System Sensor B401 - Manual (Page 2)

D450-08-00 2 I56-338-09R
A78-1468-01
Figure 1. Mounting base to box:
SHORTING
SPRING
Mounting
Figure 1 shows mechanical mounting details. These detec-
tor bases mount to typical junction boxes. Attach the base
to the box using the screws supplied with the junction box.
Installation Guidelines
All wiring must be installed in compliance with applicable
codes and the authority having jurisdiction. Proper wire
gauges should be used. 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
responding 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 18 gauge. Wire sizes up to 12 gauge may be used with
the base. For best system performance, the power (+) and
(–) loop wires should be twisted pair and installed in sep-
arate grounded conduit to protect the loop from extraneous
electrical interference.
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 control panel being used
before wiring the detector loops.
Wiring Instructions
Do not loop wire under terminals. Break wire run to ensure
supervision of connections.
Wire connections are made by stripping about 3 ⁄
8
" of insu-
lation 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.
Two-wire initiating devices receive their power from the
initiating circuit of a control panel. Electrical specifications
of the control panel and the detector-base combination
must be compatible for the system to function properly.
System Sensor maintains a list of two-wire detectors and
control panels that are listed as compatible. The 2-Wire
Compatibility Chart is available from System Sensor at no
charge.
The zone wiring of the detector bases should be checked
before the detector heads are installed. To make this possi-
ble, this base contains a special spring-type shorting
jumper (shown in Figure 1). After a detector base is prop-
CAUTION