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18 C3472M-C (9/10)
CABLE LENGTH AND WIRE GAUGE
24 V AC
The voltage supplied to the power terminals of the camera should be within 19.5 V AC and 28 V AC.
12 V DC
Use the formula below to calculate the power cable and power supply. The voltage supplied to the power terminals
of the camera should be within 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). Refer to Specifications on page 25.
Table C. 24 V AC Recommended Cable Length and Thickness
Copper Wire Size (AWG)
#24
(0.22 mm
2
)
#22
(0.33 mm
2
)
#20
(0.52 mm
2
)
#18
(0.83 mm
2
)
Length of Cable (approx.)
(m)
20 30 45 75
Table D. 12 V DC Resistance of Copper Wire (at 20 °C)
Copper Wire Size (AWG)
#24 (0.22 mm
2
) #22 (0.33 mm
2
) #20 (0.52 mm
2
) #18 (0.83 mm
2
)
Resistance Ω/m
0.078 0.050 0.03 0.018