I know that in accordance with NFPA 72, 20% spare capacity for every Loop/SLC is required? But I don't know the reference. Can anyone mention the reference if I am correct? If I am wrong please also mention it.
You might be correct
In the case of visible alarm notification appliances, the IBC and IFC require you to install these appliances in all public and common use areas. The only exception to this requirement is where employee work areas have proper audible alarm coverage. Even so, the design of the notification appliance circuits serving those work areas must include not less than 20 percent spare capacity to account for the potential future need to add visible notification appliances to accommodate hearing-impaired employees
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From international fire code::
907.5.2.3.2 Employee work areas. Where employee workareas have audible alarm coverage, the notification appliancecircuits serving the employee work areas shall be initiallydesigned with a minimum of 20-percent spare capacity toaccount for the potential of adding visible notification appliancesin the future to accommodate hearing impairedemployee(s).♦This section provides for spare capacity on notificationcircuits to allow for those with hearing impairmentsto be accommodated as necessary. This sparecapacity is intended to eliminate the potential foroverloading notification circuits when a hearingimpairedperson is hired and needs to be accommodated,but reduces the initial construction cost assuch alarms may not be necessary in every situation.This section is intended to apply to employee workareas that are not common areas
Thanks for your reply. But I want to know what is mentioned NFPA 72 or is anything mentioned in NFPA 72??
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