Two thoughts. First the one I mentioned previously - that by the time the electrical integrity of the sheath is compromised, there surely must be some mechanical breaches that will allow water ingress. Secondly, given that we're presumably talking about old TN-S cables (with limited further life expectancy), they will presumably not have been PMEd - so, by the time one has gone digging to do the PMEing, one might just as well put in new cable?
To which I'd answer "Honestly no idea" The CoP we use is mainly pre-privatisation when the leccy board was very cautious!
Given evidence that other DNO's do this (if your DNO does tell us on here, please) I can raise it with the appropriate people. If for no other reason it could save us a lot of money
Maybe that's true in general, but what about the context? We're talking about a cable whose lead sheath has already failed, certainly electrically and (I would have thought) possibly/probably also mechanically - would you really say that still has a long service life ahead of it?
Maybe I don't understand enough about the construction of PILC cables. I thought that the lead was the only significant barrier to water. If that were the case, if it has lost electrical continuity, there surely must be a path for water ingress (unless sealed with mud, I suppose
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