I'm trying to install a ceiling lamp in Canada and the lamp box has 3 insulated wires sticking out of it: black, red and white. I'm getting 120V between black and white and between red and white. I'm getting 0V between black and red. There's also an uninsulated wire inside the box and I'm assuming that's the ground.
There's a switch on the wall that's controlling the red/white combo. There's nothing controlling the black/white combo as far as I can tell. What's going on here?
The switch and box have never been used before since the house was built.