Note that the Draft copy if have of SANS 10142 says
5.2.5 Point of Generator Connection (PGC)
The Point of Generator Connection (PGC) serves as the point across which a generator is synchronised to the Utility and / or other generators, or where an islanded bus is powered. The PGC serves as the point where the embedded generator(s) disconnect from the rest of the electrical Network.
The PGC cannot be installed downstream to an earth leakage device.