I remember borrowing 2 radios a Murphy B41 and B40 these were ex marine sets which improved my listening experience no end. However I soon found out that both radios chassis were live to earth i don't know by how much i didn't have an AC voltmeter at that time. I do know that there were no incorrectly wired plugs or sockets i checked carefully also the first time i got a shock the sets were in a temporary location not in there final place in my shack. The estate were i lived then had OH 5 wire distribution all round fed from ground mounted TXs interestingly I found out later that someone who lived the other end of the same estate had a similar problem getting shocks from taps and metal kitchen sink units they were fed from a different TX although I think the neutral on the pole was continuous all the way round what in your opinion mite of been going on? The radios had transformer PSUs so were supposedly isolated internally from the mains
I seem to remember that the 5th wire was thiner looking than the other 4 originally the estate was lit by having a rather puny single bulb in a fancy fitting every few poles but they all got scrapped and replaced with modern concrete columns which had much better brighter lights on icant be sure what type of lights they were all I remember is they were bright white. Getting back to earthing when allthe houses on the estate were rewired about 1980 ish the main earth was to the cold water pipe then a few years later the whole area was PMEd
I seem to remember that the 5th wire was thiner looking than the other 4 originally the estate was lit by having a rather puny single bulb in a fancy fitting every few poles but they all got scrapped and replaced with modern concrete columns which had much better brighter lights on icant be sure what type of lights they were all I remember is they were bright white. Getting back to earthing when allthe houses on the estate were rewired about 1980 ish the main earth was to the cold water pipe then a few years later the whole area was PMEd