ABAT Power Systems & Backup Power for Alarm Systems 2

Question 1

A technician is sizing a backup battery for a commercial alarm panel that draws 800 mA standby and must provide 24 hours standby plus 5 minutes of full alarm (2 A). What minimum Ah rating is needed?

Accepted Answer

18 Ah

Answer

7 Ah

Answer

12 Ah

Answer

26 Ah

Question 2

What is the purpose of a battery supervision circuit in an alarm control panel?

Accepted Answer

To detect a missing, disconnected, or low battery and generate a trouble condition

Answer

To regulate the charging voltage to the battery

Answer

To prevent the battery from overcharging during extended AC power periods

Answer

To boost the battery output voltage when AC power fails

Question 3

What is the recommended maximum age for a sealed lead-acid backup battery used in a burglar alarm panel before scheduled replacement?

Accepted Answer

3–5 years

Answer

1 year

Answer

2–3 years

Answer

7–10 years

Question 4

When an alarm panel displays a 'LOW BATTERY' trouble condition while AC power is present, what is the most likely cause?

Accepted Answer

The battery has sulfated or lost capacity below the panel's detection threshold

Answer

The transformer is producing too little voltage

Answer

The panel's internal fuse has blown

Answer

The battery is being overcharged

Question 5

Which standard governs the installation and performance requirements for power supplies used in burglar alarm control panels in the United States?

Accepted Answer

UL 681

Answer

UL 294

Answer

ANSI/SIA CP-01

Answer

NFPA 101

Question 6

A plug-in transformer for an alarm panel is rated 16.5 VAC at 40 VA. What is the maximum current this transformer can supply?

Accepted Answer

2.42 A

Answer

0.82 A

Answer

1.45 A

Answer

3.00 A

Question 7

What is the primary risk of connecting multiple alarm panel auxiliary devices (sirens, keypads, sensors) that collectively exceed the panel's auxiliary power supply rating?

Accepted Answer

Excessive current draw can damage the power supply, trip the internal resettable fuse, or cause erratic system behavior

Answer

The panel will automatically switch to a higher power mode

Answer

The backup battery will charge faster to compensate

Answer

All zones will report a tamper alarm simultaneously