Section 6 Electrical equipment
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 2 Machinery and Engineering Systems - Part 4 Propulsion Devices - Chapter 4 Podded Propulsion Units - Section 6 Electrical equipment

Section 6 Electrical equipment

Parent topic: Chapter 4 Podded Propulsion Units

6.1 General

6.1.1 The electrical installation is to be designed, constructed and installed in accordance with the requirements of Vol 2, Pt 9 Electrotechnical Systems.

6.1.2 Means are to be provided to prevent electrical currents flowing across shaft bearings, which may cause their premature failure.

6.1.3 Steering gear electrical systems are to comply with Vol 2, Pt 6, Ch 1, 7 Electrical power circuits and equipment.

6.1.4 Details are to be submitted to demonstrate the suitability of cables and busbars intended to operate at temperatures exceeding 95°C, see Vol 2, Pt 9, Ch 3, 5.2 Busbars 5.2.2 and Vol 2, Pt 9, Ch 3, 8.4 Operating temperature 8.4.3.

6.1.5 Components, including but not limited to control equipment, sensors, slip rings, cable connections and auxiliary drives, are to withstand vibrations in accordance with IEC 60092-501, Electrical installations in ships – Part 501, Special features – Electric propulsion plant, or an alternative relevant International or National Standard or value specified by the Naval Authority.

6.2 Slip rings

6.2.1 Where slip rings are incorporated in the design, the details of the following are to be submitted for consideration:

  1. temperature rise test reports;

  2. maximum permitted temperature ratings and design operating temperatures for materials;

  3. where applicable, arrangements for forced air or liquid cooling;

  4. for data communication link slip rings, evidence to demonstrate compliance with Vol 2, Pt 9, Ch 8, 5.2 Data communication links 5.2.3;

  5. suitability for use under the conditions of vibration expected to arise in normal operation;

  6. evidence of satisfactory operation under the normal angles of inclination given in Vol 2, Pt 9, Ch 1, 2.3 Ambient reference and operating conditions;

  7. cable securing arrangements; and

  8. evidence of electromagnetic compatibility of control, alarm and safety systems with power circuits.

6.2.2 Where forced cooling is used on slip rings, an alarm is to be initiated to indicate the failure of the forced cooling and it is to be possible to operate the slip ring at a reduced power level defined by the manufacturer in the event of failure of the forced cooling.

6.2.3 Slip ring assemblies are to have a minimum ingress protection of IP23, according to IEC60529, Degrees of protection provided by enclosures (IP Code).

6.2.4 Adequate provisions are to be taken to ensure that personnel are not endangered if an arc fault occurs, see also Vol 2, Pt 9, Ch 4, 5 Protection from electric arc hazards within electrical equipment.

6.2.5 Tests at the slip ring assembly manufacturers works are to include type and routine tests according to IEC 60092-501, Electrical installations in ships – Part 501, Special features – Electric propulsion plant.

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