CFAA Fire Alarm Technician · Question
What is the primary requirement for 'Class A' data communication links (DCL) to ensure survivability in the event of local wire damage?
S524 Clause 4.2.1.2 requires Class A (DCL) loops to have outgoing and return conductors in separate raceways or separated by a fire-rated barrier to prevent a s
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Question: What is the primary requirement for 'Class A' data communication links (DCL) to ensure survivability in the event of local wire damage?
Answer options:
- Shielding ✅ Physical separation/Separate raceways
- Twisted-pair winding
- Grounding the return path
Correct answer: Physical separation/Separate raceways
Explanation: S524 Clause 4.2.1.2 requires Class A (DCL) loops to have outgoing and return conductors in separate raceways or separated by a fire-rated barrier to prevent a single event from taking out both paths.
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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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