CFAA Fire Alarm Technician · Question
Which of the following conditions will cause a standard Class A (DCLA) circuit without isolator modules to fail to communicate with downstream devices?
While addressable loops (DCLA) and conventional loops (Class A) can handle one open, a short circuit across the pair typically disables the entire circuit unles
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Question: Which of the following conditions will cause a standard Class A (DCLA) circuit without isolator modules to fail to communicate with downstream devices?
Answer options: ✅ A short circuit across the conductors
- A single open circuit
- A single ground fault
- A loose wire at one terminal
Correct answer: A short circuit across the conductors
Explanation: While addressable loops (DCLA) and conventional loops (Class A) can handle one open, a short circuit across the pair typically disables the entire circuit unless isolators are used. CAN/ULC-S524 §3.3.1.1.
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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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