Grounding strips - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 13 Old 08-13-2011 Thread Starter
SV Skalliwag #141
 
brokesailor's Avatar
 
Join Date: Jan 2008
Location: Homeport: Solomons, Maryland
Posts: 694
Thanks: 17
Thanked 5 Times in 5 Posts
Rep Power: 8
 
Grounding strips

My boat has this network of copper strips, attached to seacocks etc. What is this associated with? Looking at the grounding plates from the inside of the boat there is nothing hook up to them. The mast ground wire (?) is attached to one of the keel bolts.
Attached Thumbnails
Cable-to-quadrant steering.jpg  
brokesailor is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 13 Old 08-13-2011
Senior Member
 
Join Date: Feb 2010
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
RF ground for an HF SSB radio antenna system.

Eric
fairbank56 is offline  
Quote Quick Reply Share with Facebook
post #3 of 13 Old 08-13-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,502
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Or bonding for protection from electrolysis. Most recommend against bonding now but it was very common in the past.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #4 of 13 Old 08-13-2011
Senior Member
 
Join Date: Jul 2011
Location: marylands eastern shore
Posts: 127
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
 
Grounding

heres some reading material
bandaidmd is offline  
Quote Quick Reply Share with Facebook
post #5 of 13 Old 08-13-2011
Senior Member
 
Join Date: Feb 2010
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Copper strap is a very poor choice for a bonding system if you so choose to have one. Since the copper straps go to the aft section of your boat and aren't connected to anything there, it's likely that there was an HF antenna tuner there at one time that the straps would have been connected to. Bonding is a controversial subject. It's use has to do with managing destructive galvanic and stray currents. The term, "electrolysis", while commonly used, is a misnomer in this regard.

Eric
fairbank56 is offline  
Quote Quick Reply Share with Facebook
post #6 of 13 Old 08-13-2011
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,502
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
The problem with bonding all underwater metal is that seacocks are all of one metal and don't really need protection. In today's marinas with both AC power on boats and shorepower everywhere, not always in good condition, this invites the seacocks into an electrical mix that can cause problems they don't have if not bonded.
The link posted above to an article by Stan Honey explains it very well. Here it is again. Grounding

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #7 of 13 Old 08-13-2011
Senior Member
 
Join Date: Feb 2010
Posts: 134
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Ah, but the water going through that seacock is conductive and therefore a stray current path may very well be provided through that less than desirable "connection". Better to have a good clean solid wired connection than not? There may also be a current path on the inside of the hull because of moisture on the inside of the hull. Not saying I'm for or against bonding but there are pro's and con's to both sides.

Eric
fairbank56 is offline  
Quote Quick Reply Share with Facebook
post #8 of 13 Old 08-13-2011
Senior Member
 
kd3pc's Avatar
 
Join Date: Oct 2006
Location: Callao, VA
Posts: 1,387
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 9
 
most likely a counterpoise for an SSB or Ham radio rig...tape/foil is of no use in bonding for the long term..

YMMV
kd3pc is offline  
Quote Quick Reply Share with Facebook
post #9 of 13 Old 08-13-2011 Thread Starter
SV Skalliwag #141
 
brokesailor's Avatar
 
Join Date: Jan 2008
Location: Homeport: Solomons, Maryland
Posts: 694
Thanks: 17
Thanked 5 Times in 5 Posts
Rep Power: 8
 
I do have an SSB Radio though I have not been able to get it to receive anything. I guess the copper strips go from it up to the thruhulls at the companionway. I guess I need to dive behinfd the engine and do some more scoping out. I am just surprised that nothing is connected to the grounding plates.
brokesailor is offline  
Quote Quick Reply Share with Facebook
post #10 of 13 Old 10-28-2011
Junior Member
 
Join Date: Aug 2010
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
I have just installed a 2" copper tape for my HF radio, and just as I started to make the connection to the thru hull, I noticed a small yellow spark. I mesured the ciurrent and found it to be fluctuating , but seemed to be around .68 volts. I hope someone has a explanation for why this has occured. There is no power going to this tape.
Kwasiemoto is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Grounding Coreyboy18 Electrical Systems 11 05-02-2009 11:21 AM
Effect of grounding. chris_gee Sailboat Design and Construction 14 09-06-2008 06:56 AM
Grounding A/C system dbruce85 Gear & Maintenance 3 03-13-2008 07:55 PM
interior-oak strips evecircleM Gear & Maintenance 2 02-27-2002 07:42 AM
Mast Grounding jmedina General Discussion (sailing related) 3 08-16-2001 01:57 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome