Dave — tie the shield to the negative power wire at the power supply lead to the plotter. I’m sure there’s no RF grounding system on most of our boats; you start seeing it on larger vessels or those with SSB installations.
— Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > On Apr 13, 2017, at 6:04 AM, David Knecht via CnC-List > <cnc-list@cnc-list.com> wrote: > > Hi- I am installing a new Raymarine e95 chart plotter and am confused by the > instructions with respect to grounding. The cable includes both a Negative > (black) wire and a black Ground (drain) wire. Here is what the install > manual says: > Grounding — Dedicated drain wire > > The power cable supplied with this product includes a dedicated shield > (drain) wire for connection to a vessel's RF ground point. > > It is important that an effective RF ground is connected to the system. A > single ground point should be used for all equipment. The unit can be > grounded by connecting the shield (drain) wire of the power cable to the > vessel's RF ground point. On vessels without an RF ground system the shield > (drain) wire should be connected directly to the negative battery terminal. > > The dc power system should be either: > > Negative grounded, with the negative battery terminal connected to the > vessel's ground. > Floating, with neither battery terminal connected to the vessel's ground > > > I have never heard of a RF ground point or a drain wire or a floating ground. > I can’t find anything about this in Nigel Calder’s book. Can someone clarify > what this is about and how to wire it? Thanks- Dave > > Aries > 1990 C&C 34+ > New London, CT
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