CFAA Fire Alarm Technician · Question
What is the generally accepted minimum Speech Transmission Index (STI) score for a 'Pass' in voice intelligibility per NFPA 72?
NFPA 72 is the primary source for the 'Common Intelligibility Scale' (CIS) target of 0.70 or 0.50 (STI) for life safety.
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Question: What is the generally accepted minimum Speech Transmission Index (STI) score for a 'Pass' in voice intelligibility per NFPA 72?
Answer options: ✅ 0.70 CIS / 0.50 STI
- 0.99 CIS / 0.90 STI
- 0.40 CIS / 0.30 STI
- 1.00 CIS / 1.00 STI
Correct answer: 0.70 CIS / 0.50 STI
Explanation: NFPA 72 is the primary source for the 'Common Intelligibility Scale' (CIS) target of 0.70 or 0.50 (STI) for life safety.
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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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