SailNet Community - Reply to Topic
Thread: To bond or not to bond? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

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


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

Email Address:


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.

  Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below

  Topic Review (Newest First)
01-27-2005 01:58 PM
To bond or not to bond?

The boat is sitting in conductive water - how do you expect to isolate (un-bond) it?
Imperfect isolation results in "partial bonding" - why not bond it properly?
01-27-2005 11:45 AM
To bond or not to bond?

Than what you are saying is to unbond evrything, right? If so that was my line of thinking as well. I am planning to use external lightning conductors instead: or somthing similar.

01-26-2005 11:18 AM
To bond or not to bond?

Some folks in our marina recently had a catastorphoc failure of the rigging due to a chainplate that was damaged by a lightning strike a few years back. I''m not sue if it was bonded, (I am trying to find out) but the moral is the official cause of the failure was damage due to the lightning. If your system is already subpar, do you really want to risk bringing that much energy to other parts of the boat? If lightning has the potential to weaken a chainplate in such a way as to render it undetectable, I would not want to be energizing anything else through poor craftmanship.

By the way, the boat is owner by the most attentive of sailors. This failure was not due to his lack of inspecting the rig. I''m sure that if there had been any way to prevent the demasting, he would have done it.
01-24-2005 03:37 PM
To bond or not to bond?

You pretty much described it in the first paragraph: old corroded system, lightning protection is not adequate (I have a ketch and have to take care about grounding two masts!). Plus I already have isolated shaft (flexible coupling) that will help the “un-bonding” process. On another hand I have complication in the form of cooling plate for my Frigoboat fridge.

01-24-2005 10:52 AM
To bond or not to bond?

Interesting thought. What would your objectives be for the "un-bobnding" project? Is there something you are wishing to accomplish that bonding would interfere with? Worried about the horror stories of a lighning strike blowing bonded through hulls clean off the hull? Is the upkeep of your present bonding becoming too costly in respect to it''s stated benefits?

My boat is what you may call "partially bonded" in that some systems are bonded, while others are not. I have all of my electrical, my engine, prop shaft, mast, standing rigging, and steel hull matrix bonded. I also use a galvanic isolator in my shore power circuit.

Things that are not bonded in my boat are life lines, stanchons, seacocks, fuel tank (diesel), water tank, and hydraulics (Navtech backstay and vang). I don''t think it matters but I replaced my 27 year old bronze through hulls (which showed no signs of corrosion or brittleness) with marlon.

I found that once I completed the bonding of the first group of items, along with the galvanic isolator, I started to get better performance from all of my electronics (VHF, GPS, full NEXUS Wind/Speed/Depth/Data, stereo, charger) longer life on my zincs (the isolator is to blame for that) better battery performance as indicated by my LINK 20 Dual Bank Monitor, and less corrosion at the other bonded parts.

Of course, much of the increase in performance may be due to the complete PROPER rewiring of the entire boat at the same time. The previous owners had made a mess of things over the 24 or so years prior to my taking on the project.

In my opinion, there are definate advantages of some things being bonded, while others may be less appearant.
01-24-2005 07:32 AM
To bond or not to bond?

I am considering to “unbond” my boat, remove all bonding between seacocks, chain plates, etc. Any expireance with this project? Can you suggest any literature that describes this subject (except Calder)?


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

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