[don't let EFLI catch you writing 'vanishingly improbable'
]
You're the one with the experience, so I suppose I have to accept your view that the occurrence of an L-E fault which is not of 'negligible impedance' can be rendered 'vanishingly improbable' by proper installation and design - even though I find that very surprising (dare I say 'hard to believe'?). If I believed that, I think I would, for example, question the need to undertake routine IR testing, since I would believe that the only faults (other than 'vanishingly improbable' ones) would be those that would invoke ADS!
In any event, is not the point that faults (of any sort) are far more likely to arise in attached (e.g. 'plugged in') equipment than in the installation itself - and, no matter how 'proper' the design and installation of the installation ('fixed wiring'), the designer and installer will have little or no control over that equipment?
Kind Regards, John[/QUOTE
I would agree with John, and i agree with RF ! In a commercial installation , e.g. Stage lighting installation it can be a pain in the ars…….. if you have a blown lamp which takes out a rack of dimmers during the show. By the nature of the installation there is a requirement for rcd protection, as its all portable equipment and quite often has to be unplugged and moved very quickly, often in low light or blackouts.
We have all experienced 'incidents' when we have been very thankful for the rcd !
DS