patricialovett9653 patricialovett9653
  • 22-01-2024
  • Engineering
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Secondary power supplies must supply power to an in-building fire emergency voice/alarm communications fire alarm system for a minimum of ? of standby followed by ? of alarm?
a. 24 hours / 5 minutes
b. 24 hours / 15 minutes
c. 48 hours / 5 minutes
d. 48 hours / 15 minutes

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