CFAA Fire Alarm Technician · Question
How is the redundant path of a Class A (DCLA) data communication link verified?
CAN/ULC-S537-19 Section 5.1.2.2 requires that on a DCLA (Class A) loop, an open circuit must be introduced to verify that the loop continues to operate from bot
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Question: How is the redundant path of a Class A (DCLA) data communication link verified?
Answer options:
- A short circuit is applied to the loop
- Power is disconnected from the Control Unit
- Each device is assigned a duplicate address ✅ An open-circuit is introduced to confirm the loop operates in both directions
Correct answer: An open-circuit is introduced to confirm the loop operates in both directions
Explanation: CAN/ULC-S537-19 Section 5.1.2.2 requires that on a DCLA (Class A) loop, an open circuit must be introduced to verify that the loop continues to operate from both directions.
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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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