Equipotental bonding means: All exposed metalwork is bonded together and held at the same potential.
Under fault conditions, if for example the voltage on the exposed metal work rises to 55 Volts, then all other exposed metalwork will be at the same potential to avoid a shock between for example two steel workbenches or cabinets.
The equipotential bonding cable has to be of adequate size, say for a 16 mm² mains it has to be 6 mm² for example.
Also the equipotential cable has to be secured at the main Earth bar at the main switchboards in case as with MEN systems used in New Zealand.
Regards Ray
