Bi directional rcd testing

The way to verify a bidirectional RCD is to 

test with the tripper on the input terminals, while supplying power to the output. 

As well as the conventional 

with the tripper on the output terminals, while supplying power to the input. 

 Maybe something lost in translation in the article, do you have a link to a web copy of it ?

I'm not aware of any move to make this a standard test, rather its something done at the factory.

Mike.

Here is the article.

i know the regs dont require these test as described here : https://www.voltimum.co.uk/news/doepke/does-an-rccb-type-b-trip-on-dc%20?b=&utm_source=ActiveCampaign&utm_medium=email&utm_content=Verify+Type+B+protection+before+faults+strike&utm_campaign=UK_NL_26_230626_OW

im just amazed the rcd works that way or perhaps i misunderstood ?

I think it's as Mike suggested - not only does the instrument have to be connected to the opposite terminals compared to the first test, the supply does too.

I agree that article doesn't make that clear e.g. "Once complete, carry out the same test on the supply side to check the device is true bidirectional." and "Repeat the same test on the opposite side". But then it goes on "If it is truly bi-directional it will trip on DC irrespective of which side, you connect the supply." (In the first I suspect the author says "supply side" in the sense of the side that's conventionally connected to the supply (grid) - rather than the side that happens to be supply power in reverse move (e.g. from a local generator)- of course to test it we'd have to connect some sort of supply, which is probably most conveniently the grid ,.. which mucks up all the conventional assumptions.

If an RCD could trip with a test meter connected to the same side that's fed the actual supply, not only would be understanding of physics be called into question, but any idea of discrimination between circuits would go to the dogs.

   - Andy.

I suspect that the author is confused between type testing and in-service testing.

Generally, tests are performed with a voltage applied to the supply side and no load. I am unclear how this is to be achieved with grid-tied local generation when testing in the "wrong" direction. Perhaps a test-rig is required?

I suspect that the author is confused between type testing and in-service testing.

Generally, tests are performed with a voltage applied to the supply side and no load. I am unclear how this is to be achieved with grid-tied local generation when testing in the "wrong" direction. Perhaps a test-rig is required?