A) The pressure switch must be connected to a supervised initiating device circuit (IDC). B) The pressure switch must be connected to a signaling line circuit (SLC) using an addressable module. C) The pressure switch must be monitored for trouble conditions using an end-of-line resistor. D) A and C.
A) 6.5 Ah B) 7.0 Ah C) 7.5 Ah D) 8.0 Ah
A) 70% of all spaces must achieve an STI (Speech Transmission Index) of 0.70 or higher. B) The system must be tested for intelligibility in all occupied spaces. C) Intelligibility testing is only required for auditoriums and atriums. D) Voice systems do not require intelligibility testing if they use pre-recorded messages. nicet level 3 fire alarm practice test
D. A pressure switch is an initiating device, and it must be connected to a supervised circuit (IDC or via an addressable module). Any circuit using a contact closure must have an end-of-line resistor to supervise for opens. The SLC module provides supervision, but if connected as a dry contact to the SLC, the wiring must still be supervised unless listed otherwise. Question 3 (Battery Calculation – Math Section) A fire alarm system has a standby current draw of 0.250 amps for 24 hours and an alarm current draw of 4.0 amps for 15 minutes. Using NFPA 72 requirements (standby plus 5 minutes of alarm), what is the minimum required battery capacity in ampere-hours (Ah) before derating? A) The pressure switch must be connected to