Raymarine RNS-8, Руководство пользователя, Страница: 26 / 66

8.1 General cabling guidance
Cable types and length
It is important to use cables of the appropriate type and length.
• Unless otherwise stated only use cables supplied by Raymarine.
• Where it is necessary to use non-Raymarine cables, ensure that they are of
correct quality and gauge for their intended purpose. (e.g.: longer power
cable runs may require larger wire gauges to minimize voltage drop along
the run).
Cable routing
Cables must be routed correctly, to maximize performance and prolong
cable life.
• Do NOT bend cables excessively. Wherever possible, ensure a minimum
bend diameter (Ø) of 200 mm (7.87 in) / minimum bend radius (R) of
100 mm (3.94 in).
• Protect all cables from physical damage and exposure to heat. Use
trunking or conduit where possible. Do NOT run cables through bilges or
doorways, or close to moving or hot objects.
• Secure cables in place using cable clips or cable ties. Coil any excess
cable and tie it out of the way.
• Where a cable passes through an exposed bulkhead or deckhead, use
a suitable watertight feed-through.
• Do NOT run cables near to engines or fluorescent lights.
• Always route data cables as far away as possible from:
– Other equipment and cables.
– High current carrying AC and DC power lines.
– Antennas.
Strain relief
Use adequate strain relief for cabling to ensure that connectors are protected
from strain and will not pull out under extreme sea conditions.
Circuit isolation
Appropriate circuit isolation is required for installations using both AC and
DC current:
• Always use isolating transformers or a separate power-inverter to run PCs,
processors, displays and other sensitive electronic instruments or devices.
• If using Weather FAX audio cables, always use an isolating transformer.
• If using a third-party audio amplifier, always use an isolated power supply.
• If using an RS232/NMEA converter, always ensure optical isolation on
the signal lines.
• Always ensure that PCs or other sensitive electronic devices have a
dedicated power circuit.
Cable shielding
Ensure that cable shielding is not damaged during installation and that all
cables are properly shielded.
Suppression ferrites
• Raymarine® cables may be pre-fitted or supplied with suppression ferrites.
These are important for correct EMC performance. If ferrites are supplied
separately to the cables (i.e. not pre-fitted), you must fit the supplied
ferrites, using the supplied instructions.
• If a ferrite has to be removed for any purpose (e.g. installation or
maintenance), it must be replaced in the original position before the
product is used.
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