Page 33 579-1102 Rev H
4007ES and 4007ES Hybrid Fire Alarm Systems Installation Manual
6.8 Auxiliary power selection
AUX PWR/SNAC overview
The AUX PWR/SNAC terminal block is located on the top left corner of the power supply. Using the ES Panel Programmer, this point can be configured
as either a 24V Auxiliary (AUX) power or as a simple reverse polarity Notification Appliance Circuit (NAC). This circuit does not support TrueAlert
addressable devices nor non-addressable SmartSync appliances.
The AUX PWR/SNAC is rated 2 A maximum. The current used is deducted from the total available power supply current.
Fig 27: AUX/SNAC
terminal
Output rating: 29.5 V maximum
Current Rating: 2 A, maximum.
Earth Detection
Threshold
10K ohms minimum from either positive
or negative terminals.
Wiring Gauge:
18 AWG (min.)
to 12 AWG (max.).
Wiring Notes:
1. All wiring from the AUX/SNAC is power limited.
2. The conductors must test free of all grounds and stray voltages before connection to appliances and panel.
3. Terminate Class B NACs, as shown, using a 733- 894 EOL. For Canadian applications, mount end-of-line resistor to a Simplex-US Model 431537
EOL plate in accordance with ULC-S527.
4. If the wiring is routed outside the building, use of a listed secondary protector is required. Use Simplex2081-9028 (rated 5 A) or 2081-9044 (rated
0.2 A). A protector must be installed at each building exit or entrance. Each 2081-9028 adds 0.2 ohms wiring resistance. 2081-9044 adds 6 ohms
wiring resistance, and greatly reduces the wiring distance.
Fig 28: Simple NAC wiring
Table 25: Simple NAC wiring limits
Alarm current 20 AWG 18 AWG 16AWG 14 AWG 12 AWG Line resistance (Ohms)
0.25 617 ft 981 ft 1560 ft 2480 ft 3944 ft 14.00
0.50 308 ft 490 ft 780 ft 1240 ft 1972 ft 7.00
0.75 206 ft 327 ft 520 ft 827 ft 1315 ft 4.67
1.00 154 ft 245 ft 390 ft 620 ft 986 ft 3.50
1.25 123 ft 196 ft 312 ft 496 ft 789 ft 2.80
1.50 103 ft 163 ft 260 ft 413 ft 657 ft 2.33
1.75 88 ft 140 ft 223 ft 354 ft 563 ft 2.00
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