Types and selection of marine cables

Marine cable, also known as marine power cable, is a type of wire and cable used for power, lighting, and general control of various ships and offshore oil platforms in rivers and seas.

Main application: Used for power, lighting, and general control of various ships in rivers and seas, as well as offshore oil platforms and other water structures. The implementation standards are: IEC60092-350, IEC60092-353 or GB9331-88 for marine power cables. The main parameters of marine power cables include model specifications, number of cores, combustion characteristics, rated voltage, temperature, and nominal cross-sectional area.

According to their usage, marine cables can be classified into the following types:

1. Cables for lighting and power circuits;

2. Cables for control and communication circuits;

3. Telephone circuit cables;

4. Cables for distribution boards;

5. Cables for mobile devices;

6. Cables for internal wiring of control equipment;

7. Other devices use cables.

The selection steps and principles for each cable in the ship's power system are as follows:

1. Select the appropriate cable model based on the purpose, laying location, and working conditions of the cable.

2. Select the appropriate cable cross-section based on the working system of the electrical equipment, the type of power supply, the cable core, and the load current.

3. According to the calculation results of the system short-circuit current, whether the short-circuit capacity of the fragmented cable meets the requirements.

4. Adjust the rated current carrying capacity of the cable based on the ambient temperature, and then determine whether the allowable current of the cable is greater than the load current.

5. According to the bundle laying correction factor, the rated current carrying capacity of the cable is corrected, and then the allowable current of the cable is determined to be greater than the load current.

6. Verify the voltage drop of the circuit and determine if it is less than the specified value.