the OP STATED it wasnt TT simply because he had never come across many of them!! WTF sort of way is that to deduce a supply type?
Please read comments on post nineteen. Spoon feeding very basic answers to someone is very rarely a good way for anyone to learn anything. The OP chose not to reply or comment on specific guidance he was given. An electrician competent enough to work on a live consumer unit, should have the ability to understand the concept of how RCD's work and how discrimination of series connected RCD's RCBO's work. There is a vast difference between assisting someone doing a college course and a alleged competent person working on customer sites. In much the same way I would be shocked if members tried to talk a DIYer through a CU change on the forum. A person out of their depth should be turned back to shallower waters before they have accident too deep.
Your statement leads me to think you have missed all of the guidance given in the first 6 posts. The OP is quite clearly out of his depth with no understanding of how discrimination of RCD's work. How relevant earthing types are to protective measures. didn't even know the earthing type? How much help can one give with limited feedback. The forum is not an idiots quick guide to electrical installation. Constructive debate and discussion requires two parties with some similar level of knowledge. Did the OP actually reply to explanations given in post 6, which are far from grilling in my opinion. If you go and look at all of the OP's replies on this thread there was very little feedback to take the discussion anywhere. We can only offer so much advice but if someone decides to ignore it then the forum can do no more.
Unfortunately you are still missing the point that at no stage during the thread has the OP actually acknowledged what he does or doesn't know. As such it is very difficult for any member to advise what the faults are without a clear understanding of what is missing knowledge and what is just typing errors incorrectly explaining a problem. Again with reference to post six a lot of key points are raised the the OP has failed to acknowledge, agree with, disagree with or comment other than "Doh, should have said its either TNS or TNCS, I very rarely see TT!" So does this mean he understands RCD discrimination or not? Another review of the whole thread shows that several members only posted once, I have probably replied the most and some members have a more robust form of reply, but that is not much difference to the sort of replies that any person working in industry may get, it happens in factories every day no doubt. I would hardly call this thread a grilling and as any member has the ability to report any posts or threads they consider inappropriate neither do most of our members. No reports were made about this thread at all.
I have just read this thread, and in my experiance I would say that the OP should not be doing work he is receiving payment for without full understanding of basic electrical knowledge.
Common practice in other parts of the country as well I think.
