24
Copper wire
size (AWG)
Length of
Cable
(Approx.)
#24
(0.22 mm
2
)
20
65
#22
(0.33 mm
2
)
30
100
#20
(0.52 mm
2
)
45
160
#18
(0.83 mm
2
)
75
260
Recommended wire gauge for 24 V AC line.
(m)
(ft)
• Cable Length and Wire Gauge
24 V AC
The recommended cable length and thick-
ness 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.
Copper wire
size (AWG)
Resistance
Ω/m
Resistance
Ω/ft
#24
(0.22 mm
2
)
0.078
0.026
#22
(0.33 mm
2
)
0.050
0.017
#20
(0.52 mm
2
)
0.03
0.010
#18
(0.83 mm
2
)
0.018
0.006
Resistance of copper wire [at 20 °C (68 °F)]
12 V DC
Use the formula below to calculate the power
cable and power supply. The voltage sup-
plied to the power terminals of the camera
should be within 10.5 V DC and 16 V DC.
10.5 V DC ≤VA - 2(R x I x L) ≤16 V DC
L : Cable length (m) (ft)
R : Resistance of copper wire (Ω/m)
(Ω/ft)
VA : DC output voltage of power supply
unit
I : DC current consumption (A). See
specifications.
Note: When using 12 V DC power supply,
the optional heater unit is unavailable.