TRIGA TR-FFT - Multi-Phone Jack Audio Circuit Wired in Class B Configuration

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PRELIMINARY: TR-FFT Fire Fighter’s Telephone Manual — LS10309-001TR-E:A 04/28/2021 25

Wiring Requirements for the Audio Telephone Circuit Audio Phone Circuit Installation

5.3.3 Multi-Phone Jack Audio Circuit Wired in Class B Configuration

For information on the wiring specifications, see Section 5.3.1. Figure 5.4 illustrates how to wire the Multi-Phone Jack Audio

Circuit (Class B) and the SLC for (Class B) configuration. In the Multi-Phone Jack configuration, the maximum mini-monitor

contact wiring resistance between to the first and the last TR-FPJ must be less than 100 ohms.

Figure 5.4 Multi-Phone Jack Audio Circuit Wired in Class B

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