I'm sorry if this is an ignorant question, but it is one that I cannot seem to figure out. When I was changing a light bulb in my ceiling pot light fixture, the power switch was turned off, and I touched the base of the lighbulb (the metal part) as I was screwing it in. I got zapped. Just a short buzz, really.
I was always under the impression that no power would be supplied to a light fixture when the power switch is off. I use a multimeter, and surely enough, the base of the lightbulb is live even when the switch was off. I tried 2 other light fixtures in the house, one was similarly wired, whereas another was as I had originally expected, where there was no live portion of the socket when the wall switch was turned off.
Does this mean that the light fixtures in question are improperly wired up? Or am I not understanding the way the light switch works?
Thanks in advance for your help, and again sorry for the noob question.