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That's right. :-/ It is pretty straightforward as I have explained.  A picture will offer nothing new as  I have now given all the information on the board. The main switch (RCD) followed by three MCBs (for the house lights and yes one socket) followed by another RCD, a yellow tester...

Yes, thanks for that post. I do understand that.  However I do have a better idea of what the problem is now.  I was answering Rob_The_rich who was confused.  There is a problem DH with every time I post it shows error messages 'warning'  covering the page and it logs me out... I am also...

I am unclear as to whether the cluster of 3 MCBs and 9 MCBs constitutes the label 'circuits'.  However the confusion seems to have arisen because it appears somewhat unusual for the house lighting MCBs also to contain one socket too...

I don't know if this is the answer you require but it is a CU Electrium part no. b4471/2  The main switch (RCD) does say on it 100a 100mA... Thanks All.

It does say Main switch and also is very clearly marked RCD.   The other one just says RCD.  There is no test button on the "Main switch (RCD)" (This is how it is labelled).  There is a little yellow test button but that only governs the group of 9 MCBs.  Not the first circuit of 3 MCBs and is...

Not qualified to say if it was a numpty electrician, no doubt there are plenty around. However I can confirm this, the first RCD states on it "Main Switch for all circuits" and the second RCD which governs the group of 9 MCBs is somehow interconnected as it trips the MBC on the first circuit...

Thanks Andy.  I accept there can be weird symptoms it seems with insulation probs. .  Also on the 9 breaker board, I think I recall some buzzing on that board when trying to use something - indicative of a short there also?   I don't know if this is universal but I mentioned that there are two...

Why would that socket/lights  with the so called 'melted wiring' be working perfectly then and not trip out the corresponding breaker?

Yes.  But just a lightweight socket.

NS B06-C   Done by a qualified electrician.  Don't think this is the problem at all because it is all working fine, as usual, this circuit. Problem is somewhere in the other circuit of 9 breakers.

How is this fixed, pls? Hi Roys, Sorry dreadful problems posting.  It is logging me out each time too.  Seems ok if I do not hit quote or multiquote. In your example, I guess some insulation tape does the trick.

Agreed.  But it is practical and I am very thankful for it.  Unfortunately though it never was able to hold my dyson hoover ad whilst it will let me use the washing machine from an extention, it will not let me use the tumble drier as it is too much for it. Thanks very much for explaining N/E...

I have  a Consumer unit from electrium part no: b4471/2 (I cant find a pic of it on the internet, sorry). It has the main switch which switches on/off the whole board followed by three switches which are for lights in my home and one socket which work perfectly. Another on/off switch which...