Simrad TRANSDUCER - INSTALLATION GENERIC REV H Manuale di Installazione Pagina 202

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SimradMS70
AppendixB
Basiccable
requirements
Thischapterprovidesgeneralinformationrelatedtotheinstallationofsystemcables.
Topics
Cabletraysonpage200
RadioFrequencyinterferenceonpage201
Physicalprotectiononpage201
Groundingonpage202
Cableconnectionsonpage202
Cableterminationsonpage202
Cableidenticationonpage203
Cabletrays
Allpermanentlyinstalledcablesassociatedwiththesystemmustbesupportedand
protectedalongtheirentirelengthsusingconduitsand/orcabletrays.Theonlyexception
tothisruleisoverthenalshortdistance(maximum.0,5meters)asthecablesruninto
thecabinets/unitstowhichtheyareconnected.Theseshortserviceloopsaretoallowthe
cabinetstomoveontheirshockmounts,andtoallowmaintenanceandrepair.
Whereverpossible,cabletraysmustbestraight,accessibleandplacedsoastoavoid
possiblecontaminationbycondensationanddrippingliquids(oil,etc.).Theymustbe
installedawayfromsourcesofheat,andmustbeprotectedagainstphysicaldamage.
Suitableshieldsmustbeprovidedwherecablesareinstalledinthevicinityofheat
sources.
Unlessitisabsolutelyunavoidable,cablesshouldnotbeinstalledacrossthevessel’s
expansionjoints.Ifthesituationisunavoidable,aloopofcablehavingalength
proportionaltothepossibleexpansionofthejointmustbeprovided.Theminimum
internalradiusoftheloopmustbeatleasttwelvetimestheexternaldiameterof
thecable.
Whereaservicerequiresduplicatesupplylines,thecablesmustfollowseparatepaths
throughthevesselwheneverpossible.
200
331549/B
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