●Cable Length and Wire Gauge
24 V AC
The recommended cable length and thickness are shown in the table for reference. The voltage sup- plied to the power terminals of the camera should be within 19.5 V AC and 28 V AC.
Recommended wire gauge for 24 V AC line.
Copper wire size | #24 | #22 | #20 | #18 | |
(AWG) |
| (0.22 mm2) | (0.33 mm2) | (0.52 mm2) | (0.83 mm2) |
Length of | (m) | 95 | 150 | 255 | 425 |
Cable |
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(Approx.) | (ft) | 314 | 495 | 842 | 1 403 |
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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 10.5 V DC and 16 V DC.
Resistance of copper wire [at 20 °C (68 °F)]
Copper wire size | #24 | #22 | #20 | #18 |
(AWG) | (0.22 mm2) | (0.33 mm2) | (0.52 mm2) | (0.83 mm2) |
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Resistance Ω/m | 0.078 | 0.050 | 0.03 | 0.018 |
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Resistance Ω/ft | 0.026 | 0.017 | 0.010 | 0.006 |
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10.5V 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 specifica- tions.