can I purchase 600 ft. all I can find so far is 500 ft. rolls. Thanks

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Old 06-24-2009, 11:11 AM   #2
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underground wiring


Are you looking at #2 Cu or Al?

For #2 Cu, you'd have a 7% voltage drop @ 600ft @ 240V @ 75A. If you're planning on drawing at or near 75A you'll need larger wire.

I'm getting 4/0 Cu for a <3% drop at 240V/75A and 600ft, but that's on an internet calculator, so hopefully someone will check my numbers.

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Old 06-24-2009, 11:27 AM   #3
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Where can a 4/0 wire be purchased?
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Old 06-24-2009, 01:47 PM   #4
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underground wiring


Not sure where the wire can be purchased in your area specifically, but you should check out electrical supply houses. You can probably get custom lengths online, but shipping will be high.

I saw you opened up another thread about 4/0.. You should wait until someone confirms what I said about sizing the wire before you buy it based on my advice.

Also, I should have said earlier that Al wire will be much less expensive for that run, even though you would need a larger size.

This is the calculator I was using, BTW:

http://www.southwire.com/voltagedropcalculator.jsp
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Old 06-24-2009, 02:38 PM   #5
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underground wiring


No need for 2 threads about the same thing
Here's the other thread:

#4/0 awg wiring
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Old 06-24-2009, 03:04 PM   #6
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underground wiring


Sorry, I'm new to the site and I'm still learning, I will delete one if I figure it out. Thanks
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Old 06-24-2009, 06:46 PM   #7
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underground wiring


Quote:
Originally Posted by oldman56 View Post
Where can a 4/0 wire be purchased?
Try here.

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