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> 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 > > > > Sent from my T-Mobile 4G LTE Device > > -------- Original message -------- > From: Frederick G Street via CnC-List <cnc-list@cnc-list.com> > Date: 5/29/16 7:19 PM (GMT-05:00) > To: cnc-list@cnc-list.com > Cc: Frederick G Street <f...@postaudio.net> > Subject: Re: Stus-List Radar power wire > > Danny — RTFM… :^) > > Page 16 of the HD Digital Radome Scanner user’s guide: > >> Grounding >> >> These grounding requirements are applicable for Raymarine equipment supplied >> with a separate drain wire or screen. >> >> • The product power cable drain conductor (screen) must be connected to a >> common ground point. >> >> • It is recommended that the common ground point is a bonded ground, i.e. >> with the ground point connected to battery negative, and situated as close >> as possible to the battery negative terminal. If a bonded ground system is >> not possible, a non-bonded RF ground may be used. > > So tie it with the black wire to the power source (DC breaker). > > > — Fred > > > Fred Street -- Minneapolis > S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > >> On May 29, 2016, at 5:15 PM, Danny Haughey via CnC-List >> <cnc-list@cnc-list.com> wrote: >> >> Hi guys, >> >> I need a little wiring advice. >> >> There are 3 wires for the radar power. >> Red >> Green >> Black >> >> Red to breaker >> Black to ground bar >> Green to ...? >> >> Thanks >> Danny > > _______________________________________________ > > This list is supported by the generous donations of our members. If you like > what we do, please help us pay for our costs by donating. All Contributions > are greatly appreciated!
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