Knowledge and Skills Flashcards

Which wire gauge is most commonly used for connecting alarm system sensors to a control panel over short distances?

Answer: 22 AWG

22 AWG is the standard wire gauge for low-voltage alarm sensor runs due to its balance of flexibility and conductivity.

What is the purpose of an End-of-Line (EOL) resistor in a supervised alarm circuit?

Answer: To indicate a tamper or cut wire condition to the panel

An EOL resistor allows the panel to detect opens (cut wires) or shorts by monitoring the circuit's resistance value.

A passive infrared (PIR) motion detector primarily detects changes in what physical property?

Answer: Infrared radiation emitted by moving warm bodies

PIR sensors detect changes in infrared energy caused by a warm body moving through the sensor's field of view.

What NEC article primarily governs the installation of fire alarm systems?

Answer: Article 760

NEC Article 760 covers fire alarm systems, including wiring methods and conductor requirements.

When testing a heat detector's fixed-temperature rating, which tool is the safest and most recommended method?

Answer: A listed heat detector test instrument (heat gun)

Listed heat detector test instruments apply controlled, calibrated heat without risking damage or false alarm misinterpretation.

Which battery type is most commonly used as the standby power source in residential alarm control panels?

Answer: Sealed lead-acid (SLA)

Sealed lead-acid batteries are standard for alarm panel backup due to their reliable discharge characteristics and rechargeable nature.

A technician notices a 'low battery' trouble signal on a wireless smoke detector. What is the correct action?

Answer: Replace the battery with the manufacturer-specified type and test the device

The correct response is to replace the battery with the specified type and then functionally test the detector to confirm proper operation.