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STEEL CONDUIT
329787/A
Why use steel conduits with a towed body?
It is strongly recommended to lay a steel conduit from the
connection point of the tow cable to the echo sounder transceiver,
and to pull the transducer cable through this conduit. There are
several reasons for this.
• It will make it easier at a later stage to replace the cable.
• Noise and interference from other electrical equipment is
greatly reduced.
With a steel conduit the installation will satisfy the EU
regulations for EMC interference. Without a steel conduit, there
is a risk of reduced echo sounder performance.
Steel conduits qualities 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 that the steel conduit must act as
a continuous electrical screen all the way. To ensure proper
shielding, the conduit must be electrically connected to the echo
sounder transceiver chassis.
Steel conduit dimensions:
• minimum 35 mm inner diameter
• minimum 6 mm wall thickness (4.5 mm if galvanised)
More that one transducer cable?
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
19
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