Back-up amplifier as per NFPA 72

R

Thread Starter

Rakesh Pathak

In an addressable fire alarm system 7 nos. of supervised power amplifiers are used for 5 - speaker zones (3 zones - each having one amplifier and 2 zones each having two amplifiers). I would like to know how many back-up amplifiers shall be provided for these 7 nos. of supervised power amplifiers to switch over to back-up amplifier in case of amplifier failure as per NFPA - 72.

Is it one back-up amplifier for each amplifier
OR one back-up amplifier for each zone
OR one amplifier for all zones.
 
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