Simrad ES38-12 - REV C, Руководство по установке, Страница: 27 / 46

Steel conduit
Steel conduit
Why use steel conduits?
It is strongly recommended to lay a steel conduit from the transducer’s cable gland
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 transducer.
• Noise and interference from other electrical equipment is greatly reduced.
• The risk of flooding is greatly reduced if the pipe is terminate above the water line.
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.
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.
344276/A
25