I recently redid an upstairs room in my house and installed new three-prong outlets in each of the fixtures. Each of them has been grounded. Two of them are on one circuit and work fine. The third one appears to be wired to a wall switch.
The switch that was already installed is, according to the printing on it, is a three-way five-amp switch. Only two wires connect to this switch (black and white according to my home's wiring code; I'm in the USA). When I throw this switch, one of the circuit breakers downstairs trips and lights in an adjoining room turn off. I was worried that the switch might be wired in backwards, but that doesn't seem to have any effect.
Nothing is plugged into any of the outlets in this room. Is there something obviously wrong here?
Replies in email as I don't check this group often.