Wiring a Signaling Line Circuit (SLC) Installation
IQ-301 PN 50036:F 10/29/2001 49
Style 7 Wiring Overview
Figure 29 shows typical wiring of a four-wire SLC that meet NFPA Style 7
requirements. As shown in Figure 29, flanking each SLC device with a pair of ISO-X
isolator modules protects each device from short circuit faults that may occur on other
SLC devices. For example, a fault on zone 2 will not affect zones 1 and 3. ISO-X
modules on either side of zone 2 will open the SLC. Zone 1 will still operate from
power on loop out and zone 3 will operate from SLC return. Because the control panel
cannot communicate with zone 2, a trouble signal(s) will be generated for that device.
Note: Do not T-Tap or branch a Style 7 four-wire SLC. Ratings and characteristics are
identical to a NFPA Style 6 four-wire SLC.
Figure 29 Four-wire SLC (Style 7)
2.9.9 Wiring an Isolator Module (ISO-X)
ISO-X Module Overview
You can connect a maximum of 25 devices between isolator modules. During a fault
condition, the control panel registers a trouble condition for each addressable device
which is isolated on the SLC segment or branch.
Refer to 2.9.6 “Setting an SLC Address for a Module” for instructions on addressing
the modules.
TB6
1 2 3 4 5 6
A B B+ A+ B- A-
Detector in
Isolator Base 1
Detector in
Isolator Base 2
Addressable Manual
Pull Station (flanked by
ISO-X modules)
Note: All wiring between
a manual pull station
and ISO-X modules
should be enclosed in
conduit.
Note: If a non ISO base
is used, install ISO-X
modules on both sides
of devices within 20 feet
(6.096 m) of rigid
conduit.
Detector in
Isolator Base 4
SLC out
SLC return
Detector in
Isolator Base 3
Note: Locate ISO-X
module near detector.
Enclose wiring between
detector and ISO-X in
conduit.
AFP200-SLC-7.cdr
CPU
Connect SLC Out to
TB 6-3 (+) and TB 6-5 (–).
Connect SLC Return to
TB 6-4 (+) and TB 6-6 (–).
ISO-X
ISO-X
ISO-X
ISO-X
ISO-X
1
4
32
1
43
2
3
2
14
41
32
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