Danny — Tim’s explanation is a good one. But given the short distances you’re dealing with in your setup, it really won’t make much difference.
— Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > On May 30, 2016, at 7:56 AM, Tim Goodyear via CnC-List > <cnc-list@cnc-list.com> wrote: > > Hi Danny, my musings on negative vs screen: > > The negative wire will have current flowing through it to power the radar > and, because of the voltage drop from one end to the other, will not be at > precisely the same potential as it exits the radar as the negative post. The > screen should have very limited current (it is not part of the power circuit) > and therefore should be at the same potential as the negative post. Voltage > drop will depend on the wire size / length and power draw of the appliance. > > Regards, > > Tim > Ex C&C 35-3 > > On May 30, 2016, at 7:38 AM, Danny Haughey via CnC-List > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > >> Thank you Fred. >> >> I'll try to remember to gather all the manuals and bring then along on my >> next trip to the boat. >> >> So, the start battery is quite close, directly under the helm. Would it be >> beneficial to run that green/screen wire directly to the start battery >> negative post? Or is that simply not necessary being that the breaker box >> is already so close to the same battery? >> >> I guess, according to the manual, a direct line to the start battery wild be >> the preferred solution. >> >> my confusion is, If the grounding bars in the panel are already bonded, >> this green"screen" wire seems redundant. What benefit is the added green >> 'screen' wire if it just ties to the same ground post as the black ground >> wire? >> >> Danny
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