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Why are you attempting to draw parallels between cable faults - that in most cases would be due to some form of damage - and RCDs which can 'fail' (and failure needs to be defined) simply because they have been inactive for a long period?
As I said, this is a common method of improving reliability in engineering systems - I am not suggested that you have to use it .
As I said, this is a common method of improving reliability in engineering systems - I am not suggested that you have to use it .