William, the importance of a smoke detector is that it be functioning 24-7.
If it were installed on a dedicated circuit from any panel, it could
inadvertently be turned off. If it were installed on any general lighting
circuit, most likely you would know if it were turned off by the other
things that went off with it
" wrote in message
oups.com...
Greetings,

Is there any rule which states not to run 120V wired smoke alarms from
a subpanel? I could see someone saying that the breaker to the
subpanel might flip leaving the smoke alarms with no AC power. Is this
a real concern addressed within the NEC or fire codes? Or can I just
run it off the subpanel and forget it because code doesn't address the
issue?

Thank you for your time and energy,
William