The PE conductor must have a cross-section of at least 10 mm 2 or must have a second PE connection with a cross-section at least equal to the mains feeder (cf. These conductors conduct fault current due to insulation failure (between a phase conductor and an exposed. Find the grounding bar or PE bar Open the distribution box and find the position marked with the grounding plate or PE letter. Why are the N and PE rails in a household switchboard bridged, and should they be connected if the PEN conductor has already been split at the meter box? The N and PE rails are only bridged at the PEN split point; if the PEN has already been separated upstream, the N and PE rails in the house. The three-phase five-wire system includes three phase wires (A, B, C wires), neutral wire (N wire), and ground wire (PE wire) of three-phase electricity.
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