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6 Pelco Manual C1448M-C (8/02)
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 18 16 14 12 10
10 283 (86) 451 (137) 716 (218) 1142 (348) 1811 (551) 2880 (877)
20 141 (42) 225 (68) 358 (109) 571 (174) 905 (275) 1440 (438)
30 94 (28) 150 (45) 238 (72) 380 (115) 603 (183) 960 (292)
40 70 (21) 112 (34) 179 (54) 285 (86) 452 (137) 720 (219)
50 56 (17) 90 (27) 143 (43) 228 (69) 362 (110) 576 (175)
60 47 (14) 75 (22) 119 (36) 190 (57) 301 (91) 480 (146)
70 40 (12) 64 (19) 102 (31) 163 (49) 258 (78) 411 (125)
80 35 (10) 56 (17) 89 (27) 142 (43) 226 (68) 360 (109)
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 cal-
culated in feet; values in
parentheses are meters.
Table A. Video Coaxial Cable Requirements
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
IN-CEILING MODEL
CAMERA AND LENS INSTALLATION
To install the camera and lens:
1 Extend the lens to the maximum length before
installing in the back box.
2 Attach the camera to the tilt table with the
1/4-20 screw and washers (supplied).
3 To ensure that the lens will not hit the lower dome:
• Place the lower dome over the back box with the
camera and lens installed (do not attach dome).
• If the lens touches the lower dome, adjust the tilt
table assembly.
4 Refer to the manual supplied with the camera and
lens for the following information:
• How to connect power and video wiring
• How to make camera and lens adjustments
NOTE:
The torque applied
to the camera mounting
bracket nut should not
exceed 40 pound-inches.