Good resources are MIL-STD-1310H and MIL-STD-1399-300B, I believe... Elyaנשלח
מסמארטפון ה-Samsung Galaxy שלי.
-------- הודעה מקורית --------מאת: Richard Nute <ri...@ieee.org> תאריך:
8.7.2019 15:48 (GMT-05:00) אל: EMC-PSTC@LISTSERV.IEEE.ORG נושא: Re: [PSES]
Ground on ship
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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