DC Negative Grounding to grounding plate - Isolated shaft

[svlamorocha]

Originally Posted by exMaggieDrum

The usual setup is bond everything or bond nothing. I.e. don't mix and match.

I am yet to find a good reason for bonding through-hulls.
A good reason not to do it is stray current corrosion.

[a64pilot]

Originally Posted by svlamorocha

I am yet to find a good reason for bonding through-hulls.

A good reason not to do it is stray current corrosion.

You do it to electrically connect them to a sacrificial anode, thereby protecting them.
Of course the theory of leaving them isolated is then they don't need protecting.
If one way were clearly the best way, then of course it would be the only way, but still some are built both ways, So?

But if your not going to inspect and replace the anodes as necessary, then certainly do not bond. But then I'm the guy that hangs a "guppy" anode that is bonded over the side, I remove it to sail of course, and it gets inspected every time it's removed of course. That thing will let me know if something has changed and now I have stray current as it will begin to disappear.

Slip neighbor is a 45" Hatteras, I changed out his Anodes not too long ago, they just crumbled away in my hand when I swam over there and looked. I thought it the neighborly thing to do, He thanked me, but then told me he wasn't worried, he has had those things completely disappear before and nothing was hurt, so he wasn't worried.
I'm watching my Guppie extra close now.


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[svlamorocha]

Originally Posted by a64pilot

You do it to electrically connect them to a sacrificial anode, thereby protecting them.
Of course the theory of leaving them isolated is then they don't need protecting.
If one way were clearly the best way, then of course it would be the only way, but still some are built both ways, So?

Bonding thruhulls has gone out of fashion because when there is strong stray current in the water, zincs will not save you from damage.

IME if you isolate, the metal is of good quality (careful with Euro rubbish valves) and there is no mix of connected metals (careful with the ball in seacocks) everything works fine.

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