F400-21-00
2
I56-954-01R
MOUNTING
This detector base mounts directly to 3-1/2 inch and 4
inch octagon boxes, 4 inch square boxes (with or with-
out plaster rings) and single gang boxes. To mount, re-
move the decorative ring by turning it in either direction
to unhook the snaps, then separate the ring from the
base. Install the base on the box using the screws sup-
plied with the junction box and the appropriate mount-
ing slots in the base. Place the decorative ring on the
base and rotate it in either direction until it snaps into
place (see Figure 2).
INSTALLATION WIRING GUIDELINES
All wiring must be installed in compliance with all appli-
cable local codes and any special requirements of the
authority having jurisdiction, using the proper wire
size. The conductors used to connect smoke detectors
to control panels and accessory devices should be
color-coded to reduce the likelihood of wiring errors.
Improper connections can prevent a system from re-
sponding properly in the event of a fire.
For signal wiring (the wiring between interconnected
detectors), it is recommended that the wire be no
smaller than AWG 18. However, the screws and
clamping plate in the base can accommodate wire
sizes up to AWG 12. The use of twisted pair wiring or
shielded cable for the power (+ and –) loop is recom-
mended to minimize the effects of electrical interfer-
ence.
If shielded cable is used, the shield connection to and
from the detector must be continuous by using wire
nuts, crimping, or soldering, as appropriate for a reli-
able connection.
Make electrical connections by stripping about 3/8
" (10 mm) of insulation from the end of the wire (use strip gauge
molded in base), sliding the bare end of the wire under the clamping plate, and tightening the clamping plate screw. Do
not loop the wire under the clamping plate.
The zone wiring of the detector base should be checked before the detector heads are installed in them. The wiring
should be checked for continuity and polarity in the base, and dielectric tests should be performed.
The base includes a label for recording the zone, address, and type of detector being installed. This information is impor-
tant to set the address of the detector head that will later be plugged into the base and to verify the type required for that
location.
A78-1175-13
Figure 2. Mounting Detector to Box
SNAP ON
DECORATIVE
RING
SCREWS (NOT
SUPPLIED)
DETECTOR
BASE
BOX (NOT
SUPPLIED)
