Good grief, lots of answers here, eh?

24 gauge should do fine for a doorbell buzzer. It's
easily capable of 0.1A over a long run and is even
bigger than some of the supplied wiring on new bells
these days.

wrote in message
oups.com...
The system uses a 24V transformer. I am not sure of
the current draw.
I have extra 24 gauge wires available from an old
phone system and I'd
like to use them (I won't have to rip open any
walls.) I'm guessing 24
gauge is "probably" okay but not the best. (I can't
pull the old phone
wires and install a new 18 gauge (???) cable, there
are too many
staples along the path.)

What is the normal wire size for this situation?