RCD test button ineffective

JohnD said:
the test button has no reliance on an earth.
Er, to coin a phrase, keep up John! :D

might be the test button is faulty, might be the RCD is jammed. they do that sometimes, especially if not tested for a year or more (though your one sounds quite new)
I'll bear this advice in mind for the next time, but with this one it was important that I didn't delve further.
___________

Edit: Oh, Adam_151 already covered it :oops:
Oh b*gger - you spotted it before I did - bah!
 
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Softus said:
Thanks ricicle.

And I realise I posted "30ms" whereas I meant "30mA". :oops:

Oddly enough, they do tend to trip in about 30mS at 30mA.
 

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