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Bi directional rcd testing

Newfutile

I just read an article from voltimum where it talks about type B bi directional rcd testing .

it seem to say to test on the outgoing terminals as usual, and then test on the incoming terminals where it should also trip!

I have not fitted many type B and have only done the required test in BS7671 (testing as an AC type).

can anyone confirm this is how they work?

  • 0 in reply to Chris Pearson
    Chris Pearson said:
    Not sure how you get that. For the 40 A device which Newfutile mentioned, there are 1000 mechanical operations; 500 each for test button and test rig = 1000 (presumably these count as electrical cycles); and a further 1000 mechanical. So 2000 mechanical + 1000 electrical.

    Surely the electrical tests are also mechanical tests, as they require manual opening and closing, or manual closing plus test button opening ... still exercises the mechanics.

    So, I get first part of the test (under load), 2000 electrical+mechanical plus second part of the test (mechanical only) 1000 mechanical, totalling 3000 mechanical + 2000 electrical. (apologies for the typo 1000 should have been 2000):

    In BS 61008-1:2012+A12:2017, the current UK designated standard, the total number of cycles tested during type test is 4000 mechanical and 2000 electrical for devices with nominal (load) current rating up to 25 A, and 3000 mechanical and 2000 electrical for devices with nominal (load) current rating exceeding 25 A?

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