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Old 01-25-2015, 08:00 PM   #21
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not to mention the additional terminations and installation time of 2 more transformers...
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Old 01-25-2015, 08:09 PM   #22
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4160
4160 for??
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Old 01-25-2015, 09:32 PM   #23
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The voltage drop was already calcd out and 750 kcm was the result for that long a run. Looking at some of the answers you've all been kind enough to give me provided me with the answer and I thank you all for that. It also gave me lots of new ideas. I had already thought of stepping up to 4,169 v but I don't have the license for that and don't have the time to look for a contractor that does. Aluminum was another thought but again the bulk and tinsel strength of the conductor are a problem in My mind. Thanks for all of your comments. They very enlightening. :smiley:. Oh the answer is 300 kcm, two sets and it reduced the price by $13,000
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Old 01-25-2015, 10:16 PM   #24
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I don't see the advantage of bumping a 480v feeder to what, 600v? That isn't much gain. Installing transformers that burn Kw's all day long as well as extra disconnects/OCPD's make this less than ideal in the long run.

I'd pull aluminum and be done with it.
Who said anything about 600 volts?
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Old 01-25-2015, 11:55 PM   #25
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The bump was from 208 to 480
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Old 01-26-2015, 07:06 AM   #26
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...Oh the answer is 300 kcm, two sets and it reduced the price by $13,000
That will have ~20% greater voltage drop than the proposed single 750 kcmil.
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Old 01-26-2015, 05:19 PM   #27
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Can I have some one help me be a little less ignorant? I need to use 4 750kcmil copper conductors to run 225 amps 1000' to a 480v panel 3 phase 4 wire. I want to reduce the cost by using smaller wires in parallel. What formula can I use to calc the wire size. Or does anyone know this off of the top of their head?
I am missing something, I seen this thread last night, but was too tired to care. Then just before bed I seen the original poster post the answer.

What I am not understanding is, 225 amps 1000 feet to a 480v panel 3 phase 4 wire.

Help please?

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Old 01-26-2015, 05:26 PM   #28
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I am missing something, I seen this thread last night, but was too tired to care. Then just before bed I seen the original poster post the answer.

What I am not understanding is, 225 amps 1000 feet to a 480v panel 3 phase 4 wire.

Help please?

Borgi
He needs to run a wire to a 225 amp 480V 3 phase panel 1000 feet away. I assume he is pulling an equipment grounding conductor but he did not mention it.
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Old 01-26-2015, 09:00 PM   #29
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Originally Posted by Borgi View Post
I am missing something, I seen this thread last night, but was too tired to care. Then just before bed I seen the original poster post the answer.

What I am not understanding is, 225 amps 1000 feet to a 480v panel 3 phase 4 wire.

Help please?

Borgi

I am guessing at a pf of 0.8, and a 750 mcm would give a vdrop of about 2.94%. Parallel 250s would be around 2.79% and three runs of 2/0 would be around 2.95%... If PVC conduit is used it would be slightly less than that..
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Old 01-26-2015, 09:16 PM   #30
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I would step the voltage up on the feed end and reduce it down on the other end. Two small transformers will save you alot of copper.
I was thinking 600 volts and aluminum but the OP might be dealing with specs that call for copper.
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Old 01-26-2015, 09:28 PM   #31
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He needs to run a wire to a 225 amp 480V 3 phase panel 1000 feet away. I assume he is pulling an equipment grounding conductor but he did not mention it.
I was puzzled by that, but I understand the NEC calculates the size of the ground differently. The CEC has made changes in recent years in that regard.

What puzzled me is the lack of detail when posting the question, I incorrectly inferred the original poster wasn't aware that he could divide the amps in half first, then calculate parallel conductor sizes.

No matter, he obviously knew how to do it!

Borgi
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