EV commercial installation

I have just had a look at the fence on Google Earth, I assume it runs around the perimeter from the front gate right around, but stopping short of running across the back of the building with the PV on it, which measures as 154 metres using the measuring tool on Google Earth.

I cannot see any electrical equipment mounted on the fence that could be hardwired to the TN-C-S earth terminal, but assume there is. That already probably makes the fence one of the biggest earth electrodes in the local distribution network, bearing in mind it’s in an industrial estate with lots of steel fences and steel buildings.

Picking up on what Graham said last night, I guess there’s enough of it that it could carry a significant diverted neutral current without an excessive touch voltage being present, for all we know it might already be doing so!

If the steel fence carries on across the back of the building and is fixed to the steel cladding by the air conditioning units it will be effectively within the earthing system of that building, has someone actually bonded the fence to the sir conditioning units thinking someone could touch both at the same time?

I cannot see that installing Open-PEN protection to TT earthed EVSE will achieve anything, but the fence warrants further investigation and consideration.

If the fence really is that good an earth electrode would it actually be better if either everything was TT or TN-C-S, both building and EVSE, other than it is not a dedicated earth electrode?

Edit- it’s probably unlikely but there could be a new gate inserted into the fence or other alterations which would drastically reduce its effectiveness as as earth electrode.

I have just had a look at the fence on Google Earth, I assume it runs around the perimeter from the front gate right around, but stopping short of running across the back of the building with the PV on it, which measures as 154 metres using the measuring tool on Google Earth.

I cannot see any electrical equipment mounted on the fence that could be hardwired to the TN-C-S earth terminal, but assume there is. That already probably makes the fence one of the biggest earth electrodes in the local distribution network, bearing in mind it’s in an industrial estate with lots of steel fences and steel buildings.

Picking up on what Graham said last night, I guess there’s enough of it that it could carry a significant diverted neutral current without an excessive touch voltage being present, for all we know it might already be doing so!

If the steel fence carries on across the back of the building and is fixed to the steel cladding by the air conditioning units it will be effectively within the earthing system of that building, has someone actually bonded the fence to the sir conditioning units thinking someone could touch both at the same time?

I cannot see that installing Open-PEN protection to TT earthed EVSE will achieve anything, but the fence warrants further investigation and consideration.

If the fence really is that good an earth electrode would it actually be better if either everything was TT or TN-C-S, both building and EVSE, other than it is not a dedicated earth electrode?

Edit- it’s probably unlikely but there could be a new gate inserted into the fence or other alterations which would drastically reduce its effectiveness as as earth electrode.