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Old 07-05-2012, 15:17   #1
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AC bonding via Dynaplate?

I have a Dynaplate installed that is no longer needed (boat came with two ssb's) and was wondering if the AC ground and charger/inverter chassis grounding cable that I currently have connected to the main DC bus bar (per the install instructions) would be better off connected to the Dynaplate? Benefit would be keeping the two systems separate therefore less stray current eating away at my zinc's?
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Old 07-05-2012, 19:57   #2
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Re: AC bonding via Dynaplate?

The ABYC says to bond. 11.5.3.3, .1, .2. Bonding of the AC grounding conductor and the DC negative conductor will reduce stray current. It is also a safety issue. If an AC hot should contact a DC wire it will go to earth and trip your main breaker. If you are having zinc problems it is not because the systems are bonded. I would add the dynaplate to the bonding system as it will corrode just like a prop or thru hull. I'll be back tomorrow for the argument!!
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Old 08-05-2012, 13:51   #3
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Thanks! So it sounds like there would be no benefit. The previous owner wired a mystery black wire to it that I will need to check out... There is no lightning protection system so I really hope he didn't decide that the dynaplate was easier to wire to than a negative post on the battery for an instrument or something.
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Old 11-05-2012, 10:23   #4
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Re: AC bonding via Dynaplate?

Quote:
Originally Posted by Vyndance View Post
The ABYC says to bond. 11.5.3.3, .1, .2. Bonding of the AC grounding conductor and the DC negative conductor will reduce stray current. It is also a safety issue. If an AC hot should contact a DC wire it will go to earth and trip your main breaker. If you are having zinc problems it is not because the systems are bonded. I would add the dynaplate to the bonding system as it will corrode just like a prop or thru hull. I'll be back tomorrow for the argument!!
Actually bonding of the AC grounding conductor and the DC negative conductor is the major cause of stray current. It is via this bond that underwater metal gets connected to shore power ground and CAUSES electrolysis. Unfortunately, as Vyn pointed out, it is a necessary connection for safety.
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Old 12-05-2012, 10:28   #5
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Re: AC bonding via Dynaplate?

Quote:
Originally Posted by Rhythm View Post
Thanks! So it sounds like there would be no benefit. The previous owner wired a mystery black wire to it that I will need to check out... There is no lightning protection system so I really hope he didn't decide that the dynaplate was easier to wire to than a negative post on the battery for an instrument or something.
Yes, that's a common misunderstanding. Bonding and grounds are two separate things.

The West Advisor: Marine Grounding Systems
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