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Using a steel conduit to protect the transducer cable
A steel conduit must be used to protect the transducer cable. The steel conduit must
preferably be straight. Start the conduit immediately above the transducer, and terminate
it well above the water line.
It is strongly recommended to lay a steel conduit from the cable gland above the
transducer to the EK80 transceiver, and to pull the transducer cable through this conduit.
The 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 EK80 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
Summary of Contents for Simrad EK80
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