I'm having trouble figuring out why my light switch box is wired the way it is. The place I'm living in is quite old (guessing built in the 80s?). Originally, I opened open the panel with the hope of installing a switch-outlet combo… which I can't do until I figure out why it's currently wired the way it is.
I've made a diagram (below). The large rectangles on the edges of the box are the ROMEX cables, while the smaller squares are wire nuts. W = white wire (neutral), B = black wire (hot), Gnd = bare copper (ground). The switch is on the far right of the diagram.
As you can see, the wiring is quite strange. Two of the neutrals are connected to ground, with another neutral connected to a couple of the hot wires. If I had to guess, it looks like they wanted to make another power line without having to run separate cabling.
Can anyone tell what's going on here?
Thanks for the help!