Honeywell SLC - 4.4 NFPA Style 7 SLC with Isolators

28 FireLite SLC Wiring Manual — P/N 51309:P4 9/17/2014
SLC Circuits with Isolators NFPA Style 7 SLC Using Isolator Modules
4.4 NFPA Style 7 SLC Using Isolator Modules
Style 7 operation requires using isolator modules (or a combination of isolator modules and isolator
bases) before and after each device. Flanking each device with an isolator provides fault protection
to all other devices on the loop.
• T-tapping is NOT allowed within the Style 7 wiring configuration.
• When a detector base or pull station is used, install isolator modules on both sides of the
device.
• Connections between isolator modules and the device they isolate must be “close-nippled”
conduit, within 3 feet (91.44 cm).
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SLC-style7iiso.wmf
SLC Out
SLC Return
Two-Wire
Addressable
Detector
Addressable
Pull Station
Control Panel
Two-wire
Addressable
Detector
Figure 4.6 NFPA Style 7 SLC Using Isolator Modules
Isolator
Module
Isolator
Module
Isolator
Module
Isolator
Module
Isolator
Module
Isolator
Module
Isolator
Module
Isolator
Module