CFAA Fire Alarm Technician · Question
Why must Signaling Line Circuits (SLC) utilizing high-speed digital communications often use twisted-shielded pair wiring?
S524 4.2.1.2 notes that DCLA/DCLB (Data Communication Links) involving low-level signaling require shielding to ensure signal integrity against RFI/EMI.
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Question: Why must Signaling Line Circuits (SLC) utilizing high-speed digital communications often use twisted-shielded pair wiring?
Answer options:
- Increase voltage drop capacity
- Verify circuit continuity ✅ Protect against electromagnetic interference (EMI)
- Ground the device chassis
Correct answer: Protect against electromagnetic interference (EMI)
Explanation: S524 4.2.1.2 notes that DCLA/DCLB (Data Communication Links) involving low-level signaling require shielding to ensure signal integrity against RFI/EMI.
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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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