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AppendixDBasiccablerequirements

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.

Grounding

Allmetalliccablecoverings(armour,metallicsheathingetc.)mustbeelectrically

connectedtothevessel'shullatbothendsexceptinthecaseofnalsub-circuitswhere

theyshouldbeconnectedatthesupplyendonly.

Groundingconnectionsshouldbemadeusingaconductorwhichhasacross-sectional

areaappropriateforthecurrentratingofthecable,orwithametalclampwhichgrips

themetalliccoveringofthecableandisbondedtothehullofthevessel.Thesecable

coveringsmayalsobegroundedbymeansofglandsspeciallyintendedforthispurpose

anddesignedtoensureagoodgroundconnection.Theglandsusedmustbermly

attachedto,andingoodelectricalcontactwith,ametalstructuregroundedinaccordance

withtheserecommendations.

Electricalcontinuitymustbeensuredalongtheentirelengthofallcablecoverings,

particularlyatjointsandsplices.Innocaseshouldtheshieldingofcablesbeusedasthe

onlymeansofgroundingcablesorunits.

Metalliccasings,pipesandconduitsmustbegrounded,andwhenttedwithjointsthese

mustbemechanicallyandelectricallygroundedlocally.

381293/A

309

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