Raymarine axiom 7 - Grounding - Additional Dedicated Drain Wire Required

Grounding—additionaldedicateddrainwirerequired
Y ourproductrequiresanadditionaldedicateddrainwire.Thiswiresupplementsthedrainwire
(shield)thatispartoftheproduct’spowercable.
Connectoneendoftheadditionaldrainwire(notsupplied)toyourproduct.
Connecttheotherendoftheadditionaldrainwiretothesamepointasthepowercabledrain
wire(shield).Thiswillbeeitherthevessel'sRFgroundpoint,oronvesselswithoutanRFground
system,thenegativebatteryterminal.
Thedcpowersystemshouldbeeither:
•Negativegrounded,withthenegativebatteryterminalconnectedtothevessel'sground;or
•Floating,withneitherbatteryterminalconnectedtothevessel'sground.
Ifseveralitemsrequiregrounding,theymayfirstbeconnectedtoasinglelocalpoint(e.g.withina
switchpanel),withthispointconnectedviaasingle,appropriately-ratedconductor,tothevessel’s
commonRFgroundpoint.
Implementation
Thepreferredminimumrequirementforthepathtogroundisviaaflattinnedcopperbraid,with
a30Arating(1/4inch)orgreater.Ifthisisnotpossible,anequivalentstrandedwireconductor
maybeused,ratedasfollows:
•forrunsof<1m(3ft),use6mm
2
(#10AWG)orgreater.
•forrunsof>1m(3ft),use8mm
2
(#8AWG)orgreater.
Inanygroundingsystem,alwayskeepthelengthofconnectingbraidorwiresasshortaspossible.
References
•ISO10133/13297
•BMEAcodeofpractice
•NMEA0400
Connections45