Hi Peter:
Sea water is a very good conductor, better than soil. Fresh water is an
okay conductor. Pure water is a poor conductor.
The hull of a steel ship is well grounded in the ocean, and reasonably
well grounded in fresh water due to the large contact area with the water.
If the hull is not steel, there usually are enough fittings that the
ship is reasonably well-connected to the water. The propeller and drive
shaft also provide a connection to the water.
I've heard of ship-board hams who will tow a large brass plate for a
good ground for their transmitter.
Commercial AM transmitters try to locate their antennas near a body of
salt water like San Francisco Bay or the Great Salt Lake.
I would guess that a ground pin of a shipboard outlet would be connected
to the hull metal. This gives the same protection from electric shock
as land-based outlets.
See also:
http://electrotechnical-officer.com/primary-methods-of-grounding-and-bonding-on-ship/
Best regards,
Rich
On 7/8/2019 11:19 AM, 000006cee064502d-dmarc-requ...@ieee.org wrote:
Hello group,
Is there a real ground in a ship? i.e if a Class I product is used on
the board of a ship, does the ground pin actually doing anything? The
ship is floating in the ocean and I cannot understand if there is a
real ground there or not? Can you guys educate me please?
Thank you
Peter
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