6-2
Power supply wiring distances
Overview Before wiring from any type of power supply to notification appliances, check Tables 6-1 and
6-2 for wiring distances.
Class A NAC
wiring table
Table 6-1 lists the maximum distances from the NAC terminal block to the last appliance in a
Class A configuration, depending on wire gauge and current. Use Table 6-1 to calculate wire
distances for your application if you are using Class A wiring.
Note:
• Max distance = distance from MSS to last appliance.
• This table is calculated at 49
o
C (120
o
F). If you are installing in locations that could be exposed to
higher temperatures, refer to NEC Table 8.
• Distances are based on a 3V drop, and take into account the worst-case panel output voltage.
• If circuit integrity 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.
Table 6-1. Class A wiring distances
Alarm current
@ 24 VDC
Max distance
w/ 18 AWG
(0.8231 mm
2
)
Max distance
w/ 16 AWG
(1.309 mm
2
)
Max distance
w/ 14 AWG
(2.081 mm
2
)
Max distance
w/ 12 AWG
(3.309 mm
2
)
DC
resistance
0.25 A 420 ft (128 m) 667 ft (203 m) 1,063 ft (324 m) 1,691 ft (515 m) 6 Ohms
0.50 A 210 ft (64 m) 334 ft (102 m) 532 ft (162 m) 845 ft (258 m) 3 Ohms
0.75 A 140 ft (43 m) 222 ft (68 m) 354 ft (108 m) 564 ft (172 m) 2 Ohms
1.00 A 105 ft (32m) 167 ft (51 m) 266 ft (81 m) 423 ft (129 m) 1.5 Ohms
1.25 A 84 ft (26 m) 133 ft (41 m) 213 ft (65 m) 338 ft (103 m) 1.2 Ohms
1.50 A 70 ft (21 m) 111 ft (34 m) 177 ft (54 m) 282 ft (86 m) 1 Ohm
1.75A 60ft (18m) 95ft (29m) 152ft (46m) 242ft (74m) 0.86 Ohm
2.00A 53ft (16m) 83ft (25m) 133ft (41m) 211ft (64m) 0.75 Ohm
2.25A 47ft (14m) 74ft (23m) 118ft (36m) 188ft (57m) 0.67 Ohm
2.50A 42ft (13m) 67ft (20m) 106ft (32m) 169ft (51m) 0.60 Ohm
2.75A 38ft (12m) 61ft (19m) 97ft (30m) 154ft (47m) 0.55 Ohm
3.00A 35ft (11m) 56ft (17m) 89ft (27m) 141ft (43m) 0.50 Ohm
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