Tyco 4100U 1.Class A Wiring Distances, Alarm, Max Distance, Current @, w/ 18 AWG, w/ 16 AWG

Class A NAC Wiring Table

Table 7-1 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 7-1 to calculate wire distances for your application if you are using Class A wiring.

Table 7-1. Class A Wiring Distances

Alarm	Max Distance	Max Distance	Max Distance		Max Distance	DC
Current @	w/ 18 AWG	w/ 16 AWG	w/ 14 AWG		w/ 12 AWG
						Resistance
24 V	(0.8231 mm2)	(1.309 mm2)	(2.081 mm2)		(3.309 mm2)
0.25 A	420 ft. (128 m)	667 ft. (203	1,063 ft. (324		1,691 ft. (515	6 Ohms
		m)	m)		m)
0.50 A	210 ft. (64 m)	334 ft. (102	532 ft.	(162 m)	845 ft. (258 m)	3 Ohms
		m)
0.75 A	140 ft. (43 m)	222 ft. (68 m)	354 ft.	(108 m)	564 ft. (172 m)	2 Ohms
1 A	105 ft. (32 m)	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
1.75 A	60 ft. (18 m)	95 ft. (29 m)	152 ft. (46 m)		242 ft. (74 m)	0.86 Ohm
2 A	53 ft. (16 m)	83 ft. (25 m)	133 ft. (41 m)		211 ft. (64 m)	0.75 Ohm
2.25 A	47 ft. (14 m)	74 ft. (23 m)	118 ft. (36 m)		188 ft. (57 m)	0.67 Ohm
2.50 A	42 ft. (13 m)	67 ft. (20 m)	106 ft. (32 m)		169 ft. (51 m)	0.60 Ohm
2.75 A	38 ft. (12 m)	61 ft. (19 m)	97 ft.	(30 m)	154 ft. (47 m)	0.55 Ohm
3 A	35 ft. (11 m)	56 ft. (17 m)	89 ft.	(27 m)	141 ft. (43 m)	0.50 Ohm

Notes:

•Max Distance = distance from SPS/RPS to last appliance.

•This table is calculated at 49 degrees Centigrade (120 degrees Fahrenheit). If you are installing in locations that could be exposed to higher temperatures, refer to NEC Tables 7 and 8 in NFPA code, or applicable local standard.

•Distances are based on a 3 V drop, and take into account the worst-case panel output voltage. These distances are worst case to allow for one single load at the furthest point.

•If circuit integrity wire is used instead of housing cable in a fire-rated enclosure, reduce wiring distances by 38 feet (12 m) for every 10 feet (3 m) of potential exposure.

•For other wire gauges (e.g. 4 mm2) multiply the distance specified for the nearest wire size by the ratio of the wire area, e.g. for 3A on 4 mm2 look up 3A on 12AWG (3.3 mm2) and multiply the resulting 43m x 4.0/3.3 = 52m.

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