Pelco DF8 Manuel d'utilisateur télécharger pdf (Page 7)

C2433M-D (9/06) 7

*Cable requirements:

75 ohms impedance

All-copper center conductor

All-copper braided shield with 95% braid coverage

EXAMPLE: An enclosure that requires 30 VA and is installed 94 feet (28 m) from the transformer would require a minimum wire gauge of

20 AWG.

NOTE:

• Models with heaters require 24 VAC for the heater. The heater uses 53 VA. If the camera uses 24 VAC, add the camera power to that of the

heater and refer to Table B to determine the size of wire to use.

• Distances are calculated 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)

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.)

Wire Gauge

20 18 16 14 12 10

Total VA consumed

10 283 (86) 451 (137) 716 (218) 1142 (348) 1811 (551) 2880 (877)

Maximum distance from

transformer to load

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)

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Pelco DF8 Manuel d'utilisateur Page 7