sizing GEC for dual conductors

[Steviechia2]

I have 2 sets of 750 mcm conductors and am trying to figure my egc sizing. I'm on table 8 and I forgot which column I have to look at. I believe it's the stranding, diameter column? this would put me with a 3/0 copper conductor

 

[bluesmoke...oops]

Copper or aluminum?

You could try using:

http://www.electrician2.com/calculators/wireocpd_ver_1_parallel.htm

 

[augie47]

In this case you don't need Table 8 as you have kcmil sizes already.
(2) 750 kcmil = 1,500 kcmil. From 250.66, that's over 1000 so it's a 3/0 cu or 250 al for your GEC.
Be cautious however, for a bonding jumper {250.24(B)}you need to keep the 12-1/2 % rule in mind

 

[Dennis Alwon]

Nevermind-- I see the title is GEC and the post is egc-- I suspect he wants gec.

 

[Steviechia2]

Thanks