General Cabling Guidance - Raymarine e7 Installation Instructions Manual

3.1 General cabling guidance

Cable types and length
It is important to use cables of the appropriate type and length
• Unless otherwise stated use only standard cables of the correct
type, supplied by Raymarine.
• Ensure that any non-Raymarine cables are of the correct quality
and gauge. For example, longer power cable runs may require
larger wire gauges to minimize voltage drop along the run.
Routing cables
Cables must be routed correctly, to maximize performance and
prolong cable life.
• Do NOT bend cables excessively. Wherever possible, ensure a
minimum bend radius of 100 mm.
Minimum bend
200 mm (8 in)
diameter
• 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 tie-wraps or lacing twine. Coil any
extra 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.
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Minimum bend of cable
100 mm (4 in) radius
Always route data cables as far away as possible from:
• other equipment and cables,
• high current carrying ac and dc power lines,
• antennae.
Strain relief
Ensure adequate strain relief is provided. Protect connectors from
strain and ensure they 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 PC's, processors, displays and other sensitive electronic
instruments or devices.
• Always use an isolating transformer with Weather FAX audio
cables.
• Always use an isolated power supply when using a 3rd party
audio amplifier.
• Always use an RS232/NMEA converter with optical isolation on
the signal lines.
• Always make sure that PC's or other sensitive electronic devices
have a dedicated power circuit.
Cable shielding
Ensure that all data cables are properly shielded that the cable
shielding is intact (e.g. hasn't been scraped off by being squeezed
through a tight area).
e7 / e7D — Installation instructions