User guide

Model MS-25 Installation and Operation Manual
5-2 53688
5.3 Wiring Requirements for SLC Devices
The following information applies to all SLC devices. Refer to the section that describes the
type of device you are installing for details.
5.3.1 Wiring SLC in Style 4 (Class B) Configuration
No special wire is required for addressable loops. The wire can be untwisted, unshielded, solid
or stranded as long as it meets the National Electric Code 760-121 requirements for power
limited fire protective signaling cables. Wire distances are computed using copper wire.
Maximum wiring resistance is 40 ohms to the farthest SLC device.
Maximum loop length depends on the wire gauge.
All SLC wiring is Supervised, and Power-limited.
Table 5-1 Maximum wiring distance for SLC devices
Wire Gauge
Max. Distance for SLC
devices
22 AWG 1200 feet
18 AWG 3100 feet
16 AWG 4900 feet
14 AWG 7900 feet
12 AWG 10,000 feet