16
• A maximum of 24 Kidde Safety devices may be interconnected in a multiple station
arrangement. The interconnect system should not exceed the NFPA interconnect limit of
12 smoke alarms and/or 18 alarms total (smoke, CO, Smoke/ CO Combination, heat, etc.).
With 18 alarms interconnected, it is still possible to interconnect up to a total of 6 remote
signaling devices and / or relay modules.
• The maximum wire run distance between the first and last
unit in an interconnected system is 305 m (1000 ft).
• Figure 9-A illustrates interconnection wiring. Improper
connection will result in damage to the alarm, failure to
operate, or a shock hazard.
• Make certain alarms are wired to a continuous (non-
switched) power line.
Existing Kidde
AC Connector
(either connector
can be used for
this model)
AC connector
shipped with
product
AC connector
Additional
Alarm
REDBLACK
WHITE
Additional
Alarm
BLACK
WHITE
REDBLACK
WHITE
Kidde Relay Module
SM120X, CO120X
or both
Optional
Accessory
First
Alarm
Figure 9-A, Interconnect Wiring Diagram
Wires on alarm harness: Connected to:
Black: Hot side of AC line
White: Neutral side of AC line
Red: Interconnect lines (red wires) of other
units in the multiple station set-up
Figure 9-B
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