My house was destroyed by Hurricane Irma and I had to gut the interior. I found an area where, I am assuming the previous owner repaired as I cannot in my wilde

My house was destroyed by Hurricane Irma and I had to gut the interior. I found an area where, I am assuming the previous owner repaired as I cannot in my wildest dreams imagine a licenced electrician would do it, anyway the area, was an area where the romex did not reach the other side of the romex, so the person took speaker wire twisted them together, to be about the size of the romex wire and linked the two stands of romex They did not strip the plastic shielding from each strand of wire, just joined them at the ends. So I had 120 running thru basically a single strand of speaker wire.