Code reference to support substitution of copperweld for copper

[SWfangirl]

I work on collection system design for wind farms. I am looking for a code reference that supports the use of either bare 7#6 awg or bare 7#8 awg copperweld instead of bare stranded copper for the ground wire in a trench. I have the cost savings already but would like more to present to the owners of the projects.

 

[jghrist]

What code specifies the bare stranded copper size?

 

[dpc]

It might help if you could take the time to tell us what code you are talking about.

David Castor

http://www.cvoes.com

 

[SWfangirl]

Let me try again.

When sizing grounding electrode conductors per NEC table 250.66 I find the size such as 1/0 awg or 2/0 awg ect. This table also shows conductor material such as copper, aluminum, or copper-clad aluminum.

I have noticed in the industry that Copperweld (copper-clad steel which is not referenced in this table) is being used as a substitue for copper, aluminum, or copper-clad aluminum.

I am wondering if there is a code reference stating that Copperweld can be used for the grounding electrode conductor as a substitute for copper, aluminum, or copper-clad aluminum. I am not even sure there is one.

Does this make more sense?
If so can some one point me in the right direction to look for information I would really appreciate it.

 

[dpc]

I do not think Copperweld is allowed by NEC for use as a grounding conductor. Copper clad steel ground rods are allowed.

Electric utilities are exempt from the NEC so they do use it, although I don't know of any who actually use it for in-ground grounding conductors. The manufacturers have been promoting its use with utilities to deter copper theft.

Copperweld was commonly used as an overhead conductor for lightly loaded circuits, but that is not done much on new lines.




David Castor

http://www.cvoes.com

 

[SWfangirl]

Thanks dpc. At least I am not overlooking something.

 

[jghrist]

NEC 250.62 says that the grounding electrode conductor shall be of copper, aluminum, or copper-clad aluminum.

I know of utilities that use copperweld as transmission line counterpoise and as substation ground grid conductors. It is harder to steal and worth less to thieves.

 

[cuky2000]

The IEEE Std 80 list the copper-clad (refer to Ch 11) as a suitable grounding conductor provided that the integrity of the underground network and the fusing current will be maintained for the useful service life of the facility.

A further analysis of the soil conditions should be evaluated to determine if there is not an aggressive corrosive media that impacted the ground grid.

Notice that Copperweld is a brand name of the generic copper cladding process. I believe this company was recently sold to a Chinese corporation, Fushi International.

I hope this help.