Thanks for the great information about GFCI use.
Norm
S/V Bandersnatch
Lying Julington Creek FL
N30 07.68 W081 38.47
----- Original Message -----
From: Jim Lynch
To: [email protected]
Sent: 12/27/2010 7:28:35 PM
Subject: Re: [Liveaboard] GALVANIC ISOLATOR
On 12/27/2010 03:36 PM, ahmet erkan wrote:
>"I did try using a GFCI on the engine room circuit but the environment in the
>ER was too damp and it wouldn't hold.
>I have not tried it elsewhere but I don't know why they wouldn't work.
>Even though the neutral is floating (on my boat), all the non-current carrying
>metal parts are still grounded."
With a "floating Neutral", the GFCI is going to detect a current from hot
terminal through a person to earth and trip
open only if the neutral insulation has also broken down to ground, similarly
GFCI is going to detect a current from
neutral through a person to earth and open only if the hot line insulation has
also broken down to earth. (I believe
Norm has also said this in different words)
If one wants to use GFCI devices with a floating Neutral, I suggest he/she (so
PC) connects a 1uF capacitor from the
hot line to ship's ground and another 1uF capacitor from the neutral to the
ships ground.
....
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