"Colbyt" wrote in message
m...

wrote in message
...
I have a hardwired smoke detector that is old and outdated, that I'd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.



I answer the questions without making judgments.

Hypothetically speaking, there is no way to get shocked or damage anything
if you work with one wire at a time and do not ground yourself while
touching the bare part of the hot (usually black or red) wire.

If I were to do something like this I would do the bare or green wire
first, the white wire second and the hot wire last. Once I had all the
wires connected to the new modular plug, I would plug it in and test it
before attached it to the box.

Note there may be an inter-connection wire (usually yellow that must also
be connected. This has no juice and can be done at any time.

Also the base plate may need to be changed even if it is the same brand.


--
Colbyt
Please come visit www.househomerepair.com



Hot comes off first goes on the last