Mains Earth Bonding

[Prospero]

I am about to install mains shore power on board and have purchased, inter alia, a shore power inlet fitted with a metal mounting and a Sterling Galvanic Isolator. On the shore power inlet is a sticker "Mounting not grounded, connect green (or bare) grounding wire." In house wiring one simply connects the casing to earth but I have been mulling over what to do for a marine installation. Logic suggests that since the mounting will only be live when connected to the mains supply it should be earthed before the Galvanic Isolator, but is my assumption correct? Any advice will be gratefully received. Many thanks.

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[bruce]

this was covered in PBO in last 2 months, with diagram on basic layout, PBO 421 issue.

<hr width=100% size=1><P ID="edit"><FONT SIZE=-1>Edited by bruce on 23/07/2004 14:20 (server time).</FONT></P>

 

[Prospero]

Sorry Bruce thanks for the tip but the earliest PBO which I have is 437, May 2003
. I regret I still need the advice>

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[bruce]

sorry, i must have got the number wrong, was in either PBO or YM in the may or june issue, appears i have taken the mag home with me. if you check my posts on 'AC' there is something i don't understand, but you might.

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[halcyon]

The galvanic isolator is basically 4 diodes that generates approx a 1.4 volt drop, this is fitted between DC earth/bonding system and mains earth, thus blocking small stray voltages/currents. Therefore all mains earths should be one side, and DC earth's the other. It should explain with the fitting instructions for the galvanic isolator.
More important is fitting a RCD to the input.

Brian

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[Prospero]

Bruce thanks for the input I've tracked the supplement it was Ask the Experts - Your 100 top questions answered" and as you say was with either May or June PBO. It actually deals with the installation of a shore power circuit and earth bonding but doesn't touch on the subject of my query. Marvellous isn't it. My view is similar to that of Halcyon that the metal of the socket should be bonded to the shorepower earth otherwise you effectively cut out the galvanic isolator should there ever be a short circuit to the metal of the socket. The rest of the diagram is as I propose to install the circuits. Many thanks for your help.

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[bruce]

i have a smaller breaker in the boat, that way if there is a problem, the breaker pops in the boat not on the dock, in a down pour rain, snow, cold, hot etc.

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