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post #19 of Old 05-31-2011
Maine Sail
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Originally Posted by SEMIJim View Post
So is Abracadabra.

Well, yeah. That's pretty typical Those plus fore and aft stays. But Abracadabra has wire running all over the place, bonding all those metal bits together.

Perhaps I misunderstood your point. I didn't mean to suggest that the mast and rigging are part of any circuits, but only that, on many boats, they are "grounded."

And one of the BIGGEST mistakes folks make is to use the bonding/earth potential system as a negative return!!! Don't do it!!!! Sadly this is one thing I see ALL THE TIME.

A well known yacht designer I know said he knew his entire boat inside and out and that his electrical system was perfect. It was, until he found a fuel pump negative return circuit tied to the BONDING system and the reason the bottom paint was all funky and discolored around all of his underwater metals...

The bonding system is not designed to ever carry any current. The mast and shrouds are part of the lightning system and do not need to be "bonded" as underwater metals do.

The biggest problem with most bonding systems is that they rarely work as they are intended to because of terminal corrosion.

Switching of the positive conductor is part of the ABYC standards and a negative switched circuit will or should fail a survey if a competent surveyor is used...

-Maine Sail / CS-36T

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