I would remove the plate to see what is in there, this might be a mounting for a light or ceiling fan. If you find house (120 v) wiring, then next you will need to find the supply or switch. I was able to get our house plans from Sumter County, and one of the sheets had the electrical wiring on it. NOTE: low voltage was not shown on any of the sheets.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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