Raymarine RAY73 - Page 35

dedicated Powercableextensions adviceprovidedin
theproduct’
sdocumentation.
A
BatteryconnectionscenarioA:suitablefora
vesselwithacommonRFgroundpoint.In
thisscenario ,ifyourproduct’spowercableis
suppliedwithaseparatedrainwirethenitshould
beconnectedtothevessel’scommonground
point.
B
BatteryconnectionscenarioB:suitablefor
avesselwithoutacommongroundingpoint.
Inthiscase ,ifyourproduct’spowercableis
suppliedwithaseparatedrainwirethenitshould
beconnecteddirectlytothebattery’snegative
terminal.
Implementation—connectiontodistributionpanel
•Alternatively ,thesuppliedpowercablemaybe
connectedtoasuitablebreakerorswitchonthe
vessel'sdistributionpanelorfactory-fittedpower
distributionpoint.
•Thedistributionpointshouldbefedfromthevessel’s
primarypowersourceby8AWG(8.36mm
2
)cable.
•Ideally,allequipmentshouldbewiredtoindividual
suitably-ratedthermalbreakersorfuses,with
appropriatecircuitprotection.Wherethisisnot
possibleandmorethan1itemofequipmentsharesa
breaker,useindividualin-linefusesforeachpower
circuittoprovidethenecessaryprotection.
1
P
ositive(+)bar
2
Negative(-)bar
3Circuitbreaker
4Fuse
•Inallcases,observetherecommendedbreaker/fuse
ratingsprovidedintheproduct’sdocumentation.
Important:
Beawarethatthesuitablefuseratingforthethermal
breakerorfuseisdependentonthenumberof
devicesyouareconnecting.
Powercableextension
Ifyouneedtoextendthelengthofthepowercable
suppliedwithyourproduct,ensureyouobservethe
followingadvice:
•Thepowercableforeachunitinyoursystemshould
berunasaseparate,singlelengthof2-wirecable
fromtheunittothevessel'sbatteryordistribution
panel.
•Forpowercableextensions,aminimumwiregauge
of16AWG(1.31mm
2
)isrecommended.Forcableruns
longerthan15meters,youmayneedtoconsidera
thickerwiregauge(e.g.14AWG(2.08mm
2
),or12
AWG(3.31mm
2
)).
•Animportantrequirementforalllengthsofpower
cable(includinganyextension)istoensurethatthere
isacontinuousminimumvoltageattheproduct’s
powerconnectorof10.8Vdc,withafullyflatbattery
at11Vdc.
Important:Beawarethatsomeproductsinyour
system(suchassonarmodules)cancreatevoltage
peak
satcertaintimes,whichmayimpactthevoltage
availabletootherproductsduringthepeaks.
Grounding
Ensurethatyouobserveanyseparategroundingadvice
providedintheproduct’sdocumentation.
Moreinformation
Itisrecommendedthatbestpracticeisobservedinall
vesselelectricalinstallations,asdetailedinthefollowing
standards:
•BMEACodeofPracticeforElectricalandElectronic
InstallationsinBoats
•NMEA0400InstallationStandard
•ABYCE-11AC&DCElectricalSystemsonBoats
•ABYCA-31BatterychargersandInverters
•ABYCTE-4LightningProtection
Cablesandconnections35
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