In order to keep the voltage drop in the cable as low as possible and to avoid dangerous heating of
the cable, it is necessary to carefully determine the required cable cross-sections. The voltage (V) drop between
current source and consumer must not exceed the following values:
Navigation lights: 5% in 12 V on-board network = 0.60 V Other consumers: 7% in the 12 V on-board
network = 0.84 V
Since the current has an outward and return path through 2 cores, the length of the conductor is always
as long as the cable length. The constant conductance of copper is 56.
Double length (m)
Voltage drop (%)
Voltage drop (V)
Volt (12 V)
Volt (24 V)
Machine room use
You will need:
(due to the maximum current carrying capacity)
(due to the maximum voltage drop)
Cables with this cross section are not available in normal specialised trade.
We recommend a cable with at least
mm² Cross section
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