Three-phase supply network [three-wire network with L1, L2, L3 or four-wire network with L1, L2, L3, N].
The star point of the power generator [transformer] is directly earthed via a functional earth electrode.
The enclosures of the connected electrical equipment are connected with earth electrodes which are independent of the functional earthing, i. e. there is no metallic connection between the earth electrodes and the functional earthing.
