Re: Can't Mix Smoke Models....really?

["mbbaker@xxxxxxxxx" <mbbaker@xxxxxxxxx>]

NFPA 72-2002 4.4.2 Compatibility. All fire detection devices that
receive their power from the initiating device circuit or signaling
line circuit of a fire alarm control unit shall be listed for use with
the control unit.

NFPA 72-2002 C.1 Directly connected system smoke detectors, commonly
referred to as two-wire detectors, should be listed as being
electrically and functionally compatible with the control unit and the
specific subunit or module to which they are connected. If the
detectors and the units or modules are not compatible, it is possible
that, during an alarm condition, the detector's visible indicator
will illuminate, but no change of state to the alarm condition will
occur at the control unit. Incompatibility can also prevent proper
system operation at extremes of operating voltage, temperature, and
other environmental conditions.

Happy holidays,

Mike

--
Michael B. Baker, SET
Michael Baker & Associates, Inc.
PO Box 737
Gladstone, OR 97027-0737
503-657-8888 v
503-655-1014 f
ET News(r) http://www.etnews.org