Simrad TRANSDUCER - INSTALLATION GENERIC REV H Instrukcja Instalacji Strona 203

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AppendixBBasiccablerequirements
Signalcablesmustnotbeinstalledinthesamecabletrayorconduitashigh-power
cables.
Cablescontaininginsulationmaterialswithdifferentmaximum-ratedconductor
temperaturesshouldnotbebunchedtogether(thatis,inacommonclip,gland,conduit
orduct).Whenthisisimpractical,thecablesmustbecarefullyarrangedsuchthatthe
maximumtemperatureexpectedinanycableinthegroupiswithinthespecications
ofthelowest-ratedcable.
Cableswithprotectivecoveringswhichmaydamageothercablesshouldnotbe
groupedwithothercables.
Cableshavingacoppersheathorbraidingmustbeinstalledinsuchawaythat
galvaniccorrosionbycontactwithothermetalsisprevented.
Toallowforfutureexpansionofthesystem,allcablesshouldbeallocatedspare
conductorpairs.Also,spacewithinthevesselshouldbesetasidefortheinstallation
ofextracables.
RadioFrequencyinterference
Allcablesthataretobepermanentlyinstalledwithin9m(30ft)ofanysourceofRadio
Frequency(RF)interferencesuchasatransmitteraerialsystemorradiotransmitters,
must,unlessshieldedbyametaldeckorbulkhead,beadequatelyscreenedbysheathing,
braidingorothersuitablematerial.Insuchasituationexiblecablesshouldbescreened
whereverpossible.
Itisimportantthatcables,otherthanthosesupplyingservicestotheequipmentinstalled
inaradioroom,arenotinstalledthrougharadioroom,highpowerswitchgearorother
potentialsourcesofinterference.Cableswhichmustpassthrougharadioroommust
bescreenedbyacontinuousmetalconduitortrunkingwhichmustbebondedtothe
screeningoftheradioroomatitspointsofentryandexit.
Physicalprotection
Cablesexposedtotheriskofphysicaldamagemustbeenclosedinasteelconduit
orprotectedbyametalcasingunlessthecable’scovering(e.g.armourorsheath)is
sufcienttoprotectitfromthedamagerisk.
Cablesexposedtoanexceptionalriskofmechanicaldamage(forexampleinholds,
storage-spacesandcargo-spaces)mustbeprotectedbyasuitablecasingorconduit,
evenwhenarmoured,ifthecablecoveringdoesnotguaranteesufcientprotection
forthecables.
Metallicmaterialsusedforthephysicalprotectionofcablesmustbesuitablyprotected
againstcorrosion.
331549/B
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