D450-09-00
2
I56-451-02
Mounting
This detector base mounts directly to 3-1/2-inch and 4-inch
octagon boxes, and 4-inch square boxes (with or without
plaster rings). To mount, remove the decorative ring by
turning it in either direction to unhook the snaps, then
separate the ring from the base.
Install the base to the box using the screws supplied with
the junction box and the appropriate mounting slots in the
base (see Figure 1). Place decorative ring onto base, then
turn in either direction until the ring snaps in place.
Installation Guidelines
All wiring must be installed in compliance with the Na-
tional Electrical Code and the local codes having jurisdic-
tion. Proper wire gauges should be used. The conductors
used to connect smoke detectors to control panels and ac-
cessory devices should be color-coded to reduce the likeli-
hood of wiring errors. Improper connections can prevent a
system from responding properly in the event of a fire.
For signal wiring (the wiring between interconnected de-
tectors), it is recommended that the wire be no smaller
than 18 gauge (1.0 square mm). Wire sizes up to 12 gauge
wire (2.5 square mm) may be used with the base. For best
system performance, the power (+) and (–) loop wires
should be twisted pair and installed in separate grounded
conduit to protect the loop from extraneous electrical inter-
ference.
Smoke detectors and alarm system control panels have
specifications for allowable loop resistance. Consult the
control panel manufacturer’s specifications for the total
loop resistance allowed for the particular model control
panel being used before wiring the detector loops.
Locate installations where the normal ambient tempera-
tures do not exceed 100
°
F.
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
SHORTING
SPRING
Figure 1. Mounting base to box:
A78-1175-01
