Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-11-2013, 19:30   #331
Registered User
 
transmitterdan's Avatar

Join Date: Oct 2011
Boat: Valiant 42
Posts: 6,008
Re: Isolating Transformers, The Earth wire connection conundrum

Quote:
Originally Posted by chala View Post
It is rare to see a boat connected to shore power with its anchor deployed.
It's not rare in the Mediterranean and probably many places where there isn't room to side tie.
transmitterdan is offline   Reply With Quote
Old 04-11-2013, 20:29   #332
always in motion is the future
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,864
Quote:
Originally Posted by chala View Post
I agree and I would ad: transformer to the list. (This ground protects against failures of the shorepower cord or inlet,) and transformer. Fine Not recommended will defeat the purpose of having an Isolation Transformer. The above is more about galvanic corrosion and as little to do with a correctly wired Isolation Transformer. It is rare to see a boat connected to shore power with its anchor deployed. I have a metal boat in which it would be very difficult to effectively isolate the chain from the metal hull. In the many years that I have been sailing this and a previous metal boat, I never had problem as described above.
It's apparently hard to understand, so let me try again: anchor is buried in the seabed, which is ground, connects to chain which connects to windlass. Now, if windlass is bonded, it connects to a bronze plate which is submerged in the water which is ground. This is the circuit and shore power is not needed for it.

Key to understanding this problem, is that the potential of ground in the seabed is different than the potential of ground at the bronze plate. This is why a current flows and chain is eaten away.

I know it has nothing to do with an IT. Who cares, better remember and make sure it doesn't happen to you too! I have seen two boats with the problem; one had a brand new 12mm stainless steel chain that lost 8mm in 3 weeks!
__________________
“It’s a trap!” - Admiral Ackbar.

s/v Jedi is offline   Reply With Quote
Reply

Tags
rum

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertise Here


All times are GMT -7. The time now is 14:27.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.