24
Copper wire
size (AWG)
Length of
Cable
(Approx.)
#24
(0.22 mm
2
)
20
66
#22
(0.33 mm
2
)
30
100
#20
(0.52 mm
2
)
45
150
#18
(0.83 mm
2
)
75
250
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
0.024
#22
(0.33 mm
2
)
0.050
0.015
#20
(0.52 mm
2
)
0.03
0.009
#18
(0.83 mm
2
)
0.018
0.005
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.
Important: When using 12 V DC power sup-
ply, the optional heater unit is unavail-
able.