Kongsberg EM 2040 MKII, Installation Manual

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Steel conduits
In a permanent installation it is recommended to protect the transducer cables with
steel conduits.
All cables must be supported and protected along their entire lengths using conduits
and/or cable trays. The only exception to this rule is over the final short distance
(maximum 0.5 meters) as the cables run into the cabinets/units to which they are
connected. These short service loops are to allow the cabinets to move on their shock
mounts, and to allow maintenance and repair.
The transducer cables are passed through the hull via a steel conduit. The steel conduit is
normally extended until it reaches a minimum of 1000 mm above the waterline. The
top of the conduit has to be sealed off with a watertight cable gland from e.g. Roxtec
or MCT Brattberg.
All cables between the bridge, the various operation- and equipment rooms, must be
supported and protected along their entire length using conduits or cable trays. Note that
the cables must not be installed in the vicinity of high-power supplies and cables, antenna
cables or other possible sources of interference. Kongsberg Maritime recommends that
there are minimal bending of cables from transducers to operating room.
Cables containing insulation materials with different maximum-rated conductor
temperatures should not be bunched together (that is, in a common clip, gland, conduit
or duct). When this is impractical, the cables must be carefully arranged such that the
maximum temperature expected in any cable in the group is within the specifications
of the lowest-rated cable.
Metallic casings, pipes and conduits must be grounded, and when fitted with joints these
must be mechanically and electrically grounded locally.
KONGSBERG EM 2040 MKII Installation Manual