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[ 10 ] Pelco Manual C2933M (10/05)
Low Voltage Power Supply
Cameras fitted with an automatic-switching low voltage power supply operate at 10.8 to 13.8 VDC (12 VDC
-10% +15%) or 20.4 to 27.6 VAC (24 VAC ±15%) at 50/60Hz. Connections and polarity are indicated adjacent to
the screw terminals on the rear panel.
Refer to Table B for the recommended wire gauge and wiring distances.
CAUTION: AC Operation Only - When wiring more than one camera to the same transformer,
connect the same side of the transformer to the same terminal on all cameras. Failure to connect
all of the cameras the same way will cause the cameras to be out of phase with each other and
may produce a vertical roll when switching between cameras.
Wire Gauge 24 VAC 12 VDC
AWG mm
2
Feet Meters Feet Meters
24 0.25 224 68 56 17
22 0.35 356 108 89 27
20 0.5 567 172 141 42
18 1 902 274 225 68
16 1.5 1432 436 358 109
14 2.5 2285 696 571 174
12 4 3622 1103 905 275
10 6 5760 1755 1440 438
WARNING: When powering the camera via the screw terminals, ensure that the power
connections to the RJ45-10 connector are not used, and that any connections to the RJ45-10 are
not shorted together. The power supply must be a UL Listed Class 2 isolated type.
Table B. Wiring Distances for 5 VA Cameras (24 VAC/12 VDC)
The following are the recommended maximum distances for low voltage cameras. These distances are calculated
with a 10 percent voltage drop. (Ten percent is generally the maximum allowable voltage drop for AC-powered
devices.)
EXAMPLE: A camera that requires 5 VA and is installed 224 feet (68 m) from the transformer would require
a minimum wire gauge of 24 AWG.