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Old 10-06-2012, 17:55   #1
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Anchor chain conducting DC?

This is a hypothetical question... If an electric windlass has a up and down feature which is done by reversing + and - and lets say your thru-hulls are bonded to the negative DC system, then is is not a subtle short when the anchor is coming up in salt water? The chain makes contact to the windlass which body uses the negative terminal. thought I would throw that out there since I'm working on my anchoring system.
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Old 10-06-2012, 18:28   #2
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Re: Anchor chain conducting DC?

I doubt that the frame of the windlass is bonded to the terminals that are being used to swap + and -.
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Old 10-06-2012, 19:16   #3
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Re: Anchor chain conducting DC?

Having completely disassembled mine for an overhaul I can confirm that the motor in mine is isolated from the body of the windlass.
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Old 10-06-2012, 20:22   #4
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Re: Anchor chain conducting DC?

I'll check it out and report back. At the moment I can see the negative cable attached to the body of the windlass frame.
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Old 17-06-2012, 14:57   #5
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Re: Anchor chain conducting DC?

Quote:
Originally Posted by Celestialsailor View Post
This is a hypothetical question... ...and lets say your thru-hulls are bonded to the negative DC system, then is is not a subtle short when the anchor is coming up in salt water?
Bonding thru hulls or any other bonding should never be connected to the boat DC grounding system.

See: The West Advisor: Marine Grounding Systems

Bonding and grounding are two separate things. Least they should be. If you do it improperly, yes, in your OQ it well could be.
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Old 17-06-2012, 21:50   #6
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Re: Anchor chain conducting DC?

Quote:
Originally Posted by Stu Jackson View Post
Bonding thru hulls or any other bonding should never be connected to the boat DC grounding system.

See: The West Advisor: Marine Grounding Systems

Bonding and grounding are two separate things. Least they should be. If you do it improperly, yes, in your OQ it well could be.
I totally agree...Yet I've read a few books that recommend bonding to the engine block (DC ground). And if you think about it, the prop shaft also is negative.
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