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NFPA12 selector valve using?!!

Question asked by asim moustafa on Nov 15, 2015

Dear all, i didn't find any rules or restrictions for using selector valves to extinguish many hazards by a single bank of battery of cylinders, so i want to know the maximum number of hazards connected to the same group of cylinders? , It is mandatory to install a backup reserve bank of battery of cylinders, and There is a a maximum time limitation for recharging the battery of cylinders if it extinguished or not in case of installing one bank of cylinders?

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