On Sat, 15 Dec 2012 16:00:17 +0000 (UTC),
(Andrew Gabriel) wrote:

I've never found an RCD which failed by taking too long to trip.
Only those that are too sensitive, or don't trip at all.

That's interesting. Perhaps the leakage plug method is not too crude
after all.

My current 30ma RCD always trips at 16ma (15K resistor) and sometimes
trips at 11ma (22K resistor), so it looks like it trips somewhere
between these two values. I realise it should be somewhere between
15ma and 30ma, but I'd like to see something closer to 30 than 15.