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Incidentally, has anyone ever received an elecric shock and tripped the RCD ? What does it feel like ? Does it hurt ? I've never done it.

First time I had it happen, it seemed to take a while to trip...perhaps the current flowing through me was just below the requisite 30mA. The shock was the result of slightly leaky power transformer insulation in a valve radio. I was holding the aerial wire and touching an earthed switch. Strangely, that was 26 years ago and there has been no sign of leakage from that particular radio since.
It felt like the normal kind of shock until it tripped of course. In more recent times the tripping has been so quick that often I'm not even aware that I've caused it. But then I've been right across the live and earth or neutral in those cases. Maybe the modern RCD's are also quicker to respond.

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Aussie, I always change bulbs with the switch on. That way I know straight away if its going to work or not.

OK, I own up to doing that too, more so with fluorescent tubes but in that case I know the switch is on and I'm expecting a handfull of light [Linked Image]. It's when you think the switch off it can be a bit startling.
Good point from Trumpy that's got me thinking twice about changing light bulbs. About two years ago, the one and only light bulb factory in Australia closed down (the usual story of why make them here when we can pay someone a bowl of rice each day to make them somwhere else instead....)
I used to only buy the Aussie bulbs but now we have no choice but to use the imports. It is unbelievable that some of them don't even have the fuses in the stem! I know of at least one case where, because of no internal fuses, a surge on the mains resulted in a pile of broken glass on the dining table beneath.
Given the pressure required to insert a light bulb into a bayonet socket, the thin glass issue is worth keeping in mind.