6.6 Electrical installations in hazardous areas
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - 1989 MODU Code – Code for the Construction and Equipment of Mobile Offshore Drilling Units, 1989 – Resolution A.649(16) - Chapter 6 – Machinery and Electrical Installations in Hazardous Areas for all Types of Units - 6.6 Electrical installations in hazardous areas

6.6 Electrical installations in hazardous areas

  6.6.1 Electrical equipment and wiring installed in hazardous areas should be limited to that necessary for operational purposes. Only the cables and types of equipment described in this chapter may be installed.

  6.6.2 Where, in the following, reference is made to certified types of equipment, such equipment should be certified as suitable for the flammable gas/air mixture which may be encountered.

  6.6.3 Cables and types of electrical equipment permitted in hazardous areas are as follows:

  • .1 Zone 0

    Certified intrinsically safe circuits or equipment and associated wiring.

  • .2 Zone 1

    • .2.1 Certified intrinsically safe circuits or equipment and associated wiring .

    • 2.2 Certified flameproof (explosion proof) equipment.

    • .2.3

    Certified increased safety equipment; for increased safety motors, due consideration should be given to the protection against overcurrent.

    • .2.4 Pressurized-enclosure type equipment which is certified safe or which is to the satisfaction of the Administration.

    • .2.5

    Through runs of cables.

  • .3 Zone 2

    • .3.1 Certified instrinsically safe circuits or equipment and associated wiring.

    • .3.2 Certified flameproof (explosion proof) equipment.

    • .3.3 Certified increased safety equipment; for increased safety motors, due consideration should be given to the protection against overcurrent.

    • .3.4 Pressurized-enclosure type equipment which is to the satisfaction of the Administration .

    • .3.5 Any equipment of a type which ensures absence of sparks or arcs and of "hot spots" during normal operation and which is to the satisfaction of the Administration .

    • .3.6 Through runs of cables.

  6.6.4 Permanently installed, fixed cables passing through zone 1 hazardous areas should be fitted with a conductive covering, braiding or sheath for earth detection. Flexible cables passing through such areas should be to the satisfaction of the Administration.

Parent topic: Chapter 6 – Machinery and Electrical Installations in Hazardous Areas for all Types of Units
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