How should I connect bare copper ground wire from a new light fixture to a plastic junction box?

Question

It’s an early 1900s house but the electrical was probably updated over a decade or so ago. I have a new light fixture which states to wrap the bare copper ground wire around the green ground screw on the included cross bar which then connects to the copper ground wire from the outlet box.

The outlet box is plastic and the bare copper wire from the outlet box is wrapped around what appears to be a grounding screw (See picture. Box has bare copper wire, white wire, and black wire).

So how do I connect the two copper wires given this? Do I leave the copper wire from the outlet box on the outlet box’s grounded screw, and ALSO ground the copper wire from the fixture to the ground screw on the included cross bar? And THEN connect the two copper wires?

Answer 1

I would use a wire nut or a WAGO to connect the two grounds together.

That ground screw might not hold two wires together enough--one might come off.