Quote:
Originally Posted by mesquaukee  ... it's house wire in the picture. In Ontario it's called NMD-7 wire. The ground is a bare wire that is attached to the ground screw on the box. |
Right.
A single-pole switch has two brass screw terminals. Both are hot leads for one incoming and one outgoing line (black). Those are all the wires that connect to the switch.
The neutral wires (white) tie together separately and the ground wires tie together separately in the box.
Many new switches include a (green) ground screw; others may not have one. If you have the choice, get a switch with a ground screw terminal. That's where the bare copper or green wire connects (& box gnd).
I can't see a (bare) ground wire in the first picture I posted.