PME is covered with conditions on it's use due to the dangers presented from a lost neutral.
The risk of a dangerous shock or fatality from a lost neutral is far less in the equipotential zone than out 'in the field'.
Remember, a lost service neutral on a PME results in exposed conductive and extraneous parts becoming live to a potential upto that of the supply.
Am I using the correct terminoligy for the 17th.........

A fridge in a wooden shed would certainly present a dangerous risk if it became live, but certainly not as much as if you where stood on mother earth.