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• A maximum of 24 Kidde Safety devices may be interconnect-
ed in a multiple station arrangement. The interconnect sys-
tem should not exceed the NFPA interconnect limit of 12
smoke alarms and/or 18 alarms total (smoke, CO, Smoke/
CO Combination, heat, etc.). This Smoke/CO combination
alarm must be counted as a smoke alarm when determining
the number of units on an interconnect line. With 18 alarms
interconnected, it is still possible to interconnect up to a total
of 6 remote signaling devices and /or relay modules (see
page 16 for details on interconnecting Kidde devices).
• The maximum wire run distance between the first and last
unit in an interconnected system is 1000 feet.
• Figure 3 illustrates interconnection wiring. Improper connec-
tion 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. NOTE: Use standard UL Listed household wire
(as required by local codes) available at all electrical supply
stores and most hardware stores.
Installation Instructions
12
FUSE OR CIRCUIT BREAKER
REDBLACK
WHITE
CONNECTOR
REDBLACK
WHITE
CONNECTOR
First
Alarm
Additional
Alarm
Kidde
Relay Module
SM120X
Additional
Alarm
Optional
Accessory
A
L
A
R
M
O
P
E
R
A
T
E
A
L
A
R
M
O
P
E
R
A
T
E
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 3 Interconnect Wiring Diagram