Unknown piece of copper on bottom hull
Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 370 / 375
Forum Description: 370 / 375 Hints, Tips and News
URL: https://www.myhanse.com/forum_posts.asp?TID=15026
Printed Date: 27 March 2026 at 03:40
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Topic: Unknown piece of copper on bottom hull
Posted By: Castellino
Subject: Unknown piece of copper on bottom hull
Date 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?
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Replies:
Posted By: pb1006
Date Posted: 22 March 2025 at 19:09
| Mass connection for BLU transmiter. |
Posted By: Wayne's World
Date Posted: 22 March 2025 at 19:44
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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. |
Posted By: Yoda
Date 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. |
Posted By: Alizee
Date Posted: 24 March 2025 at 11:04
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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 |
Posted By: Yoda
Date Posted: 25 March 2025 at 07:12
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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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Posted By: Fairwinds
Date Posted: 07 April 2025 at 17:29
| 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! |
Posted By: Fairwinds
Date Posted: 07 April 2025 at 17:31
| Based on prior comments, I’m probably wrong🥴 |
Posted By: Castellino
Date Posted: 07 April 2025 at 17:47
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Thank you all for your comments! @Yoda, please can you send me the wiring diagrams by an PM?
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Posted By: Yoda
Date Posted: 07 April 2025 at 21:57
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https://www.wesailhanse.se/370_documents/370_documents_hanse/hanse370_18_370_400_7215-010-02_07042010.pdf%20" rel="nofollow - 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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Posted By: Captain Cook
Date Posted: 07 April 2025 at 22:06
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https://www.myhanse.com/blue-cable-in-bilge-ac-earth_topic14498_post119756.html?KW=grounding+plate#119756" rel="nofollow - https://www.myhanse.com/blue-cable-in-bilge-ac-earth_topic14498_post119756.html?KW=grounding+plate#119756 Added 13/04/2025: If you consider a SSb/HF radio: uploads/729/When_is_Grounding_Your_Yacht_Ever_Good.pdf" rel="nofollow - uploads/729/When_is_Grounding_Your_Yacht_Ever_Good.pdf
------------- Freya H400 #27 (2006),2-cabin, 40HP 3JH4E, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB) |
Posted By: Castellino
Date Posted: 08 April 2025 at 19:47
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Thank you guys! @ Yoda, I don't know what's going wrong but the link to the wiring diagram doesn't work. I think I didn't found the document you meant as I find only one page. Pls can you check ince again and help me further? Thanks in advance! Grtz, Rene
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Posted By: Yoda
Date Posted: 08 April 2025 at 20:19
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Try going here: https://www.wesailhanse.se/370_manuals.htm and look for:
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Posted By: Castellino
Date Posted: 11 April 2025 at 19:37
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Got him, thx a lot! Grtz, Rene
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