Table of Contents
Advertisement
5.1 List of Devices
5.2 Maximum Number of Devices
The SK-FFT supports up to 48 zones. Each zone consists of one addressable monitor module (SK-MINIMON) and a minimum of one Fire
Fighter Telephone Jack (FFT-FPJ).
5.3 Wiring Requirements for the Audio Telephone Circuit
The following information applies to the FFT-FPJ Fire Fighter Phone Jack.
5.3.1 Single Phone Jack Audio Circuit in Class B Configuration
No special wire is required for the Audio Telephone Circuit. The wire can be untwisted, unshielded, twisted or shielded as long as it meets
the National Electric code 760-51 requirements for power limited fire protective signaling cables.
54 Ohm maximum impedance - 12 to 18 AWG.
Twisted, shielded wire is recommended for maximum protection against EMI and AFI emissions and susceptibility.
If using shielded cable, attach the shield to Grounding Stud below TB6 of the FFT.
NOTE: Do not ground shield on both ends.
Figure 5.1 illustrates single phone jack configuration wiring the audio circuit and SLC for Class B Configuration. Audio circuits must be
connected to FFT phone out terminals for all Class B audio configurations
PRELIMINARY: Model SK-FFT Manual — P/N 54711:B2 12/18/2020
Section 5: Audio Phone Circuit Installation
Part Number
FFT-FPJ
Table 5.1 Devices
Figure 5.1 Single Phone Jack Audio Circuit Wired in Class B
Description
Fire Fighters Telephone Jack
.
Contact EOL Connected
(see Figure 5.2 for EOL
example)
Caution!
For System Supervision-For Terminals 2 and 3, do
not use looped wire under the terminals. Break wire
run to provide supervision of communications.
4.7K W, 1/2 watt ELR (Install on
the last device for Class B
telephone circuit only).
Figure 5.2 EOL Example
23
Advertisement
Table of Contents
