Simrad ES120-7C - REV D, Руководство по установке, Страница: 68 / 98

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conduit serves two purposes. It will protect the cable, and shield it from electric noise.
Depending on how the steel conduit is terminated over the transducer, it may also secure the
watertight integrity of the vessel.
There are several reasons for this.
• It will make it easier at a later stage to replace the transducer.
• It will protect the cables.
• Noise and interference from other electrical equipment is greatly reduced.
• The risk of flooding is greatly reduced when the steel conduit is terminated above the
water line.
With a steel conduit the installation will satisfy the European Union regulations for
electromagnetic compatibility (EMC) interference. Without a steel conduit, there is a risk of
reduced ES120-7C performance.
Steel conduit quality and shielding
The steel conduit must be unbroken and watertight from the transducer to above the water
line. From there, the cable can be pulled further, or a junction box can be installed to
facilitate further connections.
Note
The steel conduit must act as a continuous electrical screen all the way.
If two or more transducers are installed close to each other it is possible to pull their cables
in the same steel conduit, provided the conduit diameter is increased accordingly. However,
for easy replacement it is recommended that each transducer has its own steel conduit.
Steel conduit minimum dimensions
The dimensions of the steel conduit must be specified and/or verified by the relevant
maritime authority and/or classification society. The minimum dimensions are:
•
Inside diameter
: 35 mm
•
Wall thickness
:
– Galvanized: 4.5 mm
– Not galvanized: 6 mm
Simrad ES120-7C Installation Manual