Well, there are problems in a power system that could lead to what is described in the article, in particular, phase imbalances in a three phase system with a poor ground (or no ground).
Intersting!
Wouldn’t that mean that the house wiring must be more protected from the magnetic fields?
or am I missing something
There is no ‘leak’ - either you are shorted to ground or not... but any coil within the magnetic field around the wire will generate a current