Cooper/Wheelock Compatible NAC Devices
The Sigma A-CP Fire Control Panel accepts compatible Cooper/Wheelock NAC devices for use on the
special application outputs of NAC 1 and NAC 2. The number of compatible devices that NAC 1 and
NAC 2 can each safely operate is limited by a 2.5 A current threshold. Installers must limit the
population of compatible devices in each NAC circuit by this 2.5 A threshold.
A circuit design is limited by the power source and device-loads connected to it. A combination of
device-loads can be safely installed in a circuit when the circuit is operated within the constraints of the
power source threshold. There are no exclusions for the amount of device-loads that can be safely
installed in the circuit as long as the maximum current load is below the output current available from
the power source.
The Sigma A-CP Fire Control Panel can also safely operate combinations of device-loads on NAC 1 and
NAC 2. These device-loads can include combinations such as strobes, horns, strobe/chimes,
strobe/horns and speaker strobes. The sum of this device-load combination is limited by the 2.5 A
available from each NAC output. Kentec recommends designing and installing combinations of NAC
circuits based on this “device-load” versus “current-available” understanding.
Reference manufacturer data sheets for individual device loads and then total the loads to determine if the
sum exceeds the 2.5 A threshold of each NAC output.
Reference Section 1, Installation Wiring Documents, Notification Appliance Circuit (NAC), Specifications for
additional parameters related to the NAC 1 and NAC 2 outputs.
UL Listing Requirement
All control panel designs restrict the number of NAC devices installed in circuits based on the rated
current threshold. Some control panel designs further restrict the number of NAC devices installed in
circuits based on device synchronization in addition to the rated current threshold. These control
panel designs can reduce the population of NAC devices below the number of devices that would be
considered for the rated current threshold.
NAC outputs of the Sigma A-CP Fire Control Panel are not limited by conditions other than the
maximum rated current threshold. NAC outputs of the Sigma A-CP Fire Control Panel can operate
combinations of Kentec authorized NAC devices as long as the total load of NAC 1 and NAC 2 does not
exceed 4 A.
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