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ContinuousWave: Small Boat Electrical
Alternative Material for Bronze Grounding Plate
|Author||Topic: Alternative Material for Bronze Grounding Plate|
posted 05-18-2009 02:29 PM ET (US)
When I bought my [1985 Boston Whaler OUTRAGE 22] a few years ago, there was a zinc disc in place of the original bronze grounding disc on the transom. Is this an acceptable alternative? The old bronze discs seem hard to come by now.
posted 05-18-2009 02:40 PM ET (US)
I have an one for sale.
posted 05-18-2009 08:22 PM ET (US)
Thanks, Dan. I may have to go that route, and will let you know. Still curious as to whether the zinc does the same job as the bronze though. Anyone else know?
posted 05-18-2009 08:40 PM ET (US)
I don't think they are doing the same thing, the bronze is an excellent electrical conductor, resistant to salt water corrosion, that completes a bonding circuit from the fill nozzle to the tank to the water. Zinc is not a great conductor to complete a circuit and it is sacrifical in that it will corrode away from electrical current instead of metal parts it protects nearby. I would say NO, they don't do the same thing, the price he quoted for the bronze is a good price also! There is a debate about what the bronze does on a trailer boat as it is not hooked to the battery neutral and new boats don't have it.....Jack
posted 05-18-2009 10:04 PM ET (US)
Bronze is a decent conductor and very noble. Zinc is a conductor but much less noble and thus a sacrificial anode most of the time.
The bronze anode or sea plate was intended to establish a ground or link to the sea for the bonding conductors of the fuel system in older Boston Whaler boats.
Some boats have larger bronze plates which are used as part of a radio counterpoise system.
posted 05-19-2009 07:23 AM ET (US)
Thanks jack and jim for the education. Sounds like my curent set up will work, but not nearly as well as the original bronze. I will eventually switch it out. Thanks, again.
posted 05-19-2009 08:56 AM ET (US)
The bronze disc is porous to create more surface area, you can buy the same bronze in bar form, in different sizes, but it is a lot more expensive.
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