Open switch panel and disconnect one switch. Wait a day. If no one complains, disconnect the second. Wait a day. If no one complains, it’s probably the third. For good measure, disconnect the third switch. If still no one complains, remove all switches and the lightbulb, since they’re not needed anymore. (The Sysadmin approach)
I used this method a few months ago in my breaker box. I needed to make room in it for an EV charger.
I used this method a few months ago in my breaker box. I needed to make room in it for an EV charger.