I was removing some wall plates and noticed that behind a blank wall plate I had the mess of wires as shown. It looks like it's a white wire with a red and yellow wire inside. I used a contact tester on the red and it was indicating voltage, although I have read those are notorious for false positives. My question is if I should cap the white wire with a wire nut. If I do, would there be any issue with the red and yellow being twisted together?
Best Answer
This looks like telephone or doorbell cable. It can safely be left alone.
This is allowed to be in an orange backless junction box. It appears in this case they used a blue box rated for mains power and cut the back off of it.