CFAA Fire Alarm Technician · Question
What is the specific requirement for verifying a Class A (redundant) Data Communication Link?
Class A circuits (DCLB/DCLC) must be tested for their capability to operate in the presence of a single open. This requires opening the loop and verifying all d
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Question: What is the specific requirement for verifying a Class A (redundant) Data Communication Link?
Answer options:
- It is not required for verification.
- Testing for a short circuit only.
- Opening the circuit and ensuring the system goes into alarm. ✅ Opening the circuit and ensuring all devices downstream and upstream continue to communicate.
Correct answer: Opening the circuit and ensuring all devices downstream and upstream continue to communicate.
Explanation: Class A circuits (DCLB/DCLC) must be tested for their capability to operate in the presence of a single open. This requires opening the loop and verifying all devices still communicate.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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