Re: [Electric Boats] Shore power

 

A shaft brush to the water side would insure good earth ground.  The ideal is to have everything share a common ground voltage.  The reason it is recommended to have all your grounds connected is so that one "ground" does not become high enough that you or someone else becomes the path of least resistance between the two reference grounds.

But that will not save a swimmer out side your boat.  For that you need either ground fault protection or an isolation device on you boat where the AC comes in.   

West Marine sells some cheap-ish Isolators,  though a full isolation transformer would be better at 5 times the price.  Or you could go with a GFCI or ELCI Blue Sea is one company that makes boat versions of these devices

http://www.westmarine.com/webapp/wcs/stores/servlet/SiteSearchView?Ne=2050555&Ns=Most%20Popular|0&beginIndex=0&langId=-1&storeId=11151&page=CategoryDisplayLevel1&N=377+710+2050555&catalogId=10001&pageSize=10&sType=SimpleSearch&viewTaskName=SiteSearchView

http://www.westmarine.com/webapp/wcs/stores/servlet/WestAdvisorView?langId=-1&storeId=11151&page=Whats-A-GFCI#.Uh5vssu9KSM

On Aug 28, 2013, at 12:07 PM, Fred Liesegang <fred4936@yahoo.com> wrote:

 

Thanks to all for the links and info! I will have to do something about a ground! The one thing I'm having trouble understanding is since the prop shaft is isolated (I have a flexable coupling), how can the current get to the water? I certainly do not want to create any sort of shock hazard, I just need to understand what is going on. If i do incorporate a grounding plate of some sort (maybe a thru-hull fitting), then there is ia definite path for the current to go. Is that the idea? 

 

Fred

 

From: Carter Quillen <twowheelinguy@yahoo.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Tuesday, August 27, 2013 11:39 AM
Subject: Re: [Electric Boats] Shore power

 

Fred,

 

Confusing subject with lots of "opinions" when you ask around but I would refer you to a link that was recently offered on this forum.

 

http://www.smartgauge.co.uk/earthing.html

 

It is about the best information resource I have seen on the subject and offers some straight talk with eye opening examples.

 

 

Carter

http://www.shipofimagination.com/

From: fred4936 <fred4936@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, August 27, 2013 7:46 AM
Subject: [Electric Boats] Shore power

Hello Everyone,I'm putting s proper shore power system in my boat, which should make life easier and safer! I read an article from Don Casey about installing shore power systems, and he says to connect the green ground to the engine block. I no longer have an engine block, so that option does not exist. Both the 48v and 12v DC systems are floating, and I was going to make the 120v AC system the same. My prop shaft is also electrically isolated. I was curious as to how others handled this. Thanks to everyone in advance!Fred LiesegangTartan 27-2 "Eagle"------------------------------------Yahoo! Groups Links<*> To visit your group on the web, go to:    http://groups.yahoo.com/group/electricboats/<*> Your email settings:    Individual Email | Traditional<*> To change settings online go to:    http://groups.yahoo.com/group/electricboats/join    (Yahoo! ID required)<*> To change settings via email:    electricboats-digest@yahoogroups.com     electricboats-fullfeatured@yahoogroups.com<*> To unsubscribe from this group, send an email to:    electricboats-unsubscribe@yahoogroups.com<*> Your use of Yahoo! Groups is subject to:    http://docs.yahoo.com/info/terms/

__._,_.___

Reply via web post

Reply to sender

Reply to group

Start a New Topic

Messages in this topic (13)

Recent Activity:

• New Members 11
• New Photos 1

Visit Your Group

Switch to: Text-Only, Daily Digest • Unsubscribe • Terms of Use • Send us Feedback

.

__,_._,___