"17 edition"consumer units still being sold.

Andy, why are you picking on TT installations?

Just because it seemed an obvious, fairly common, situation where we are quite dependent on the correct operation of RCDs for safety. As I said in my earlier post the fault might be cleared by large overcurrents on non-TT system so I was just looking for a solution for the remaining problem. Half a solution isn't really a solution after all.

 

I would be most interested to see the data, which is always missing with such arguments.

While I don't entirely disagree about basing decisions on evidence, when things are continually changing (e.g. the nature of loads) I think there is justification for using engineering judgement to anticipate problems too. If we just waited until there was a pile of 100 bodies, the industry would have to explain to 100 families why their loved ones had to perish even though it was "known" that the risks where there and means of prevention might have been available. We might have got away with such an attitude in Victorian times, but I doubt that 21st century culture would be quite so understanding.


   - Andy.

Andy, why are you picking on TT installations?

Just because it seemed an obvious, fairly common, situation where we are quite dependent on the correct operation of RCDs for safety. As I said in my earlier post the fault might be cleared by large overcurrents on non-TT system so I was just looking for a solution for the remaining problem. Half a solution isn't really a solution after all.

 

I would be most interested to see the data, which is always missing with such arguments.

While I don't entirely disagree about basing decisions on evidence, when things are continually changing (e.g. the nature of loads) I think there is justification for using engineering judgement to anticipate problems too. If we just waited until there was a pile of 100 bodies, the industry would have to explain to 100 families why their loved ones had to perish even though it was "known" that the risks where there and means of prevention might have been available. We might have got away with such an attitude in Victorian times, but I doubt that 21st century culture would be quite so understanding.


   - Andy.