3-12 
 
Adhere to the following guidelines when wiring Notification Appliance Circuits. 
 
  All wiring is to be 18 AWG (min.) to 12 AWG (max.) 
  Conductors must test free of all grounds. 
  All wiring is supervised and power limited. 
  Leave a 10K, 1/2 W (Part No. 431222) resistor across all unused NAC terminals.  See  4  in 
Figure 3-8. 
  Terminate Style Y (Class B) circuits with a listed 10K, 1/2 W (Part No. 431222) end-of-line 
resistor.  See  5  in Figure 3-8. 
  For Canadian applications, attach a 10K ½ W resistor (Part No. 431222) to a ULC-listed End 
of Line Device. 
  Terminate Style Z (Class A) circuits with a listed 10K, 1/2 W (Part No. 431222) end-of-line 
resistor.  See  6  in Figure 3-8. 
  Voltage rating – nominal 24 VDC, 0.5 V peak-to-peak ripple (max.) 
  Total available current from main power supply is 3 A.  If auxiliary power is used, available 
signal power is reduced accordingly. 
  Terminal designations “+” and “-” are for the alarm state. 
  Maximum alarm current is 2A per circuit.  See Table 3-2 for line distance.   
  The operation of the NAC (Off on Reset; Off on Silence) is determined by the setting of the 
NAC Operation programming option.  See Chapter 4 of this manual for information on setting 
this option. 
  When wiring NYC Abort operation, NAC1 is used for connecting bells and bell strobes 
associated with the investigation timer, NAC2 is used for connecting audible notification 
appliances, and RAC2 is used for connecting visual notification appliances. 
  When NAC wiring is routed outside the building, use Listed Secondary Protector 430685. A 
protector must be installed at the building entrance such that protected wiring is segregated 
from unprotected (outdoor) wiring. 
  Maximum open circuit voltage, non-alarm (standby) state is 29 VDC.  Maximum voltage for 
alarm state is 26 VDC.  Maximum current: 2ADC.  
 
Table 3-2.  Maximum Distance from Panel to Last Notification Appliance (Feet)  
 
 
 
 
Wiring Notification Appliance Circuits 
Guidelines 
Alarm 
Current 
Amps 
18 AWG  16 AWG  14 AWG  12 AWG 
Line 
Resistance 
(Ohms) 
0.25  840  1335 2126 3382  12 
0.50 420 667 1063 1691  6 
0.75 280 445 709 1127  4 
1  210 334 532 845  3 
1.25 168 267 425 676  2.4 
1.50 140 222 354 564  2 
1.75 120 191 304 483 1.71 
2  105 167 266 423  1.5