In process of replacing light fixture. In the junction box everything looks pretty straight forward, except there is a heavier gauge (10 I think) wire (not part of fixture wiring) coming from the niche. Connected to it with wire nut in the junction box is 3 small gauge green wires (one each from switch/GFCI/fixture). I get the fixture out and the heavy gauge wire is just floating in the niche and not connected to anything, in fact it is snipped off flush with no bare wires. I do not have my new fixture yet so I haven't seen exactly how it hooks up. What do I do with this wire? Is it supposed to be connected to the niche or fixture?