OK. However, I'm a bit confused as to how you can know for sure that it was a lamp blowing that caused the RCD to operate (which would have required you, or someone, to be present when the bulb blew and the RCD operated) without you (or someone) having immediately reset the RCD and therefore avoided any risk to your freezer contents. Was the situation perhaps a little more complicated than you have indicated?
Fair enough - so I suppose one could say that, strictly speaking, you don't know for certain that the RCD operated when the lamp died? (people do report unexplained 'spontaneous nuisance trips' - but you probably don't believe in coincidences). I take it that didn't happen at night - otherwise you would presumably have been in darkness until you reset the RCD!
Yes, that is another possibility from the intellectual barrel, but at least one that could be partially verified, since the 'resistive N-E fault' would be picked up by an IR test. However, the probability of hypotheses which rely on two faults being present is likely to be very low. Furthermore, as I wrote last night, it now sounds as if we may not be totally certain that Risteard's RCD operated at the very moment the lamp/bulb died.
Fair enough - I suppose that's reasonably convincing. As I've said, I'm not doubting that it does happen occasionally - but we can but speculate and hypothesise about possible mechanisms.
Fair enough. As I've just written to Risteard, I'm not doubting that it does happen occasionally - but we can but speculate and hypothesise about possible mechanisms.
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