SilentKnight 5820XL - Manual (Page 73)

Model 5820XL / 5820XL-EVS Installation Manual LS10061-001SK-E
5-3
5.3 Maximum Number of Devices
The 5820XL/5820XL-EVS supports SK or SD devices on one system. The maximum number of devices per
system varies depending on device protocol and the number of 5815XL signaling circuit loop (SLC) expanders
added to the system. Device support is as follows:
• SK Devices–A system can support a total of 396 SK detectors and 396 SK modules. 99 devices can be
added to 5820XL/5820XL-EVS control panel. Each optional 5815XL adds another 99 detectors and 99
modules. Add up to three 5815XLs to 5820XL/5820XL-EVS system to achieve the maximum number of
devices on the system.
OR
• SD Devices–5820XL/5820XL-EVS system can support a total of 508 SD SLC detectors and modules, in
any combination. 127 devices can be attached to 5820XL/5820XL-EVS control panel. Each optional
5815XL adds another 127 devices. Add up to three 5815XLs to 5820XL/5820XL-EVS system to achieve
the 508 point capacity.
5.4 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.
5.4.1 Wiring 5815XL 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 Table 5-1 and Table 5-2.
Table 5-1 Maximum Distance for SK Devices
Wire Gauge Max. Distance for SK Modules
22 AWG 1200 feet
18 AWG 3100 feet
16 AWG 4900 feet
14 AWG 7900 feet
12 AWG 10,000 feet
Table 5-2 Maximum wiring distance for SD Devices
Wire Gauge Max. Distance for SD Modules
22 AWG 1500 feet
18 AWG 3900 feet
16 AWG 6200 feet
14 AWG 10,000 feet