Simrad EK80 - Basic Cable Requirements; Cable Trays

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394149/C
Basiccablerequirements
Itisveryimportantthatallsystemscablesareinstalledcorrectly.Allcablesmustbe
properlysupportedandprotected,andallrelevantprecautionsmustbemadetoprevent
unwantednoise
Topics
Cabletrays,page138
Radiofrequencyinterference,page139
Physicalprotectionofcables,page139
Groundingofsystemcables,page140
Cableconnectionsandterminations,page140
Cableidentication,page141
Cableglandsandterminationprocedures,page141
Cabletrays
Allpermanentlyinstalledcablesassociatedwiththesystemmustbesupportedandprotected
alongtheirentirelengthsusingconduitsand/orcabletrays.
Theonlyexceptiontothisruleisoverthenalshortdistance(maximum.0,5meters)asthe
cablesrunintothecabinets/unitstowhichtheyareconnected.Theseshortserviceloopsare
toallowthecabinetstomoveontheirshockmounts,andtoallowmaintenanceandrepair.
1Whereverpossible,cabletraysmustbestraight,accessibleandplacedsoastoavoid
possiblecontaminationbycondensationanddrippingliquids(oil,etc.).Theymustbe
installedawayfromsourcesofheat,andmustbeprotectedagainstphysicaldamage.
Suitableshieldsmustbeprovidedwherecablesareinstalledinthevicinityofheat
sources.
2Unlessitisabsolutelyunavoidable,cablesshouldnotbeinstalledacrossthevessel's
expansionjoints.Ifthesituationisunavoidable,aloopofcablehavingalength
proportionaltothepossibleexpansionofthejointmustbeprovided.Theminimum
internalradiusoftheloopmustbeatleasttwelvetimestheexternaldiameterofthe
cable.
3Whereaservicerequiresduplicatesupplylines,thecablesmustfollowseparatepaths
throughthevesselwheneverpossible.
4Signalcablesmustnotbeinstalledinthesamecabletrayorconduitashigh-power
cables.
SimradEK80