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hi guys just looking for some advice.
Trying to test an a type 100a rcd type a with a megger 1552 and testing on ac the tests pass but on switching to dc on x5 tests it is saying it is over 40ms. Am I missing something? Or would it be a raulty rcd?
 
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hi guys just looking for some advice.
Trying to test an a type 100a rcd type a with a megger 1552 and testing on ac the tests pass but on switching to dc on x5 tests it is saying it is over 40ms. Am I missing something? Or would it be a raulty rcd?

Edit: I don't think the Megger 1552 can test Type A RCDs? (the DC option is for a different type).

I had to upgrade to a 1700 series to get the option to test Type A.

Is it Hager? If so some of them needed to be tested at 250mA I believe, though i think they may have now come back in line with others to avoid confusion.

View: https://www.youtube.com/watch?v=DlDw3JfVFWI
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Edit: I don't think the Megger 1552 can test Type A RCDs? (the DC option is for a different type).

I had to upgrade to a 1700 series to get the option to test Type A.

Is it Hager? If so some of them needed to be tested at 250mA I believe, though i think they may have now come back in line with others to avoid confusion.

View: https://www.youtube.com/watch?v=DlDw3JfVFWI
I can't actually find confirmation either way which type RCD the 1552 can test - seems to be conflicting advice out there. Type A RCDs need to be tested with pulsating DC - but no idea if that is what the 1552 produces.

At the time, I upgraded to a second hand 1711 because of the 2 wire no trip loop test, and it specifically has the option to switch between A and AC types so that's my main tester now.

Still have the 1552 though as it's a reliable workhorse
 
Last edited:
Hi guys it is a contactum 100a type A 30ma rcd. Managed to get it tripping. Was testing at the rcd but with mcbs on. When I turned them off I got trip times. Must not be accurate when a load is on the rcd whilst testing. Was told that the megger 1552 was able to test type a.
 

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