Appendix C: Applications
216 P/N 3102352-EN • REV 005 • ISS 28DEC18
Programming sounder bases for a T3T4 Fire Alarm/CO emergency
signaling application per NFPA 720, UL 2017
Typical wiring for a T3T4 Fire/CO alarm application
The 24 VDC riser that supplies power to the sounder bases is supervised using a FX-NAC
Analog NAC Module.
Figure 58: Wiring the sounder base for a T3T4 Fire/CO alarm
(1) AUX riser from previous device. Use a power-limited and regulated 24 VDC primary or auxiliary power supply
that is UL/ULC Listed for fire protective signaling systems.
(2) T3T4 module
Note: T3T4+ connects to the SIG– terminal on the sounder base and T3T4– connects to the SIG+ terminal
(3) Signaling line circuit IN
(4) Compatible sounder base
(5) FX-NAC
(6) 47 kΩ EOLR
Notes
• For PD, PHD, and PDD detectors configured as “Supervisory Non-latching” device type or
for PCD detectors (smoke element) configured as “Smoke Supervisory Non-latching”
device type, if the base is Relay/Sounder, then the follow type option cannot be configured
as “Head.” The follow type in this case should be set to “Alarm.”
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