Chapter 2. Installation/System Checkout
2-5
Class A/Class B NAC Wiring
The following guidelines and restrictions apply to notifica-
tion appliance circuits (NACs) located on either the main
system board (MSB) or on the Expansion Power Supply
(EPS).
• All wiring to 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.
• Wire Class A (Style Z) NACs from B+ and B- to each
appliance as shown. No EOL device is needed. Connect
wires from +/- terminals of the last appliance to the
A+/A- terminals as shown.
• Voltage Rating: Refer to “NAC Ratings” on Page 2-7
for specific voltage specifications. Maximum ripple:
1/2 V peak-to-peak.
• Current rating 2A max. for either circuit. 3A total
between both NAC circuits and AUX 24V load.
• When using the following SimplexMulti-Candela appli-
ances, each NAC is rated for 2A max.
- 4906-9101
- 4906-9102
- 4906-9103
- 4906-9104
- 4906-9127
- 4906-9128
- 4906-9129
- 4906-9130
- 4906-9151
- 4906-9153
- 4906-9154
• For all other UL-listed notification appliances, each
NAC is rated at 1.5A max.
• Synchronization of strobes across all NACs in a system
is UL-listed for all of the above SimplexMulti-Candela
models, with a maximum of 34 appliances on a NAC
(15 Cd setting).
• Terminal designations are for the alarm state (+/-).
• If wiring is routed outside the building, use of a listed
secondary protector is required. Use Simplex Number
2081-9028 or 2081-9044. A protector must be installed
at each building exit/entrance. Each 2081-9028 adds .2
ohm wiring resistance. Each 2081-9044 adds 6 ohms
wiring resistance. Use of the 2081-9044 will signifi-
cantly reduce wiring distance.
• System is shipped with 10K, 1/2W resistors connected
across NAC B+/B- for each circuit. Remove this resis-
tor from any circuits in use. Leave it installed if circuits
are unused.
• Wiring chart gives maximum distance for 1/4 - 2 A
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 terminals. Use of Simplex Model 2081-
9044 will reduce the wire distance.
• When using two-wire audible/visible appliances, maxi-
mum wiring capacitance of .22 uF must be considered.
• Terminate Class B (Style Y) NACs as shown using Sim-
plex 733-894 (4081-9008) 10K 1/2 W resistor harness.
For Canadian applications, mount end-of-line resistor to
TEPG-US Model 431537 EOL plate in accordance with
ULC-S527.
• The Expansion Power Supply (if used) mounts next to
the MSB. NAC wiring is routed within the cabinet as
shown below.
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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