NFPA 24.4.2.16 Mass Notification Priority Level

[haze10]

I am not sure what this section is saying about interlacing messages. If the Risk Analysis determines that the safest course of action is some prescribed method of interlacing messages, ie, three plays a priority 1 message followed by one play of a priority 2 and one play of a priority 3 message - is the code prohibiting this? For MN with a priority greater than fire, it says to interrupt the fire if playing and to not play the fire again until the notification alarm releases the system. But can't you release the notification alarm after so many plays and then interlace in lower priority messages?

 

[stookeyfpe]

Your application is based on a risk assessment for a mass notification system. You didn't indicate the edition of NFPA 72 so I am just speculating. What did the risk assessment conclude since you are doing a performance design and you have not indicated any design conditions or basis for the specification.

 

[haze10]

NFPA 72 2010 Edition.
The group that did the risk analysis determined that they want to interlace lower priority messages with higher ones. Higher ones to play first for 3 repeat and lower ones for one repeat.

My question is if this is permitted, the concept of interlacing messages, or can you one play the highest priority message and let the lower ones queue until the highest one is cleared.

 

[stookeyfpe]

You're dealing with a performance based design. NFPA 72, 2010 edition is silent on this. You need to ask the individuals who prepared the risk analysis.