Awesome! Thank you! On Sat, May 30, 2020, 12:36 PM David Castor via CnC-List < cnc-list@cnc-list.com> wrote:
> If you Google “Stan Honey marine grounding systems” you’ll find links to a > couple of versions of a well developed paper on grounding. I’m not an > expert but as a EE I didn’t find anything in it that I disagreed with. I > consider it basically definitive at this point. > > Just FYI > > On Sat, May 30, 2020 at 7:42 AM bwhitmore via CnC-List < > cnc-list@cnc-list.com> wrote: > >> Hello all, >> >> Josh, or Edd, this might be a perfect question for you folks. Where is >> the star ground and the shunt located on our C&C 37/40+ boats? >> >> This is a perfect discussion, as I was having grounding issues of my own >> and the shunt and star ground cannot be found behind the circuit breaker >> panel, nor are they at the batteries, and I don't think I've seen them in >> the engine compartment... >> >> Thanks! >> >> Bruce Whitmore >> 1994 C&C37/40+ >> "Astralis" >> >> >> >> Sent from Samsung tablet. >> >> >> -------- Original message -------- >> From: Dave S via CnC-List <cnc-list@cnc-list.com> >> Date: 5/30/20 10:33 AM (GMT-05:00) >> To: Neil Andersen <neil.eric.ander...@gmail.com> >> Cc: Dave S <syerd...@gmail.com>, cnc-list@cnc-list.com >> Subject: Re: Stus-List Grounding >> >> Feels like a leading (but good) question, lol - and I’d expect the >> ‘grounds’ could be at different potentials and that this delta would vary >> based on the ground at different marinas. >> You’ve made me curious, will measure the ground-to-ground voltage today. >> Not sure of the practical negative (if any) implications of the AC ground >> being at a slightly different potential than the isolated -12vdc ‘ground’? >> I can see that a poor -12vdc ‘ground’ could impact noise suppression in >> cable shielding or similar but otherwise Is there an issue? I’m Not a >> grounding/bonding expert by any means! >> Dave >> >> >> On Sat, May 30, 2020 at 9:56 AM Neil Andersen < >> neil.eric.ander...@gmail.com> wrote: >> >>> Does that set up a different ground potential when connected to shore >>> power (AC side and 12V side)? >>> >>> Neil Andersen >>> Rock Hall, MD 21661 >>> ------------------------------ >>> *From:* Dave S <syerd...@gmail.com> >>> *Sent:* Saturday, May 30, 2020 9:41:36 AM >>> *To:* Neil Andersen <neil.eric.ander...@gmail.com> >>> *Cc:* Brian Davis <brianwdavis...@gmail.com>; cnc-list@cnc-list.com < >>> cnc-list@cnc-list.com> >>> *Subject:* Re: Stus-List Grounding >>> >>> Interesting question. The term ‘ground’ probably should be distinguished >>> from the negative side of the dc circuit. >>> Can’t speak to more sophisticated boats but in my relatively simple 33-2 >>> The AC system is isolated, grounded only when connected to shore power. I >>> do not run any AC loads otherwise, no inverter. >>> The 12v system would ultimately ‘ground’ To the water via the engine, >>> prop and shaft. >>> >>> Dave >>> >>> On Sat, May 30, 2020 at 9:33 AM Neil Andersen < >>> neil.eric.ander...@gmail.com> wrote: >>> >>> Where do you actually go to “ground” off the bus?? >>> >>> Neil Andersen >>> 1982 C&C 32 >>> Rock Hall, MD >>> ------------------------------ >>> *From:* CnC-List <cnc-list-boun...@cnc-list.com> on behalf of Dave S >>> via CnC-List <cnc-list@cnc-list.com> >>> *Sent:* Saturday, May 30, 2020 9:18:24 AM >>> *To:* Brian Davis <brianwdavis...@gmail.com>; C&c Stus List < >>> cnc-list@cnc-list.com> >>> *Cc:* Dave S <syerd...@gmail.com> >>> *Subject:* Re: Stus-List Grounding >>> >>> Essentially yes, however when you are thinking of the boat's wiring, I >>> would think of the ground bus as the centre, with the engine connected to >>> it, rather than the reverse. Think of it a hub or a star - with the >>> ground bus at the centre. (Google "star grounding") one of those paths >>> has to finally cross the shunt to be measured. (those loads which are >>> powered by the house bank) >>> >>> That green wire is the ground for the aluminum fuel tank. The rest are >>> batteries (house 1,2, and start) or engine, plus the shunt. All are at >>> the same ground potential. On the other side of the shunt is >>> the smartcharger, the refrigeration unit, the house breaker panel, and >>> anything else I want to "see" in the BMV 700. Basically anything that >>> impacts the house bank, (though this does not include the alternator.) >>> >>> Dave >>> >>> >>> >>> On Sat, 30 May 2020 at 08:43, Brian Davis <brianwdavis...@gmail.com> >>> wrote: >>> >>> Thanks, Dave. I have the same type of shunt that came with the Blue Sea >>> panels I'm installing and will have the same monitoring. I see in you pic >>> there's a green wire (grounding?) going to the bus along with the blacks >>> (negative batteries). So, all of that goes to the same engine connecting >>> point and the grounds and negatives share that single point? Just want to >>> make sure I completely "get it". >>> >>> Thanks for all your guys help. >>> >>> On Sat, May 30, 2020 at 8:21 AM Dave S <syerd...@gmail.com> wrote: >>> >>> Agree with Joe's comment. the engine must be grounded but should not >>> be used as your primary grounding point. >>> there are a buncha' good reasons for this. Another thing to consider is >>> providing for an upgrade the battery/power monitoring, for which you may >>> need to install a resistive shunt between the battery and the various >>> grounds you wish to monitor, Here's a photo of the shunt (on the >>> right) and ground bus (left) in my 33-2, you can see the ground bus and >>> various grounds attached, this bus is connected to one side of the shunt, >>> the other side of which is connected to the house breaker panel and the >>> other accessories that are measured by my battery/power consumption >>> monitor. This is the shunt that victron provides with the BMV-700. >>> >>> >>> https://3.bp.blogspot.com/-LeNHHo5kK2k/V5V0MaFJ_cI/AAAAAAAAAkc/VI_Cm3z-Aa0m_dZ9AmlgaeVdXmXQOINkgCLcB/s1600/blog%2Bgrounding%2B2.jpg >>> >>> >>> >>> Dave >>> >>> >>> >>> >>> >>> >>> >>> -- Forwarded message ---------- >>> From: Brian Davis <brianwdavis...@gmail.com> >>> To: cnc-list@cnc-list.com >>> Cc: >>> Bcc: >>> Date: Sat, 30 May 2020 07:32:16 -0400 >>> Subject: Stus-List Grounding >>> 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 >>> >>> >>> >>> ---------- Forwarded message ---------- >>> From: Joe Della Barba <j...@dellabarba.com> >>> To: cnc-list@cnc-list.com >>> Cc: >>> Bcc: >>> Date: Sat, 30 May 2020 07:52:37 -0400 >>> Subject: Re: Stus-List Grounding >>> >>> 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 >>> >>> _______________________________________________ >>> CnC-List mailing list >>> CnC-List@cnc-list.com >>> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >>> >>> >>> >>> >>> -- >>> 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 >> >> -- > Excuse the brevity. Sent from my phone. > _______________________________________________ > > 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
