Mitch wrote:

What is regarded as the acceptable tolerance for an RCD tripping current?
Let's assume a 30mA RCD.

I've read that the tollerance is that it must trip between 50% and 100% of
the rated value. ( ie it may trip at 15mA and still be in spec ). I
didn't trust the source of that quote too much, so I'd like a second
opinion.

The standard test is 0.5* trip current (at which it must stay closed) and
then at 1* trip current (at which it must trip). Did one yesterday which
went at 24mA (30mA type) which is typical using additional ramp test (i.e.
exactly what current it trips at). So if it tripped at 15mA (0.5I) it would
fail, but 16mA would pass.

Mitch



OK, Thanks for that.

--
Ron