60 amp panel 1000'

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nickelec

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Need some input and some thoughts from the crew here I need to run a 60 amp sub panel from a three phase 120/208 panel about 1000 ft away I was thinking to possibly put a step up transformer at the current service to reduce the size of the wire needed and then step back down at the panel location any thoughts

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Depending on the nature of your load (lighting, motors, etc_) and the actual load, 4/0 or 250AL would likely be acceptable.
Transformers are a good method but at that load it might not be that economical.
 
For 1000 feet, definitely go for as high a voltage as you can. Just remember you'll be powering them both all the time.

Perhaps price it both ways. Is the load 3-phase, too, and what is the actual expected load current?
 
All this is for is a camera system really wa giving them the option to add inte future but all I need now is enough current to operate the system

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We have a similar deal. Truck scales. Maybe a small plug in power supply to operate the display lights. An LED area light. Seven hundred feet. I won't be taking less than 1/0 and would prefer to take 250s. The load will not get smaller and I can see heat in that little moveable garden shed they are planning. The little wood ones that look like small barns. It will keep getting bigger.
 
nickelec said:
All this is for is a camera system really wa giving them the option to add inte future but all I need now is enough current to operate the system

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Sounds like a lot of money to operate a camera. Will it work on 208 volts?
 
4/0AL will keep you under 5%vd at 50a. At this size and distance, stepping up to 480v isn't cost effective, the transformers would cost more than the 4/0AL. Around $2500 in wire running 4/0. A 30kva 480-208/120y is about $2000 itself.
 
Instead of solar and a battery, how about provision for a battery charger, battery and inverter. Plan for 5 amp total.
 
augie47 said:
Depending on the nature of your load (lighting, motors, etc_) and the actual load, 4/0 or 250AL would likely be acceptable.
Transformers are a good method but at that load it might not be that economical.
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4/0 AL phase - X= 0.041 R=0.10

2/0 AL ground- X= 0.043 R=0.16

1616785476088.png


Z= 0.0676 + 0.007056 squared

Z= 0.27 ohms

120/0.27= 444 amps

Going by this 444 amps is just a slight hair over 5 seconds:


Given wire will not be starting at 75*C during the fault, and the time current curve is based on max clearing vs max tripping I'd say 4/0-4/0-4/0-2/0 should have you fully covered as a minimum wire size.
 
And what do they want to do in the 40 x 60 foot building? Store old equipment with minimum lights, or have a grow house?
 
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