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6 Pelco Manual C478M-L (11/03)
Table C. Video Coaxial Cable Wiring Distances
Cable Type* Maximum Distance
RG59/U 750 ft (229 m)
RG6/U 1,000 ft (305 m)
RG11/U 1,500 ft (457 m)
* Minimum cable requirements:
75 ohms impedance
All-copper center conductor
All-copper braided shield with 95% braid coverage
Wire Gauge
Maximum distance from transformer to load
Table B. 24 VAC Wiring Distances
The following are the recommended maximum distances for 24
VAC applications and are calculated with a 10-percent voltage
drop. (Ten percent is generally the maximum allowable voltage
drop for AC-powered devices.)
20 AWG 18 AWG 16 AWG 14 AWG 12 AWG 10 AWG
(0.5mm
2
) (1.0mm
2
) (1.5mm
2
) (2.5mm
2
) (4.0mm
2
) (6.0mm
2
)
10 283 451 716 1142 1811 2880
(86) (137) (218) (348) (551) (877)
20 141 225 358 571 905 1440
(42) (68) (109) (174) (275) (438)
30 94 150 238 380 603 960
(28) (45) (72) (115) (183) (292)
40 70 112 179 285 452 720
(21) (34) (54) (86) (137) (219)
50 56 90 143 228 362 576
(17) (27) (43) (69) (110) (175)
60 47 75 119 190 301 480
(14) (22) (36) (57) (91) (146)
70 40 64 102 163 258 411
(12) (19) (31) (49) (78) (125)
80 35 56 89 142 226 360
(10) (17) (27) (43) (68) (109)
90 31 50 79 126 201 320
(9) (15) (24) (38) (61) (97)
100 28 45 71 114 181 288
(8) (13) (21) (34) (55) (87)
Total VA consumed
EXAMPLE:
An enclosure that requires 80 vA and is
installed 35 feet (10 m) from the transformer would require a
minimum wire gauge of 20 AWG.
NOTE:
Distances are calculated in feet; values in parenthe-
ses are meters.
EH3515-2 24 VAC Heater 25 watts 20 AWG 128 ft (39 m)
at 60 Hz Defroster 18 AWG 204 ft (62 m)
Blower 16 AWG 323 ft (98 m)
14 AWG 516 ft (157 m)
EH3515-3 230 VAC Heater 32 watts 20 AWG 21 ft (6 m)
at 50 Hz Defroster 18 AWG 34 ft (10 m)
Blower* 16 AWG 55 ft (16 m)
14 AWG 88 ft (26 m)
EH3515-1HD 120 VAC Heater 23 watts 20 AWG 21 ft (6 m)
at 60 Hz Defroster 18 AWG 66 ft (20 m)
16 AWG 54 ft (16 m)
14 AWG 87 ft (26 m)
EH3515-2HD 24 VAC Heater 23 watts 20 AWG 108 ft (32 m)
at 60 Hz Defroster 18 AWG 172 ft (52 m)
16 AWG 274 ft (83 m)
14 AWG 437 ft (133 m)
EH3515-3HD 230 VAC Heater 23 watts 20 AWG 11 ft (3 m)
at 50 Hz Defroster 18 AWG 18 ft (5 m)
16 AWG 28 ft (8 m)
14 AWG 45 ft (13 m)
Model Number Input Voltage Accessories Power Consumption Cable Size Cable Distance
Table A. Enclosure Accessory Wiring Distances (Continued)
*Blower and resistor are 4.5 watts each for a total circuit power of 9 watts.
Total VA