The area near my electrical box is paved in
with concrete. I acquired a 3/4" star drill
and hand drilling hammer, and drilled
through approximately 4" of concrete over the
next few weeks. The bit dropped a few
inches, and I figured that I hit earth. I
then attempted to drive the grounding rod.
A few inches down, it hit an impenetrable
obstruction. The tip (steel) became blunted.
This was almost a foot down, and I went to
work with the star drill again. The barrier
seems to be impenetrable. What should I do?
Use a larger star drill to make a stepped
hole? Request someone to weld an extension
to the drill? Use a carbide tipped or
By the way, service entry is overhead. This
may or may not be applicable.