Isolation Transformer on Mainship 400T

danabbas · Nov 28, 2015

I have a 2005 MS 400T with an isolation transformer. I just read on the Mainship Yahoo group forum that the isolation transformer was installed to send a current when first connected to shore power to test for a ground fault. The problem is that this test current is enough to trip the newer GFCI outlets. Does anyone know the solution to this problem?

caltexflanc · Nov 28, 2015

Then it is not an isolation transformer. It is some sort of galvanic isolator. Two different things. There is a long recent discussion on this at the Trawlers and Trawlering list, entitled "GFCI shore power vs inverter" which gets around to the subject of galvanic isolators.

http://lists.trawlering.com/pipermail/trawlers_lists.trawlering.com/2015-November/subject.html

DavidM · Nov 28, 2015

On my 2006 Mainship 34T, the isolation transformer was installed improperly. The ground on the secondary (the one that serves the house loads) was not connected to the case of the transformer and resulted in an open ground when you plugged in a three prong tester to an outlet.

You may have a similar problem that is causing the ground fault trip on the primary.

David

Isolation Transformer on Mainship 400T

danabbas

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caltexflanc

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DavidM

Valued Technical Contributor

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