CFAA Fire Alarm Technician · Question
According to ULC-S524, what is the maximum area or number of devices that can be lost due to a single short-circuit fault on a DCL?
Clause 4.2.1.3 states that short-circuit isolators shall be installed so that a single short-circuit fault does not result in the loss of more than one floor or
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Question: According to ULC-S524, what is the maximum area or number of devices that can be lost due to a single short-circuit fault on a DCL?
Answer options:
- All detectors on one loop
- More than 5 devices ✅ More than one floor or one fire zone
- The entire control unit
Correct answer: More than one floor or one fire zone
Explanation: Clause 4.2.1.3 states that short-circuit isolators shall be installed so that a single short-circuit fault does not result in the loss of more than one floor or one fire zone.
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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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