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Unknown piece of copper on bottom hull
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Castellino View Drop Down
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    Posted: 22 March 2025 at 18:44
This piece (seems to be made of copper) is mounted at the hull underneath the galley. It is not connected to anything. Does anybody know what the function of this part could be? 

Edited by Castellino - 22 March 2025 at 18:47
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pb1006 View Drop Down
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Points: 14 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pb1006 Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2025 at 19:09
Mass connection for BLU transmiter.
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Wayne's World View Drop Down
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Points: 1434 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2025 at 19:44
Guessing it is/was a grounding plate for a HF/SSB radio. If the radio is no longer onboard you don't need it. 
Wayne W
Cruising, currently in the Pacific until the end of 2026.
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Yoda View Drop Down
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Points: 88 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Yoda Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2025 at 22:39
I have the same. It is a earth grounding plate and connected to the main 12v  negative busbar. 
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Alizee View Drop Down
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Points: 35 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Alizee Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2025 at 11:04
The earthing sponge / plate should not be connected to the negative but to earth. My Hanse has an earthing point and such a plate in round for VHF radio today.
This is for interference suppression of the radio. Not absolutely necessary.
But please don't connect it to minus because then you will get galvanic currents on your boat that you don't want. 
Hanse 370 E from 10/2005 Construction Nr. 023 Paint Baltic Blue Big Carbon Wheel 2 Cabin
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Yoda View Drop Down
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Points: 88 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Yoda Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2025 at 07:12
Alize
The original wiring diagrams clearly show the negative busbar connected to the grounding plate. Mine is as original and I haven't suffered from stray galvanic currents. I don't have any anodes other than on the sail drive leg and this is not connected to anything on the electrical system.
When you say earth do you mean the 240v earth? 
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I believe that is used by the refrigeration unit to dissipate excess heat from the compressor.  There are two on the starboard side hull of our 370.  I also think they run up through the hull so I’m very curious why you aren’t having a bilge leak.  Look under the sink bilge cover to the starboard side under the refrigerator.  There should be a couple of bolts with nuts coming up through the hull. There should be no useless pieces of anything on the hull of your boat!
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Points: 2 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fairwinds Quote  Post ReplyReply Direct Link To This Post Posted: 07 April 2025 at 17:31
Based on prior comments, I’m probably wrong🥴
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Castellino View Drop Down
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Points: 18 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Castellino Quote  Post ReplyReply Direct Link To This Post Posted: 07 April 2025 at 17:47
Thank you all for your comments! 
@Yoda, please can you send me the wiring diagrams by an PM?


Edited by Castellino - 07 April 2025 at 17:48
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Yoda View Drop Down
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Points: 88 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Yoda Quote  Post ReplyReply Direct Link To This Post Posted: 07 April 2025 at 21:57
https://www.wesailhanse.se/370_documents/370_documents_hanse/hanse370_18_370_400_7215-010-02_07042010.pdf
Page 6 is a good place to start and then work back. I'm lucky to have worked on German ships so the language is understandable for me. 

Yoda
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