Справочник Пользователя для Pelco C3420M

C3420M (8/06)

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1. Install the mount for the pendant dome. Refer to the instructions supplied with the mount. If the mount is outdoors, 

make sure it is properly sealed to keep moisture out.

2. Open the hinged door to the back box. Push the tab lock towards the wall of the unit and lift the door open. 

Pull wiring into the back box. Refer to Table A, Table B, and Table C for wiring distances.

3. Screw the back box onto the mount. If outdoors, apply thread compound (provided) to the threads on the back box.

NOTE: Thread compound must be applied. Not doing so may prevent the units from being separated in the future.

NOTE: Input power for the dome is 24 VAC or 24 VDC. Using 24 VAC input power, power consumption is 23 VA per dome 
for indoor models and 73 VA for outdoor models. Using 24 VDC input power, power consumption is 0.7 A (15 watts) for 
indoor models and 3 A (65 watts) for outdoor models. 

Use a 24 VAC trasnformer with the following minimum VA:

40 VA per dome

For indoor models (without heater)

100 VA per dome

For outdoor models (with heater)

.

NOTE:  As a minimum, UTP requires Cat5, 100-ohm twisted pair cable

Table C.  UTP  Wiring Distances

Active

(Video Only)

0-3,000 ft

(0-914.4 m)

Passive

(Video, Coaxitron, Pelco V-Sync)

0-750 ft

(0-228.6 m)

.

*Cable requirements:

75 ohms impedance
All-copper center conductor
All-copper braided shield with 95% braid 
coverage

Table A.  Video Coaxial Cable 

Requirements

RG59/U

750 ft (229 m)

RG6/U

1,000 ft (305 m)

RG11/U

1,500 ft (457 m)

Table B.  24 VAC/24VDC Wiring Distances

The following are the recommended maximum distances for 24 VAC 
and 24 VDC applications and are calculated with a 10 percent voltage 
drop. (Ten percent is generally the maximum allowable voltage drop 
for AC- or DC-powered devices.)

23 VA/

15 watts

123 ft

(38 m)

196 ft

(60 m)

311 ft

(95 m)

495 ft

(151 m)

73 VA/

65 watts

39 ft

(12 m)

62 ft

(19 m)

98 ft

(30 m)

156 ft

(48 m)