Kongsberg Simrad ES80, Installation Manual

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Physical protection of cables
Cables exposed to the risk of physical damage must be enclosed in a steel conduit or
protected by a metal casing unless the cable's covering (for example armour or sheath) is
sufficient to protect it from the damage risk.
Cables exposed to an exceptional risk of mechanical damage (for example in holds,
storage-spaces and cargo-spaces) must be protected by a suitable casing or conduit, even
when armoured, if the cable covering does not guarantee sufficient protection for the cables.
Metallic materials used for the physical protection of cables must be suitably protected
against corrosion.
Related topics
Basic cable requirements, page 143
Cable layout and interconnections, page 79
Grounding of system cables
All metallic cable coverings (armour, metallic sheathing and other protection) must be
electrically connected to the vessel's hull at both ends except in the case of final sub-circuits
where they should be connected at the supply end only.
Grounding connections should be made using a conductor which has a cross-sectional area
appropriate for the current rating of the cable, or with a metal clamp which grips the metallic
covering of the cable and is bonded to the hull of the vessel. These cable coverings may also
be grounded by means of glands specially intended for this purpose and designed to ensure a
good ground connection. The glands used must be firmly attached to, and in good electrical
contact with, a metal structure grounded in accordance with these recommendations.
Electrical continuity must be ensured along the entire length of all cable coverings,
particularly at joints and splices. In no case should the shielding of cables be used as the
only means of grounding cables or units.
Metallic casings, pipes and conduits must be grounded, and when fitted with joints these
must be mechanically and electrically grounded locally.
Related topics
Basic cable requirements, page 143
Cable layout and interconnections, page 79
Cable layout and interconnections