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Old 07-14-2007
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There are two different situations where people discuss "bonding" systems on a boat.

The first situation is when you bond the equipment together for lightning grounding and protection. In this case, the equipment definitely should be grounded to the DC electrical ground. The second is when you bond the underwater metal components for galvanic corrosion protection.

This is a situation where you wouldn't want to ground the "bonded" components to the DC ground, since that would increase the possibility of DC-system related accelerated galvanic erosion.
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