Yup, any time there is access to an independent local earth, or any services that would typically be included in the equipotential zone. With an exported TN-C-S earth, one would also have to export the equipotential zone. That in itself can prove difficult in a practical sense since the size mandated for the main bonding conductor may exceed the CSA of the armour etc on your submain.
Chances are its tiled or has some other flooring which will act as an insulator. Also the premise of PME is that there will be multiple connections to earth on the suppliers PEN conductor, so the rise in voltage ought to be constrained.
There is a section on exporting earths in the outside electrics article:
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