Correct wire size for second panel?

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  #1  
Old 04-28-16, 10:25 AM
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Correct wire size for second panel?

I have a service drop from the transformer to my meter main 20' away. The main is a 400amp service (320amp-residential) I come out of that main and go underground using 750mcm Aluminum which runs less than a 1000' to a pull box. In that pull box I tapped into the aluminum using 2/0 copper wire and ran another 50' into a 200amp panel in my home. I want to run new wire to a new location.

My question
I want to tap into the same pull box (750mcm) and make a new run 290' away to another 200amp panel at my shop.
1. What size copper wire can I get away with??? or Aluminum???
2. What type of connectors will I need to tap the 750mcm
3. What size schedule 40 pvc conduit will I need?

Thanks for any help! Much appreciated!
 

Last edited by beg4forgiveness; 04-28-16 at 12:32 PM.
  #2  
Old 04-28-16, 01:17 PM
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I'm already calculating a ~5% voltage drop on the 1000' run with just the one 200A service -- I don't see a lot of room to add another.

What is the feeder breakered at on the panel at the pole? Is this a three-wire or four-wire feeder?

What are your actual/calculated loads in each building?
 
  #3  
Old 04-28-16, 06:23 PM
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it's two 200amp breakers. It's a four wire feeder.

Actual calculated loads in each building are - 100amps and 60amps
 
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Old 04-29-16, 12:49 PM
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it's two 200amp breakers. It's a four wire feeder.
I cannot think of a single way to terminate 2 - 750 MCM hot conductors to two 200 amp breakers. Can you provide a picture of the terminations. Sounds like you have a mess.
 
 

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