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Selecting a cable when a long power cable is required
● The input voltage to an indicator is determined by subtracting the voltage drop up
to the power cable from the ship's power supply voltage.
Therefore, if the power cable is too thin or too long, the voltage drops substantially,
preventing the radar from functioning at its full capacity.
guideline for selecting a power cable.
(a) Take the voltage fluctuation rate into consideration when determining a
voltage (Vs) value of the ship's power supply.
(b) Use the following formula for calculating a voltage drop (V).
V=2LRKI
L : Cable length
R : Direct current resistance at 20˚C (Ω/m)
K : Conductor resistance temperature counting (=1.22)
I
: Maximum peak current (A)
(c) Various cable direct current resistances (R) and allowable current (Imax)
Cable type
CVVS2 x 1.25
CVVS2 x 2.0
CVVS2 x 3.5
Provide a sufficient extra current value to Imax when selecting cables.
R (20°C)
(45°C continuously)
16.7 Ω/km
9.42 Ω/km
5.30 Ω/km
128
Use the following
Imax
13A
19A
26a
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