Copper-Aluminum GEC

at same grounding clamp. Is this dual rated?

I don’t know if the lug is rated for multiple conductors, but it appears you have tinned-copper rather than aluminum.

The grounding electrode must be installed in one continuous length without a splice or a joint, unless spliced by an irreversible compression-type connector listed for the purpose or by an exothermic welding process.

Thanks Michael, wanting to be sure this is not a connector I wasn’t familiar with.

Jeff you’re correct, it’s tinned-copper.

It’s a moot point. The IRC and NEC prohibit GEC splices:


Do you have a photo of this installation? You need to be careful when determining what’s actually a GEC and what’s a bonding jumper. Only the GEC is required to be continuous. You can use bonding jumpers to interconnect all of the electrodes that are part of the grounding electrode system. Here’s a few examples:

Starts with white cloth cable in photo 1.

Also a view of the mixture of panels.

Yes that’s a violation in photo #3. You have bare copper and tinned copper which is fine, however your splicing of the GEC is required to be irreversible. Also it is not permitted to use that lug in that fashion with two conductors. I see some other problems with the length of the SE cable to the panel on the left.

Thanks Robert, that was my original question. I deleted the photo. The service entrance and main panel installed in 1960.

With photo at left (main panel) where bare copper and tinned copper is under same lug, that’s also a violation, correct?

Yes, here’s the code references:

Thanks for the info.

They do have one that is designed for Linking the grounds and they have a separator between each GEC. Never payed attention to the company name on them. Do you know Robert Meier?
You find it in encased situations in concrete. I think it is called a Servit.

There are only two permissible types of products available to splice a GEC, one is an irreversible compression splice and the other is an exothermic welding (Cadweld) splice.

I believe that you’re referring to a split bolt that has a separator which would sit in between the two conductors. Those typically would be used when splicing aluminum and copper. That type wouldn’t be required here since the to conductors are both copper nor permitted due to the only types allowed as previously mentioned.

Correct. What is the name of the one I am refering to?
Electrical has always been my week spot in Home Inspection.
The reason is I seem to not be able to wrap my head around the confusion as the wire # system. I have talked to electricians and they can’t figure out why they did it this way either.:smiley:
Is there a reason?
One more point Robert don’t forget I am from Canada.

Yes, Servit is a brand name for a split bolt connector that is made by Burndy. Although they are permitted to be used for taps to the GEC they are not permitted to be used for splicing the GEC.


I know the name of that one. The one I am talking about has a separating shim in the middle that is used for two different size GEC’s
What is it called?
One is split bolt single wire. The other is two wire.
Same company but different name and application.:smiley:

You might be thinking about a Burndy “Tritap Servit” universal split bolt connector made for all combinations of copper and aluminum connections … that looks like this …

The American Wire Gauge (AWG) system has been used in the US and CAN since around 1857. This gauge system originated in the number of drawing operations used to produce a given gauge of wire. Very fine wire (for example, 30 gauge) requires more passes through the drawing dies to make it thinner than 0 gauge (1/0) wire. When larger wire was needed they went to 00 gauge (2/0), 000 gauge (3/0) and 0000 gauge (4/0) in increasing size. Above that is “kcmil” or thousands of circular mils, which relates to wire area.

Hope that helps … :wink:

RM … nice graphics to explain the differences. I always liked the Mike Holt figures, and his guide books with those diagrams are excellent … :wink:

Thanks Robert:

That is the one I was looking for.:smiley: