Exporting TNC-S Earth

[Engineer54]

So, the euipotential bonding ensures that all exposed conductive parts will remain at the same voltage in the event of a fault; therefore ensuring (within the Equipotential zone) that a person cannot form a potential difference (get a jolt).

However, cannot it be that the act of just standing on a concrete (or wooden, or whatever) floor within the EZ, that the floor itself could provide an earth (PD). Does that mean that within a EZ, the floor is bonded too (i expect re bar of concrete flooring should be). What about wooden floor, or stone floor, are such materials considered to be of a high enough resistance as to not provide a path for fault currents (or PD within a EZ) ?

Surely metalwork going through the floor would make the PD greater

As a matter of interest, do you know the difference between Earthing and Bonding and the reasoning behind the differences??

 

[Gavin A]

However, cannot it be that the act of just standing on a concrete (or wooden, or whatever) floor within the EZ, that the floor itself could provide an earth (PD). Does that mean that within a EZ, the floor is bonded too (i expect re bar of concrete flooring should be). What about wooden floor, or stone floor, are such materials considered to be of a high enough resistance as to not provide a path for fault currents (or PD within a EZ) ?

Surely metalwork going through the floor would make the PD greater

A concrete / wooden floor may well be a extraneous part, but they're not exactly very conductive.