ABAT Power Systems & Backup Power for Alarm Systems

Question 1

According to NFPA 72 and UL 681, what is the minimum standby battery backup time required for a residential burglar alarm control panel?

Accepted Answer

24 hours

Answer

4 hours

Answer

8 hours

Answer

72 hours

Question 2

Which type of battery is most commonly used as the primary backup power source in residential and commercial burglar alarm control panels?

Accepted Answer

Sealed lead-acid (SLA)

Answer

Lithium-ion (Li-ion)

Answer

Nickel-cadmium (NiCd)

Answer

Nickel-metal hydride (NiMH)

Question 3

What is the typical float charge voltage applied to a 12V sealed lead-acid alarm panel battery?

Accepted Answer

13.5–13.8 V

Answer

11.5–12.0 V

Answer

12.5–12.8 V

Answer

14.4–14.8 V

Question 4

When testing a standby battery in an alarm panel, a technician measures 11.2 V under load. What does this indicate?

Accepted Answer

The battery is sulfated or failing and should be replaced

Answer

The battery is fully charged

Answer

The battery is at 50% charge

Answer

The charger is supplying too much voltage

Question 5

An alarm panel's power supply draws 500 mA during normal operation and 1.5 A when all sirens are active. The backup battery is rated at 7 Ah. Approximately how long will the battery sustain the panel in alarm state only?

Accepted Answer

About 4.7 hours

Answer

About 1.5 hours

Answer

About 14 hours

Answer

About 3.5 hours

Question 6

What does the UL listing require a burglar alarm power supply to do when AC power is lost?

Accepted Answer

Automatically switch to battery backup without interruption to the protected zone circuits

Answer

Immediately trigger a trouble signal at the keypad

Answer

Disconnect all peripheral devices to conserve battery

Answer

Shut down the panel and log the event

Question 7

Which wire gauge is typically required for the 120 VAC connection to a hardwired residential alarm panel transformer to comply with NEC Article 725?

Accepted Answer

14 AWG

Answer

18 AWG

Answer

16 AWG

Answer

12 AWG