SilentKnight 5808 - Manual (Page 64)

IntelliKnight 5808 Installation Manual 151274-L8
5-3
5.4.1 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 760-51 requirements for power limited fire protective signaling
cables. Wire distances are computed using copper wire.
Maximum wiring resistance is 40 ohms for SK device and 50 ohms for SD devices.
Maximum loop length depends on the wire gauge. See Table 5-1 and Table 5-2.
Table 5-1 Maximum wiring distance for SK Modules
Table 5-2 Maximum wiring distance for SD Devices
Figure 5-1 and Figure 5-2 show how wire length is determined for out-and-back tap and T-tap style wiring.
Figure 5-1 Calculating wire run length for a simple out and back tap
When using T-taps, the total length of all taps and the main bus must not exceed 40,000 feet. This requirement
Wire Gauge Max. Distance for SK
22 AWG 1200 feet
18 AWG 3100 feet
16 AWG 4900 feet
14 AWG 7900 feet
12 AWG 10,000 feet
Wire Gauge Max. Distance for SD
22 AWG 1500 feet
18 AWG 3900 feet
16 AWG 6200 feet
14 AWG 10,000 feet