On Fri, May 8, 2015 at 9:15 AM, Sean Breheny wrote: > Ah, OK, thanks for the explanation. > > I don't think that method would work so well in the area where I had to > drive a few ground rods (northeastern Pennsylvania) because the soil was > very rocky, often with fairly large rocks. > > What did you end up doing? Did you use a jackhammer? I see they make ground rod driver adapters for some of the hammers, but ideally I'd like a cheaper option. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .