grounding E C sizing

[Stevenfyeager]

Out of habit, I have always used #6 Cu for all GECs. Even for all those100 amp subpanels. According to 250.66, I could have been using #8, correct ?

 

[infinity]

Yes #8 is permitted typically for 100 amp services. One caveat is that it cannot be run exposed, it needs to be either in raceway or cable armor.

 

[Stevenfyeager]

Yes #8 is permitted typically for 100 amp services. One caveat is that it cannot be run exposed, it needs to be either in raceway or cable armor.

Thanks, not the biggest mistake I've made, its just a little cheaper and easier to run than #6. But I see the code you are talking about.
250.64 B (3) Does this mean it has to be in conduit even inside a drywalled wall ?

 

[texie]

Thanks, not the biggest mistake I've made, its just a little cheaper and easier to run than #6. But I see the code you are talking about.
250.64 B (3) Does this mean it has to be in conduit even inside a drywalled wall ?

Yes. Must be protected by one of the means listed in (B)(3).

 

[jaggedben]

Since an 8 awg GEC needs protection they make 8/1 solid armored cable for people who want that.

SOUTHWIRE 55331101 8-1 SOL BARE COND W/ STL ARMOR | Gordon Electric Supply, Inc.

SOUTHWIRE 55331101 8-1 SOL BARE COND W/ STL ARMOR

www.gordonelectricsupply.com

However you need different electrode fittings that clamp the armor to bond it and by the time you're done with all that I think it's cheaper to run 6awg

Also on a 200A service you generally need 4awg because of the service conductor size.

 

[infinity]

Thanks, not the biggest mistake I've made, its just a little cheaper and easier to run than #6. But I see the code you are talking about.
250.64 B (3) Does this mean it has to be in conduit even inside a drywalled wall ?

Running #6 is easier and in the long run cheaper than running #8 cable armor. For #8 GEC's to a water pipe you can use #6 aluminum instead of copper without protection.

 

[Stevenfyeager]

Running #6 is easier and in the long run cheaper than running #8 cable armor. For #8 GEC's to a water pipe you can use #6 aluminum instead of copper without protection.

Thanks. #6 AL would probably not work unprotected underground to a rod ?