Simrad SX90 - INSTALLATION REV C - Cable Trays; Dbasic Cable Requirements

SimradSX90
APPENDIXD—BASICCABLEREQUIREMENTS
Thischapterprovidesgeneralinformationrelatedtothe
installationofsystemcables.
Topics
•Cabletraysonpage214
•RadioFrequencyinterferenceonpage215
•Physicalprotectiononpage215
•Groundingonpage216
•Cableconnectionsonpage216
•Cableterminationsonpage216
•Cableidenticationonpage217
Cabletrays
Allpermanentlyinstalledcablesassociatedwiththesystem
mustbesupportedandprotectedalongtheirentirelengthsusing
conduitsand/orcabletrays.Theonlyexceptiontothisruleis
overthenalshortdistance(maximum.0,5meters)asthecables
runintothecabinets/unitstowhichtheyareconnected.These
shortserviceloopsaretoallowthecabinetstomoveontheir
shockmounts,andtoallowmaintenanceandrepair.
•Whereverpossible,cabletraysmustbestraight,accessibleand
placedsoastoavoidpossiblecontaminationbycondensation
anddrippingliquids(oil,etc.).Theymustbeinstalledaway
fromsourcesofheat,andmustbeprotectedagainstphysical
damage.Suitableshieldsmustbeprovidedwherecablesare
installedinthevicinityofheatsources.
•Unlessitisabsolutelyunavoidable,cablesshouldnotbe
installedacrossthevessel’sexpansionjoints.Ifthesituation
isunavoidable,aloopofcablehavingalengthproportional
tothepossibleexpansionofthejointmustbeprovided.The
minimuminternalradiusoftheloopmustbeatleasttwelve
timestheexternaldiameterofthecable.
•Whereaservicerequiresduplicatesupplylines,thecables
mustfollowseparatepathsthroughthevesselwhenever
possible.
•Signalcablesmustnotbeinstalledinthesamecabletrayor
conduitashigh-powercables.
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