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PRELIMINARY: TR-FFT Fire Fighter’s Telephone Manual — LS10309-001TR-E:A 04/28/2021 23
Section 5: Audio Phone Circuit Installation
5.1 List of Devices
The following device can be used with the Fire Fighter’s Telephone. For more information, refer to the device installation
instructions (packaged with the device).
5.2 Maximum Number of Devices
The TR-FFT supports up to 72 zones. Each zone consists of one addressable monitor module (TR-MINIMON) and a mini-
mum of one Fire Fighter Telephone Jack (TR-FPJ).
5.3 Wiring Requirements for the Audio Telephone Circuit
In Section 5.3, the information pertains to the TR-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.
If you use the shielded cable, attach the shield to the Grounding Stud below TB6 of the TR-FFT.
Figure 5.1 illustrates the single phone jack configuration wiring for the audio circuit and the SLC for Class B configuration.
Audio circuits must be connected to the TR-FFT phone out terminals for all Class B audio configurations.
.
Figure 5.1 Single Phone Jack Audio Circuit Wired Class B
Figure 5.2 EOL Example
Part Number Description
TR-FPJ Fire Fighter Telephone Jack
Table 5.1 Devices
54 Ohm maximum impedance - 12 to 18 AWG.
Twisted, shielded wire is recommended for maximum protection against EMI and AFI emissions and susceptibility.
NOTE:
Do not ground the shield on both ends.
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).
TR-FFT
TR-FPJ
TR-FPJ
TR-FPJ