OK, so I was looking in a box today because I thought I heard a noise. There are two light switches and one receptacle on this box. The one light switch has a red wire fastened on a screw at the top and a black wire fastened to the screw at the bottom. The other light switch is the same however there are two black wires on the bottom screw.
There is no evidence that I can see of any arcing, burning or melting in the box. I am not even sure if the noise I heard, a clicking noise, was from the box (but it was in that vicinity)- anyway my question is: are there any issue with having two wires on one screw on the light switch?
I know nothing about this stuff so I just look at it, never touch it or take it apart- I learned that lesson the hard way a while back.