Simrad TRANSDUCER - INSTALLATION GENERIC REV H Manuel d'installation Page 203

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 212
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 202
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
201
Vue de la page 202
1 2 ... 198 199 200 201 202 203 204 205 206 207 208 ... 211 212

Commentaires sur ces manuels

Pas de commentaire