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What does NAC stand for?

NAC stands for Notification Appliance Circuit

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Samples in periodicals archive:

The RPS can be activated by a notification appliance circuit (NAC) from a fire panel, optional control modules, or can be used in standalone applications to supply power to auxiliary devices (door holders, panel peripheral devices, etc.
Outputs may be independently programmed for steady, temporal code 3 or strobe synchronization, as well as for input-to-output follower mode, enabling the unit to maintain synchronization of notification appliance circuits.
The PS-24-8MC is capable of handling four class B or two class A output circuits with 3-amp rating and can connect to any 12-volt or 24-volt fire alarm control panel using notification appliance circuit inputs, dry contact closures, or addressable modules.