Posted by Stephen Newell on January 14, 2023 at 20:58:09 from (72.41.0.26):
In Reply to: electrical question posted by gbs on January 13, 2023 at 20:22:27:
Your neutral is grounded to the utility at the pole but you should also have a separate ground rod, sometimes 2 rods which is driven into the ground next to your house. Without seeing the box I would guess the green screw is for that separate ground. The ground rod is a copper plated steel rod about 8' long which has a 6 gauge bare copper wire bonded to it.
The sub-panel should have it's own earth ground and you keep the ground wiring separate than the neutral.
If you live in a place that is particularly dry the ground rod may fail to work. It needs to be into damp soil to be effective. Sometimes it takes a second rod in a different location to have a good ground. You would need a ground tester to insure the rod is making a good earth ground.
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