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Old 01-20-2016, 09:52 PM   #21
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No, what barnacles, I was over their (through hull) mounting bolts inside the boat.
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Old 01-21-2016, 05:17 AM   #22
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The struts on my sporty are "bonded" to my aluminum tower, for a lightning path. Other than that no underwater metal is "bonded" to any other. I have zinks on my shafts for the simple reason of dissimilar metals. My shaft zinks last a very long time, on the order of over three years. I have ZERO electrolisis, none. I have meticulously "debonded" every boat I have owned, including this one. It works for me, very well. But old habits die hard. Bond away.
As I said, as long as you're fully committed to isolating all your underwater fittings you should be fine.
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Old 01-21-2016, 07:14 AM   #23
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no, what barnacles, i was over their (through hull) mounting bolts inside the boat.
DOH! :d
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Old 01-21-2016, 07:24 AM   #24
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Since the shafts run through rubber cutless bearings, how are they protected?
The shafts on my boat have a piece of spring metal with an electrode that is bonded. Kinda like brushes in a motor.
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Old 01-21-2016, 08:34 AM   #25
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Correct Bill, and allow for lightning protection. Its much simpler than trying to keep up with a bonding system, and as far as I can tell it works better.
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Old 01-21-2016, 04:07 PM   #26
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Actually, partially bonding a boat works quite well to...

Even according to several writers like Calder, etc.

One article I just read...think it was a West Advisor maybe, said that bonding was archaic...but needed for safety rather than corrosion.
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Old 01-21-2016, 06:35 PM   #27
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Actually, partially bonding a boat works quite well to...

Even according to several writers like Calder, etc.

One article I just read...think it was a West Advisor maybe, said that bonding was archaic...but needed for safety rather than corrosion.
I'd like to see the Calder quote. Because he used to say the it was an either or thing. No in between.

At least that is what I recall reading in his book. I'll have to look at it again tonight.
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Old 01-21-2016, 08:00 PM   #28
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May have not been Calder, but if he didnt, it doesn't matter as I have seen it plenty and as I have posted have read other respected marine writers describe it.

By definition, an isolated underwater fitting of good bronze should be unaffected in all but the rare case.

All 3 of my liveaboards have had mixed bonding, isolation with no issues.
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Old 01-22-2016, 05:12 PM   #29
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May have not been Calder, but if he didnt, it doesn't matter as I have seen it plenty and as I have posted have read other respected marine writers describe it.

By definition, an isolated underwater fitting of good bronze should be unaffected in all but the rare case.

All 3 of my liveaboards have had mixed bonding, isolation with no issues.
Hmmm... If you say so. Everything I've always read or been told is that either everything needs to be bonded or nothing.

Because if everything is bonded but one fitting, even if that fitting is bronze, becomes un-bonded that fitting can become like a zinc and leech away over time.
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Old 01-22-2016, 05:26 PM   #30
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Hmmm... If you say so. Everything I've always read or been told is that either everything needs to be bonded or nothing.

Because if everything is bonded but one fitting, even if that fitting is bronze, becomes un-bonded that fitting can become like a zinc and leech away over time.
Without a bonding wire or another metal attached to it ....there is no circuit if the solitary metal is far enough away.


Its the metals that are different and connected together like props and shafts, bronze rudder blades on stainless shafts or all the above in close proximity that has issues.


On page 148 of his second edition Mechanical/electrical...., Calder does make it sound like all fittings should be unbounded...but then goes on to say stainless shafts and bronze props need zincs (plus other setups)...well...at what point does totally unbounded and partially zinced matter? Not much according to my reference cell as long as the isolated bronze thru-hull is far enough away.


I know I should link something up...been on the road with very spotty WIFI.... but I have the reference cell and have been checking boats for years and am just passing along what I have observed, had on my boats and read.
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Old 01-22-2016, 05:58 PM   #31
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Then there is this:

"The one overall compelling reason for bonding together the underwater metals on any boat is for the prevention of electrical shock to the people aboard.

If all the metal fittings, all the appliance and instrument cases, the engine, tanks, and the DC negative are all at the same potential, the hazard from being shocked by a faulty appliance is reduced. That is, provided that the connections were installed correctly, and provided that those connections are maintained."
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Old 01-22-2016, 07:37 PM   #32
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Then there is this:

"The one overall compelling reason for bonding together the underwater metals on any boat is for the prevention of electrical shock to the people aboard.

If all the metal fittings, all the appliance and instrument cases, the engine, tanks, and the DC negative are all at the same potential, the hazard from being shocked by a faulty appliance is reduced. That is, provided that the connections were installed correctly, and provided that those connections are maintained."
True...I did mention the current thinking for bonding is more safety rather than corrosion.

The only joke with bonding EVERY thru hull is ...how the heck is the forward head intake and discharge....not attached to anything but hose for many feet possible going to shock someone?

So all I can say from my experience with bonding is that it is a free-for-all of opinions with a few absolutes and a lot of "????????????????????".
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Old 01-22-2016, 08:06 PM   #33
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I think most of the ??? and confusion comes from the fact that most non electricians dont grasp the concept of "potential" as it applies to electricity.
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Old 01-22-2016, 08:15 PM   #34
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Greetings,
Mr. ps. "...how the heck is the forward head intake and discharge....not attached to anything but hose for many feet possible going to shock someone?"
The very first thing that comes to...er...mind is Taco Bell...

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