In examining several dozen electrical panels over the last few years, I have seen almost as many ways the grounding conductors are run from the ground rod and/or water lines. In some installations, the ground is run as a solid cable, in others, it is run as a stranded cable. Some of the older installations have a ground cable inside a steel(?) armored cable. I have even seen #6 green THHN used. Then there is the way these cables are clamped to joists or other wooden structures. In some installations, the wire is attached with small metal staples or fold-over metal straps, in others, common romex staples are used, and in a few places, bent nails are used! There also does not seem to be a standard entry method into the circuit panel itself. Some installations use a 1/2 inch knockout with or without a cable clamp. Some installations use a smaller knockout, about 1/4 to 3/8 inch in diameter.
My question is what is the prefered method to run a ground?
1. Prefered wire type -- When should stranded be used instead of solid?
2. Attachment method to wooden structures.
3. Method of entry into the panel.
Thanks!
My question is what is the prefered method to run a ground?
1. Prefered wire type -- When should stranded be used instead of solid?
2. Attachment method to wooden structures.
3. Method of entry into the panel.
Thanks!