9
.1Generalcablingguidance
Cabletypesandlength
Itisimportanttousecablesoftheappropriatetypeandlength.
•UnlessotherwisestatedonlyusecablessuppliedbyRaymarine.
•Whereitisnecessarytousenon-Raymarinecables,ensurethattheyareof
correctqualityandgaugefortheirintendedpurpose.(e.g.:longerpower
cablerunsmayrequirelargerwiregaugestominimizevoltagedropalong
therun).
Cablerouting
Cablesmustberoutedcorrectly,tomaximizeperformanceandprolong
cablelife.
•DoNOTbendcablesexcessively.Whereverpossible,ensureaminimum
benddiameter(Ø)of200mm(7.87in)/minimumbendradius(R)of
100mm(3.94in).
•Protectallcablesfromphysicaldamageande xposuretoheat.Use
trunkingorconduitwherepossible.DoNOTruncablesthroughbilgesor
doorways,orclosetomovingorhotobjects.
•Securecablesinplaceusingcableclipsorcableties.Coilanyexcess
cableandtieitoutoftheway.
•Whereacablepassesthroughanexposedbulkheadordeckhead,use
asuitablewatertightfeed-through.
•DoNOTruncablesneartoenginesorfluorescentlights.
•Alwaysroutedatacablesasfarawayaspossiblefrom:
–Otherequipmentandcables.
–HighcurrentcarryingACandDCpowerlines.
–Antennas.
Strainrelief
Useadequatestrainreliefforcablingtoensurethatconnectorsareprotected
fromstrainandwillnotpulloutunderextremeseaconditions.
Circuitisolation
AppropriatecircuitisolationisrequiredforinstallationsusingbothACand
DCcurrent:
•Alwaysuseisolatingtransformersoraseparatepower-invertertorunPC’s,
processors,displaysandothersensitiveelectronicinstrumentsordevices.
•AlwaysuseanisolatingtransformerwithWeatherFAXaudiocables.
•Alwaysuseanisolatedpowersupplywhenusinga3rdpartyaudio
amplifier.
•AlwaysuseanRS232/NMEAconverterwithopticalisolationonthesignal
lines.
•AlwaysmakesurethatPC’sorothersensitiveelectronicdeviceshave
adedicatedpowercircuit.
Cableshielding
Ensurethatcableshieldingisnotdamagedduringinstallationandthatall
cablesareproperlyshielded.
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