How to choose the cross-section of marine cables?

I. How to make the selection of marine cable cross section?
1) According to the circuit powered by the cable, estimate the large load current that the cable may carry.
(2) According to the correction factor at different ambient air temperatures, the correction factor for bundled laying and the correction factor for discontinuous work, the pre-selected cable rated current-carrying capacity is corrected, and each cable is corrected, the current quota should not be less than the cable is likely to carry (3) Calibration of the line voltage drop, to ensure that the cable carries a large current under normal operating conditions when the voltage drop does not exceed the value of the relevant norms and rules.
(3) The conductor should have sufficient mechanical strength to meet the laying and working conditions. General single-core cable and double-core cable are selected 1mm2 or 1.5mm2 or more.
(4) three-phase AC power supply system, when the cable cross-section is large (generally limited to 120rnm2), two or more three-core cable can be used in parallel. Parallel use of the cable should have the same impedance, the same cross-section and the same conductor rated temperature, its current-carrying capacity for all the parallel conductor current rated sum. However, only the cross-section equal to or greater than 10rmm2 cable is allowed to be used in parallel.
(5) temporary emergency low-voltage lamps and lanterns, due to the limitations of the size of the stuffing box, the selection of cable cross-section should not exceed 2.5rmm2.
(6) into the battery room of the battery connection line should be selected single-core cable, in order to facilitate the connection.

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