Martec folder destroyed by neighbor's electrical problem - SailNet Community
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post #1 of 22 Old 05-25-2013 Thread Starter
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Martec folder destroyed by neighbor's electrical problem

Story is there was a problem with the neighbor's inverter. Running gear on his boat and those to either side of him damaged. This is my client's prop:





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post #2 of 22 Old 05-25-2013
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Re: Martec folder destroyed by neighbor's electrical problem

Was your client's boat also plugged into shore power, or was it "ungrounded"?

Never forget them. Do something to prevent it from happening again.
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post #3 of 22 Old 05-25-2013 Thread Starter
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Re: Martec folder destroyed by neighbor's electrical problem

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Was your client's boat also plugged into shore power, or was it "ungrounded"?
Plugged in.
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post #4 of 22 Old 05-25-2013
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Re: Martec folder destroyed by neighbor's electrical problem

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Plugged in.
Thought so. I keep my boat unplugged and use a solar panel to trickle charge the batteries for fear of just this sort of a problem (not to mention the more general danger of having an unattended 120V/30A circuit surrounded by saltwater). I still occasionally use the shore power, but only when I'm on the boat.

Never forget them. Do something to prevent it from happening again.
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Last edited by SlowButSteady; 05-25-2013 at 12:18 PM. Reason: Can't have chrisncate freaking out over typos
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post #5 of 22 Old 05-25-2013
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Re: Martec folder destroyed by neighbor's electrical problem

Wow! That prop is done! I am guessing they had no zinc? How long did it take for the prop to get that bad? It didn't happen over night!

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post #6 of 22 Old 05-25-2013 Thread Starter
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Re: Martec folder destroyed by neighbor's electrical problem

This will give you an idea of how much metal has actually been lost:

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post #7 of 22 Old 05-25-2013
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Re: Martec folder destroyed by neighbor's electrical problem

Wow. I wondered while someone filed a grove in the side but that is the hole for the cotter pin.

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post #8 of 22 Old 05-25-2013
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Re: Martec folder destroyed by neighbor's electrical problem

Would a galvanic isolator on your customer's boat have saved the prop?

I noticed that my zincs weren't lasting as long as I'd expect, so I added one.

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post #9 of 22 Old 05-25-2013 Thread Starter
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Re: Martec folder destroyed by neighbor's electrical problem

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Would a galvanic isolator on your customer's boat have saved the prop?
Dunno. This is a pretty extreme situation.
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post #10 of 22 Old 05-25-2013
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Re: Martec folder destroyed by neighbor's electrical problem

isolators keep your boat from being some one else's ground if they are putting current into the water

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