I'm trying to put a new fan in my bedroom where previously there was only a light-fixture. When I take off the light fixture, the light is connected to a brown wire (instead of black) and two white wires twisted together. There is no evident ground wire.
As I start looking closer, I see a bit of electrical tape. So I take the tape off. It appears to be 3 thick copper wires (I assume my missing ground wires) crimped together and cutoff just below the crimp. The electrical tape was covering the 'nub' that this crimping created.
My question is, how can I attach the fan's grounding wire to this setup? Can I just wrap the wire around one of the copper wires and wrap the thing in electrical tape?
Edit: Added Image: