Negative battery goes to the ground buss too. ONE wire from the ground buss to the engine.
Josh Muckley S /V Sea Hawk 1989 C&C 37+ Solomons, MD On Sat, May 30, 2020, 08:12 Brian Davis via CnC-List <cnc-list@cnc-list.com> wrote: > Gotcha. I sent you my diagram. Just want to make sure I'm clear. So the > Grounding bus and the Negative battery both connect to the same engine bolt? > > On Sat, May 30, 2020 at 8:10 AM Joe Della Barba via CnC-List < > cnc-list@cnc-list.com> wrote: > >> You do run a wire to the engine, usually 2 gauge, but only one. Many >> boats ends up using the engine block as a ground bus with wires hooked up >> all over it. >> >> Joe >> On 5/30/2020 8:01 AM, Brian Davis via CnC-List wrote: >> >> Thanks, Joe! >> >> I did get a galvanic isolatot, but forgot to say that. The Blue Sea bus >> link you sent is exactly what i have. But what does that connect to? If not >> the engine then where? >> >> Brian >> >> On Sat, May 30, 2020, 7:53 AM Joe Della Barba via CnC-List < >> cnc-list@cnc-list.com> wrote: >> >>> Don't use the engine for ship's ground. Use one of these: >>> >>> >>> https://www.bluesea.com/products/2127/MaxiBus_250A_BusBar_-_Four_5_16in-18_Studs >>> >>> Your AC ground bus will connect to that ground point as well. Speaking >>> of AC, make sure you have a galvanic isolator. >>> >>> Run ONE ground wire to the engine. You don't want your engine block to >>> be a routine conductor of electricity. >>> >>> Here is your lightning ground conundrum: The old way was to connect all >>> metal together. Coquina came with a ground wire system that connected every >>> single thru-hull, the mast step, the engine and the keel. The problem with >>> that is if the zinc does not work perfectly, you can have electrolysis on a >>> large scale since you have all this metal wired together. I undid all that, >>> no thru-hulls are wired to anything. The mast is wired to a keel bolt with >>> 4 gauge wire. The ship's ground bus is wired to the engine with one ground >>> wire. >>> >>> >>> Joe Coquina >>> On 5/30/2020 7:32 AM, Brian Davis via CnC-List wrote: >>> >>> Hello everyone, >>> >>> Hope you quarantine projects are going well. >>> >>> I have a question about grounding. I'm currently refitting ALL wiring >>> from scratch on our 1980 Landfall 38. I literally gutted every piece of >>> wire and bought all new Ancor tinned marine cables in every guage you can >>> imagine. She's coming along swimmingly, and I've mapped everything out >>> pretty well in a 8 page layered diagram that I'm happy to email direct to >>> anyone who wants it. It's in PowerPoint and about 8mg. >>> >>> My question about Grounding is if it's ok to use my engine as the >>> grounding point? I'm using the similar area for the Negative connection for >>> the 3 battery banks, but a different bolt to the engine case. Several >>> appliances including the breaker panels, ACR, battery charger, water >>> heater, fuel tank, etc require a ground and I'm using a 6 awg green wire >>> from the engine to a large Blue Sea busbar. Then connected the grounds to >>> it. >>> >>> I've also run a 2awg wire from the mast step to the keel bolt and to one >>> of the stanchion bases from underneath for lightning protection. However I >>> kept that all separated and not connected to the grounding. >>> >>> Make sense? Or am I missing something? Again, happy to send my diagram >>> for review. >>> >>> Regards, >>> Brian >>> South FL >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each and >>> every one is greatly appreciated. If you want to support the list - use >>> PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each and >> every one is greatly appreciated. If you want to support the list - use >> PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> > > -- > Brian Davis > 1980 C&C Landfall 38 > "Nina" > Southeast Florida > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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