In article ,
Robert11 wrote:
Hello:

About to buy a few Kidde P12000 Smoke alarms.
The AC wired type, with both ionization and photocell.

Looked at their on-line instructions, and was surprised
to see that they say to install on circuits that are NOT
GFCI protected.

Seems surprising.

Anyone know the reason why ?

Thanks,
Bob
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" Make certain all alarms are wired to a single, continuous (non-switched)
power
line, which is not protected by a ground fault interrupter. "


When the fire melts the wire insulation and ground faults before the
smoke reaches the alarm they want the alarm to still have a chance to
go off

--

Larry Wasserman Baltimore, Maryland