CFAA Fire Alarm Technician · Question
What is the standard unit of measurement used to rate the intensity of a visible fire alarm notification appliance?
CAN/ULC-S541 requires that strobes be marked with their light output in effective candela (cd). Standard ratings are 15, 30, 75, 110, etc.
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Question: What is the standard unit of measurement used to rate the intensity of a visible fire alarm notification appliance?
Answer options: ✅ Candela (cd)
- Lumens (lm)
- Foot-candles (fc)
- Watts (W)
Correct answer: Candela (cd)
Explanation: CAN/ULC-S541 requires that strobes be marked with their light output in effective candela (cd). Standard ratings are 15, 30, 75, 110, etc.
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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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