There are some conditions that the neutral earthing resistor  does not guard against - and the grounding to terra firma of any one phase  like that barn in the incident described above

Thinking about it, I reckon it could help even then - provided the chosen resistance was much larger than the source's electrode resistance - which shouldn't be too hard - given that DNOs work to max 20Ω anyway (often <1Ω).

e.g. with a resistance >200Ω  and Rb < 20Ω you shouldn't see PE dragged more than 1/10th of Uo above true Earth, no matter how low the resistance of the fault to Earth.

   - Andy.

I must admit I find the faults described a bit confusing  I can understand that if the neutral is broken then the current goes back via customers earth we had that at a house on the estate I lived on  everything metallic  was at a decidedly painful voltage above earth the DNO came out and sorted a damaged neutral in the meter box  the weird thing was the estate was only converted to PME maybe a year before. What's needed now I think is everytime an EV charger is installed is for the DNO to install a long length of copper pipe in a trench in the street bonded to that customers CNE terminal in the house they can afford it  what do you think?

Kelly Marie Angel said:

What's needed now I think is everytime an EV charger is installed is for the DNO to install a long length of copper pipe in a trench in the street bonded to that customers CNE terminal in the house they can afford it  what do you think?

Come to think of it, when I put in the duct for my service cable, it wouldn't have been difficult to put in a 20 ft length of 15 mm copper pipe, or indeed some form of copper mat. Even better would have been to put something under the 500 sq ft of garage floor, or at the very least to have made a connection to the rebar.

When we wired my daughter-in-law's house, there was a 60 ft trench, let alone their garage floor, which were available.

Hindsight is a wonderful thing, but I think that Kelly Marie Angel makes a very good point.

Kelly Marie Angel said:

What's needed now I think is everytime an EV charger is installed is for the DNO to install a long length of copper pipe in a trench in the street bonded to that customers CNE terminal in the house they can afford it  what do you think?

Come to think of it, when I put in the duct for my service cable, it wouldn't have been difficult to put in a 20 ft length of 15 mm copper pipe, or indeed some form of copper mat. Even better would have been to put something under the 500 sq ft of garage floor, or at the very least to have made a connection to the rebar.

When we wired my daughter-in-law's house, there was a 60 ft trench, let alone their garage floor, which were available.

Hindsight is a wonderful thing, but I think that Kelly Marie Angel makes a very good point.