Wire size for a 500' run

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480sparky

Senior Member
Location
Iowegia
Copper or aluminum?

Voltage & phase?

Overhead (open air), direct burial, or in a raceway?

Any ambient temp issues?

How many conductors?
 

charlie b

Moderator
Staff member
Location
Seattle, WA
Occupation
Electrical Engineer
I would agree with the 1/0 copper, presuming that the "2p" was intended to mean "single phase, two pole."
 

yired29

Senior Member
I would use 2/0, this would ensure max 3% voltage drop. I assumed you were using copper.

I also get 2/0

CM = 2 x K x I x D / VD

CM = 2 x 12.9 x 60 x 500 / 7.2 = 107,500

1/0 = 105,600
2/0 = 133,100

This is assuming that it is actually a 60 amp load not just a 60 amp OCPD. If this is a 60 amp OCPD than the actual load would probably be less than 60 amps. More like 60 X .8 = 48 amp load.
 

gmtt

Member
Thanks guys. I found a voltage drop calcualtor in the web. Actually it is a 30A generator pushing power to the 49th flr. I am using 2 AWG copper with a drop of 2.9%. Thanks.
 

480sparky

Senior Member
Location
Iowegia
Thanks guys. I found a voltage drop calcualtor in the web. Actually it is a 30A generator pushing power to the 49th flr. I am using 2 AWG copper with a drop of 2.9%. Thanks.

If you're going up the building, wouldn't the voltage get higher as you go? :D
 

yired29

Senior Member
Thanks guys. I found a voltage drop calcualtor in the web. Actually it is a 30A generator pushing power to the 49th flr. I am using 2 AWG copper with a drop of 2.9%. Thanks.

Don't forget if you are using A EGC look at 250.122 (B).
 
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