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Old 01-11-2010, 03:56   #1
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Bonding

I admit that electrical is a weak point for me. but I also understand that bonding is a toss up with many opinions and variations depending on the individual boat.

My boat is bonded. I am in the process of adding a Federal Flexible coupling. the coupling will isolate the engine from the shaft electrically. At present, for the boding system, I have an arm that rides on the shaft to connect the bonding system.

My question is: Since the engine is no longer connected to the shaft electrically, do I still need the bonding system connected to the shaft?

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Old 01-11-2010, 04:57   #2
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Yes. The purpose of bonding is to keep all underwater metal at the same electrical potential. If you remove just one part of that you are putting everything out of balance and basically setting up a cell that can cause currant flow from one unbonded part to the other.
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Old 01-11-2010, 05:09   #3
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From our archives...

Your question has come up before, and generated a lot of discussion. Here are a few links to past threads...

Electrical Bonding of Thru-Hulls, etc.

To bond or not?

Bonding AC & DC Ground

Yikes! Thru-Hull Corrosion!

Electrolysis Bonding Question

In the big "to bond or not to bond" debate, I'm on the "bond" side. It's not based on theory, but simply because my boat had all the through-hulls, engine, and DC ground bonded together with beefy wiring, and I never had a bit of trouble with electrolysis or premature sacrificial anode erosion.
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