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Hochiki and SK SLC Device Installation
151209 5-3
5.3 Maximum Number of Devices
The 5820XL supports SK or Hochiki devices on one 5820XL 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 5820XL system can support a total of 396 SK detectors and 396 SK
modules. 99 detectors and 99 modules can be connected to the built-in SLC loop. Each
optional 5815XL adds another 99 detectors and 99 modules. Add up to three 5815XLs to a
system to achieve the maximum number of devices on the system.
OR
• Hochiki Devices–A 5820XL system can support a total of 508 Hochiki SLC detectors and
modules, in any combination. 127 devices can be connected to the built-in SLC loop. Each
optional 5815XL adds another 127 devices.
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 devices and 50 ohms for Hochiki devices.
Maximum loop length depends on the wire gauge. See Table 5-1 for SK and Table 5-2 for
Hochiki.
Table 5-2 Maximum wiring distance for Hochiki devices
Table 5-1 Maximum wiring distance for SK modules
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 Hochiki
22 AWG 1500 feet
18 AWG 3900 feet
16 AWG 6200 feet
14 AWG 10,000 feet