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Model SK-FFT Manual — P/N 54711:B2 12/18/2020
Section 4: SLC Device Installation
4.1 List of SLC Devices
The following SLC device can be used with the Fire Fighters Phone. See the device installation instructions for more information (packaged
with the device).
4.2 Maximum Number of Devices
The SK-FFT supports up to 48 SK-MINIMON devices on one FFT system.
4.3 Wiring Requirements for SLC Device
The following information applies to the SK-MINIMON - Mini Monitor module.
4.3.1 Wiring SLC in (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 to the farthest SLC device.
Maximum loop length depends on the wire gauge.
Figure 4.1 and Figure 4.2 show how length is determined for out and back tap T-Tap style wiring.
.
Figure 4.1 Calculating the Wire Run Length for a Simple Out and Back
!
CAUTION: TO PREVENT THE RISK OF ELECTRICAL SHOCK AND DAMAGE TO THE UNIT, SHUT OFF THE POWER AT
THE CONTROL PANEL WHEN YOU INSTALL OR SERVICE THE CONTROL PANEL.
T
Device Part Number
Model Name/Description
Install Sheet PN
SK-MINIMON
Mini Monitor Module
I56-3444-000
SK-ISO
Fault Isolator Module
I56-3445-000
Table 4.1
Wire Gauge
Max. Distance
22 AWG
1200 feet
18 AWG
3100 feet
16 AWG
4900 feet
14 AWG
7900 feet
12 AWG
10,000 feet