Chapter 2. Installation and System Checkout
2-5
NAC Wiring
General Wiring Notes -- Apply to NACs on Main
System Board (MSB) and Expansion Power Supply
Refer to Figure 2-6 and Figure 2-7.
• All wiring must be 18 AWG (min.) to 12 AWG (max.).
• Conductors must test free of all grounds and stray volt-
ages before connection to appliances and panel.
• All wiring is supervised and power limited.
• Terminate Class B (Style Y) NACs as shown using 733-
894. For Canadian applications, mount end-of-line
resistor to TEPG-US Model 431537 EOL plate in accor-
dance with ULC-S527.
• Wire Class A (Style Z) NACs from B+/B- to each appli-
ance as shown. No EOL device is required. Connect
wires from +/- terminals of last appliance to the A+/A-
terminals as shown.
• System is shipped with 10K, 1/2 W resistors connected
across NAC B+/B- of each circuit. Remove this resistor
from any circuits in use. Leave resistor installed if cir-
cuits are unused.
• Voltage rating: Refer to “NAC Ratings” on Page 2-7 for
specific voltage specifications. Maximum ripple: 1/2V
peak-to-peak.
• Current rating: 2A maximum for either circuit. 3A total
between both circuits and Aux. 24 V load.
• Terminal designations (+/-) are for the alarm state.
• When using two-wire audible/visible appliances, maxi-
mum wiring capacitance must be considered. For
TrueAlert Non-Addressable notification appliances,
.22uF maximum is allowed.
• If wiring is routed outside the building, use of a listed
secondary protector is required. Use Simplex 2081-
9028 or 2081-9044. A protector must be installed at
each building exit/entrance. Each 2081-9028 adds .2
ohms wiring resistance. 2081-9044 adds 6 ohms wiring
resistance. Use of 2081-9044 will greatly reduce wiring
distance.
• Wiring chart gives max. distance for 1/4 -2A loads. For
Class B circuits wiring distance is from panel terminals
to last appliance. For Class A circuits, wiring distance is
from panel terminals to last appliance and back to panel
terminals. Use of 2081-9044 reduces wiring distance.
Location of Expansion Power Supply NACs (If
Used)
The Expansion Power Supply (EPS) is located to the bottom
right of the main system board (MSB), as shown below. Wir-
ing guidelines for these NACs are identical to the guidelines
for the MSB NACs.
Table 2-1 Wiring Distances
Maximum Wiring Distance in Feet
Alarm
Current
(Amps)
18
AWG
16
AWG
14
AWG
12
AWG
Line
Resistance
(Ohms)
.25 840 1335 2126 3382 12
.50 420 667 1063 1691 6
.75 280 445 709 1127 4
1.0 210 334 532 845 3
1.25 168 267 425 676 2.4
1.50 140 222 354 564 2
1.75 120 191 304 483 1.71
2.0 105 167 266 423 1.5
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