said by jack b:There's always a chance the appliance electrical ground is either nonexistent, or at the very least if it's there, it's inadequate
There was no ground for the furnace when I bought the place, but the installer ran new romex to the panel. Same guys replaced the old fuse panel with a new one, and ran a #6 ground across the basement to the street side of the water meter. But they didn't bond the gas line