Tyco 4100U Power Supply Wiring Distances, Continued, 2.Class B Wiring Distances, Alarm, Current @

Power Supply Wiring Distances, Continued

Class B NAC Wiring Table

Table 7-2 lists the maximum distances from the NAC terminal block to the last appliance in a Class B configuration, depending on wire gauge and current. Use Table 7-2 to calculate wire distances for your application if you are using Class B wiring.

Table 7-2. Class B Wiring Distances

Alarm	Max Distance	Max Distance	Max Distance	Max Distance w/	DC
Current @	w/ 18 AWG	w/ 16 AWG	w/ 14 AWG	12 AWG
					Resistance
24 V	(0.8231 mm2)	(1.309 mm2)	(2.081 mm2)	(3.309 mm2)
0.25 A	840 ft. (256 m)	1,335 ft. (407 m)	2,126 ft. (648 m)	3,382 ft. (1,031 m)	12 Ohms
0.50 A	420 ft. (128 m)	667 ft. (203 m)	1,063 ft. (324 m)	1,691 ft. (515 m)	6 Ohms
0.75 A	280 ft. (85 m)	445 ft. (136 m)	709 ft. (216 m)	1,127 ft. (344 m)	4 Ohms
1 A	210 ft. (64 m)	334 ft. (102 m)	532 ft. (162 m)	845 ft. (258 m)	3 Ohms
1.25 A	168 ft. (51 m)	267 ft. (81 m)	425 ft. (130 m)	676 ft. (206 m)	2.4 Ohms
1.50 A	140 ft. (43 m)	222 ft. (68 m)	354 ft. (108 m)	564 ft. (172 m)	2 Ohms
1.75 A	120 ft. (37 m)	191 ft. (58 m)	304 ft. (93 m)	483 ft. (147 m)	1.71 Ohms
2 A	105 ft. (32 m)	167 ft. (51 m)	266 ft. (81 m)	423 ft. (129 m)	1.5 Ohms
2.25 A	93 ft. (28 m)	148 ft. (45 m)	236 ft. (72 m)	376 ft. (115 m)	1.33 Ohms
2.50 A	84 ft. (26 m)	133 ft. (41 m)	213 ft. (65 m)	338 ft. (103 m)	1.2 Ohms
2.75 A	76 ft. (23 m)	121 ft. (37 m)	193 ft. (59 m)	307 ft. (94 m)	1.09 Ohms
3 A	70 ft. (21 m)	111 ft. (34 m)	177 ft. (54 m)	282 ft. (86 m)	1 Ohm

Notes:

•Max Distance = distance from SPS or 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 Table 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 86m x 4.0/3.3 = 104m.

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