I was changing a light bulb in a ceiling light fixture. I unscrewed the nut and removed the glass cover. When I was replacing the bulb I noticed that there was a copper wire loosely coiled around the center rod (threaded at the bottom...that's where the nut goes for holding the glass cover)
I'm assuming that's the bare ground wire. Is that adequate grounding. Does the wire need to be attached via a screw clamp...similar to what you see in receptacles?
I saw this with a couple of other fixture bases around the house.
Here are pictures of two fixtures.
The one on the right looks like the wire is screwed in AND the remainder is coiled around the post.
The one on the left...don't know where that wire is coming from.
Is there an easy way to test for proper grounding? I know that for receptacles I can plug in a device to tell me.