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If you want to know the reasons, I suggest you ring your DNO and ask.
Or Ofgem, as they regulate the DNOs.
Or Ofgem, as they regulate the DNOs.

Other than 'out of curiosity', I have no reason for wanting to know, which is probably just as well, since I would be amazed if I could get a meaningful and sensible answer by calling them!If you want to know the reasons, I suggest you ring your DNO and ask. .... Or Ofgem, as they regulate the DNOs.

I don't think it's quite as simple as that. If, for some crazy reason, they decided that they were only happy for their fuse to be protecting 3m of tails, they could simply say that they were 'only responsible for' the first 3m of the tails. As has been suggested, one can but imagine that they are probably trying to minimise the risk of their fuse operating - but that (tiny) risk will be there regardless of the length of the tails.They just make it easy for themselves and everybody else. ... The DNO declares they are happy enough (all other things being correct) with 3 metres no more (or whatever their own rule is). ... They will accept that as their responsibility, to a degree, and nothing more.
What you've actually written obviously is not correct, since having a downstream fuse which was "the same or higher" in rating than the DNO's fuse would obviously not constitute "fusing down". However, as I've said, an additional silliness is that I've never seen or heard of them trying to enforce a requirement relating to the rating of the customer's downstream fuse - their only 'requirement' seemingly be that there should be 'a fuse'! As I've said, my 80A fuses downstream of their 60A ones is one example!If you want longer tails then you must fuse it down adequately to protect the remainder of the tails and it matters not if your fuse is smaller, bigger, the same as theirs.
We know that and they know that but their blanket 3M and no more gives them an air of superiority about themselves, anyway if the tails are 6m long they are only in anyway if ever at all be held to account for half of it if they can not otherwise wiggle put of it, and yes of course they will wiggle out of anything and prove it was only your bit that caught fire thereby igniting their bit anyway.probably trying to minimise the risk of their fuse operating - but that (tiny) risk will be there regardless of the length of the tails.
But the DNO do not accept responsibility for any part of the instalation after the meter, not even the bit between the meter and the isolator when fitted by the energy provider.We know that and they know that but their blanket 3M and no more gives them an air of superiority about themselves, anyway if the tails are 6m long they are only in anyway if ever at all be held to account for half of it if they can not otherwise wiggle put of it, and yes of course they will wiggle out of anything and prove it was only your bit that caught fire thereby igniting their bit anyway.
They are god in their own heaven for goodness sake.
Do not dream of silliness not coming into it, they make the rules, but you know that John
Stop applying common sense, it will not work!
I do know that, and I've certainly never suggested that there is no silliness involved!They are god in their own heaven for goodness sake. Do not dream of silliness not coming into it, they make the rules, but you know that John
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It works for me, and the attitude I take to the 'rule(s)' in questionStop applying common sense, it will not work!
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