Rank: Forum user 
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How do we earth equipments on floating vessels, barges or offshore structures? I have heard that the vessel's body itself acts as a zero potential source conduct leakage current. Does it mean that the saline water absorbs the leakage currents? Does it also mean that the saline water gets energized?
I am not that good in physics/ electricity. Some doubts that is errupting and if someone can give me a layman's explanation or some good reading to be done on this, I will be grateful.
Regards,
Pradeep
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Rank: Forum user
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Rank: Super forum user
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Again, not my field, but the links above are primarily aimed at the leisure users. Generally this will mean fibreglass or timber hulls (except in the case of narrowboats). Your original post talks of barges and offshore structures which will, almost certainly, have steel hulls.
Suggest contacting a qualified marine electrician (or marine engineer as their tickets do require a significant electrical element).
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Rank: Super forum user
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As a safety bod I used to witness the loading of methanol from road tanker to ship in the docks and earthing is indeed required for the loading of flammable liquids for example. If you could give further details about the operation I may be able to offer some guidance, or have a look at the following link: http://maritimeknowledge...ity-bonding-and-earthing
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Rank: Super forum user
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Just asked the question - in a major oil terminal, tankers (up to 300,000 tonnes) do not bond to the shore.
There is a degree of bonding from vessel to terminal structure through the seawater and through the rubber fenders (which are impregnated with graphite).
The hoses do have a bonding wire, but the chicksans have a break.
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Rank: Super forum user
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Hi all
I'm an electrical inspector and tester and I think I may be able to help here. If a ship etc has its own generator then the electrical service will be self-contained and not connected in anyway with shore side except perhaps for bonding for electro-Petro-chem (out of my field). However, if a craft moored in a marina then the craft may be linked to shore side via a 230V supply. This supply to the craft will not be PME but should be TT and served by a RCD.
For marina type electrical systems try BS7671:2008 as amended for help. If all else fails...email me if you like.
Zimmy
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