16
Important:
• The power supply of 24 V AC/12 V DC shall be insulated against 120 V AC.
• The power supply is automatically switchover either 24 V AC or 12 V DC. No setting is required
with this camera.
Cable length and wire gauge
24 V AC
The recommended cable length and wire gauge are shown in the table for reference. The voltage
supplied to the power terminals of the camera should be within 19.5 V AC and 28 V AC.
The recommended wire size for 24 V AC power cord is shown below:
12 V DC
Calculation of the relation among the cable length, resistance, and power supply.
The voltage supplied to the camera shall be between 10.8 V DC and 16 V DC.
10.8 V DC
≤
V
A
- 2 (R x I x L)
≤
16 V DC
L: Cable length (m)
R: Resistance of copper wire (
Ω
/m)
V
A
: DC output voltage of power supply unit
I: DC current consumption (A)
See specifications.
Resistance of copper wire [at 20 °C {68 °F}]
Copper wire
size (AWG)
#24
(0.205 mm
2
)
#22
(0.325 mm
2
)
#20
(0.519 mm
2
)
#18
(0.833 mm
2
)
#16
(1.307 mm
2
)
Length
(approx.)
(m)
20
30
45
75
120
feet
66
100
150
250
395
Copper wire
size (AWG)
#24
(0.205 mm
2
)
#22
(0.325 mm
2
)
#20
(0.519 mm
2
)
#18
(0.833 mm
2
)
#16
(1.307 mm
2
)
Resistance
Ω
/m
0.083
0.052
0.033
0.020
0.013
