I love when I've lived somewhere for a while and come across something that I can't identify.

Could someone tell me what is attached to this light fixture in my furnace room? It's some sort of low gauge wire coming in from one side of the room, going into this block attached to the fixture, and then running out the other side of the room. It's clearly not the power for the light (that would be the white romex coming in from the left). It almost looks like ethernet, but it's certainly not that. I would google it, but I can't think of what to search for.

Anyone know?


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Matt