I have a hardwired smoke detector that is old and outdated, that I'd like to switch with a new unit. The only problem is that I can't shut off the power to the alarm before I disconnect it and reconnect the new one. I'm going to have to do the take-down and installation while the power is LIVE.
I live in a high-rise apartment building and the smoke detector is powered not by my unit's individual power, but off of a line brought in from a common hallway. There is no way to cut power to the smoke detector without cutting power to all the lights in the common hallway, which is impossible.
So, how can I safely (or as safely as possible) change this detector with a new one? If I don't touch certain wires together, will I be OK? What are the chances I would get shocked?
I know your first inclination will be to tell me to get the circuit turned off or call an electrician, but please (at least hypothetically) assume that neither of those options are possible.
Thanks.