CFAA Fire Alarm Technician · Question
Where must the End-of-Line (EOL) resistor be located in a Class B notification appliance circuit?
Class B NACs require the EOL to be at the last device to ensure the entire length of the wire is supervised by the supervisory current. CAN/ULC-S524 §3.1.2.1.
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Question: Where must the End-of-Line (EOL) resistor be located in a Class B notification appliance circuit?
Answer options:
- In the control panel
- At the first device
- In a separate junction box near the panel ✅ At the last device on the circuit
Correct answer: At the last device on the circuit
Explanation: Class B NACs require the EOL to be at the last device to ensure the entire length of the wire is supervised by the supervisory current. CAN/ULC-S524 §3.1.2.1.
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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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