I need to cut off the old main electrical-panel ground wire clamp which is now attached even before the valve. Its currently in dirt, which is below the concrete slab level; the new installed valve itself will be surrounded by tile. The clamp on the pipe itself that comes up through the ground as well as the connection screw eye on that end of the twisted steel wire which completes the circuit (possibly if the water meter needs to be disconnected) have both corroded through and there is nothing to clamp to:to. I am not sure where I am going to place the new electrical ground clamp on the street side of the meter. Probably one that looks the same as the one on the other side. A (o)+ clamp with screws on either side to clamp the wire directly to the copper supply-line pipe, with a slot with screw to clamp the bare twisted wire into +. Its on copper pipe. the Horozontal pipe immediately downstream from the water meter. So I'll put one on the other, closet to the street side, of the water meter. This will be after the new valve, but the only other option is below the soon to be tiled floor!
I also want to fill the gap in the concrete slab (a 6" x 6" void with square edges right down into the dirt to China) so I can cut to fit a ceramic floor tile. Nobody will even put too much weight on it, but it is the last of any areas where the tiles will need to be installed right up to the edges of the floor. I won't thinset the screeding, just the outer parts of the tile leveled on the surrounding concrete slab. Hmm....a humped screeding.
These questions are all about dissimilar metals, water , and possibly electricity.:
Q1 Proposed location and probable steel material of a soon-to-be-purchased new electrical ground wire clamp attached directly to horizontal copper supply-line pipe after the (Vertically installed) new valve (embedded in tile w/ gap) but just before the water meter.[steel on copper]. There seems to be no problem with corrosion on the original/remaining location, but I am also changing the location, because of the tiling needed.
Q2 Spreading and leveling limestone screening into the dirt hole in the concrete slab, which will pour and pack loosely right up to the main water supply line (I think its copper, but lead it may be ). I think the very lowest extent of the new brass ball shut-off valve is gonna be slightly above the leveled screeding line, about half way up the height of the ceramic floor tile itself.