250.53 (G) Last sentence. The upper end of the electrode shall be flush with or below ground level unless the aboveground end and the GEC attachment are are protected against physical damage. BTW, I would have the conductor on the other side of the rod, with the set screw biting into the rod itself.
Re: Ground Rod Installation#103463 08/09/0206:26 PM08/09/0206:26 PM
I believe that the "acorn" clamp is used incorrectly. As Redsy said, the method we have always used is the rod is between the setscrew and the conductor. In the manner it's installed, physical damage will be inflicted on the conductor.
Also. the rod must be flush or below grade, or protected from physical damage.
Re: Ground Rod Installation#103464 08/09/0207:25 PM08/09/0207:25 PM
That 'groove' is there so an inspector can tell if the entire rod is driven into the ground. Pulling these things out after hitting ledge or a stone is not a fun or productive thing to do. (Why does it happen at 6 1/2 feet?)
Wondering what are some techniques some of you guys use for driving them in or pulling them out?
Re: Ground Rod Installation#103467 08/11/0202:25 PM08/11/0202:25 PM
I use a rotary hammer with rod attachment. Best money I ever spent. When I have to do it by hand I use a "monster maul". It's an over sized wood splitting maul that has a 32" hollow pipe handle and a 16 pound head. Just slide handle over rod and go.
Re: Ground Rod Installation#103469 08/13/0205:06 AM08/13/0205:06 AM
We put in 18 one day at a mobile home park we set up. Put 17 of them in with the front endloader bucket on a 40hp Kabota tractor. Start them in a hole with a shovel and let the bucket down. One hit a rock and doubled back and came back out about two and half feet above grade. We replaced it with a new one drove with a Milwaukee demo hammer and ground rod attachment.
Lighting the way
Re: Ground Rod Installation#103470 08/13/0209:42 PM08/13/0209:42 PM
I have found radically different soil conditions within ten miles...from mean hardpan to one that just about was lost in “quicksand”-like conditions. I’ll side with sparky the ¾-inch GRC is just right for ¾-inch rods. A ±3x18-inch shaft scrap can be welded to a ¾x6-inch GRC nipple, and three more nipples strung together with couplings. After reaching ~2-foot rod exposure, depending on elbow room, remove the nipples one at a time, or, reversing the driver and use the GRC attachment as a handle to limit stoop labor.