We in the US, usually end up with the same system as the MEN concept. My problem is in the educational and learning process the system conductors are referred to as individual systems, and not as components of only one system.
Defining as one system, individual definitions of each component is not necessary, only its function needs to be known. The identification of its function is done by color marking.
I view a multi grounded neutral system as a single circuit network, it includes all neutrals, ground electrode, bond and equipment ground conductors. At least one conductor, of this system, will connect at every electrical device in a facility.
The points of connection, ampacity, and identification, is dependant on its function.
This is the European approach, which I can understand easier than our multiple definitions, exceptions, references, exclusions, and fine print notes explaining grounding and bonding.
