Class A Nac Wiring Table - Simplex XPS Installation Instructions Manual

Step 4. XPS field wiring
The XPS provides three outputs for reverse-polarity notification appliance circuits. This section describes basic NAC wiring from the XPS to 4100-
compatible appliances.
NAC wiring styles
The XPS supports both Class A and Class B NAC wiring.
Class A wiring provides a circuit path XPS in the event of a single open circuit somewhere in the loop. Class A wiring requires that two wires are routed
from the XPS to each appliance, and then back again to the XPS.

Class A NAC wiring table

Table 2 lists the maximum distances from the XPS to the last appliance in a Class A configuration, depending on wire gauge and current. Use Table 2 to
calculate wire distances for your application if you are using Class A wiring.
Max. distance w/ 18
Alarm current @ 24 V
AWG (0.8231 mm²)
0.25 A 420 ft (128 m)
0.50 A 210 ft (64 m)
0.75 A 140 ft (43 m)
1 A 105 ft (32 m)
1.25 A 84 ft (26 m)
1.50 A 70 ft (21 m)
1.75 A 60 ft (18 m)
2 A 53 ft (16 m)
2.25 A 47 ft (14 m)
2.50 A 42 ft (13 m)
2.75 A 38 ft (12 m)
3 A 35 ft (11 m)
Note:
• Max. distance = distance from XPS to last appliance.
• This table is calculated at 50°C (120°F). If you are installing in locations that could be exposed to higher temperatures, refer to NEC Table 8.
• Distances are based on a 3 V drop, and take into account the worst-case panel output voltage.
• If CI wire is used instead of housing cable in a fire rated enclosure, reduce wiring distances by 38 ft (12 m) for every 10 ft (3 m) of potential
exposure.
• If Wheelock appliances employing EZ Mount SNAP bases are used, reduce the wiring distance and wiring resistance by:
- 12 gauge wire: 3.5 ft for each appliance, 0.0125 ohm for each appliance
- 14 gauge wire: 2.2 ft for each appliance, 0.0125 ohm for each appliance
- 16 gauge wire: 1.4 ft for each appliance, 0.0125 ohm for each appliance
- 18 gauge wire: 0.9 ft for each appliance, 0.0125 ohm for each appliance
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Table 2: Class A wiring distances
Max. distance w/ 16 Max. distance w/ 14
AWG (1.309 mm²) AWG (2.081 mm²)
667 ft (203 m) 1,063 ft (324 m)
334 ft (102 m) 532 ft (162 m)
222 ft (68 m) 354 ft (108 m)
167 ft (51 m) 266 ft (81 m)
133 ft (41 m) 213 ft (65 m)
111 ft (34 m) 177 ft (54 m)
95 ft (29 m) 152 ft (46 m)
83 ft (25 m) 133 ft (41 m)
74 ft (23 m) 118 ft (36 m)
67 ft (20 m) 106 ft (32 m)
61 ft (19 m) 97 ft (30 m)
56 ft (17 m) 89 ft (27 m)
XPS and XNAC Installation Instructions
Max. distance w/ 12
AWG (3.309 mm²)
1,691 ft (515 m)
845 ft (258 m)
564 ft (172 m)
423 ft (129 m)
338 ft (103 m)
282 ft (86 m)
242 ft (74 m)
211 ft (64 m)
188 ft (57 m)
169 ft (51 m)
154 ft (47 m)
141 ft (43 m)
DC resistance
6 ohm
3 ohm
2 ohm
1.5 ohm
1.2 ohm
1 ohm
0.86 ohm
0.75 ohm
0.67 ohm
0.60 ohm
0.55 ohm
0.50 ohm
574-772 Rev. Q