Section 5 Electrical equipment
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 7 Other Ship Types and Systems - Chapter 7 Burning of Coal in Ships' Boilers - Section 5 Electrical equipment

Section 5 Electrical equipment

Parent topic: Chapter 7 Burning of Coal in Ships' Boilers

5.1 General

5.1.1 All electrical equipment should be situated in positions where it is not exposed to concentration of coal dust. Where this is not practicable, the enclosure of the equipment should be designed and installed such that:

  1. Dust cannot enter the interior of the enclosure. An ingress protection rating of at least l.P. 55 in accordance with IEC Publication 60529, if not of a safe-type, is considered to be acceptable.

  2. Dust will not collect on the surface of the enclosure to such an extent that proper cooling is prevented, thus causing a dangerous rise in temperature.

  3. The maximum surface temperature of the enclosure is not capable of igniting the dust, and should be limited to 165°C for equipment not subjected to overloading and 120°C for equipment such as motors, that may be overloaded.

5.2 Arrangements in coal bunkers

5.2.1 Electrical equipment located within the coal bunkers is to be of a safe-type certified for Group II A atmospheres and temperatures Class T1 in accordance with IEC Publication 60079, Electrical Apparatus for Explosive Atmospheres, or an equivalent National Standard.

5.2.2 The switches and protective devices for such equipment are to interrupt all lines or phases and are to be located outside the coal bunker spaces. Provision is to be made for the complete isolation of these circuits and locking the means of control in the off position.

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