When using a star point arrangement S, all metal components of the electronic
system must be suitably insulated against the equipotential bonding network.
A star-shaped arrangement is therefore usually limited to applications in small,
locally confined systems. In such cases, all lines must enter the building or structure,
or a room within the building or structure, at a single point. The star point arrangement
S must be connected to the equipotential bonding network at one single earthing
reference point (ERP) only. This produces the arrangement Ss.
When using the meshed arrangement M, all metal components of the electronic
system do not have to be insulated against the equipotential bonding network. All
metal components shall be integrated into the equipotential bonding network at as
many equipotential bonding points as possible. The resulting arrangement Mm is
used for extended and open systems with many lines between the individual