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20 A-Series display - Installation instructions
3.1 General wiring instructions
Cable types and length
Follow the guidelines given in this section to determine appropri-
ate cable types 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 any voltage drop in a cable.
Routing cables
No acute bends. Minimum bend radius of 100mm.
Protect all cables from physical damage and exposure to heat.
Use trunking or conduit where possible. Avoid running 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.
Use a watertight feed-through wherever a cable passes through
an exposed bulkhead or deckhead.
Do not pull cables through a bulkhead or deckhead using a cord
attached to the connector. This could damage the connections.
You should always route data cables:
as far apart from other equipment and cables as possible,
as far away from high current carrying AC and DC power lines
as possible,
as far away from antennas as possible.
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
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 and 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).
D10596-1
Minimum bend of cable
100 mm (4 in) radius
Minimum bend
200 mm (8 in)
diameter
20


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