two rcd's or a single rcd isolation transformer and multiplus

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lyric asked Jun 3, '22

two rcd's or a single rcd isolation transformer and multiplus

Hello

What are the guidelines with RCD's with a mobile (boat) setup that has shore power going thru an isolation transformer and then to a multiplus? Should there be two RCD's installed in this situation (one after the isolation transformer and a second after the multiplus or is a single RCD after the multiplus correct)?

It is also my understanding that a type "A" RCD is not good enough and a "B" type trip rating is needed.

The setup is 230V@50Hz shore and output.

Thanks for your help

wiring Isolation Tranformer

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Answer 1 · 2022-06-03T18:15:54Z

Mike Dorsett answered · Jun 03, 2022 at 06:15 PM

A single RCD after the multiplus should be good enough. With the type A / type B question, the type B will trip on dc current as well as ac - however this is unlikely to be needed in this situation.

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