Wiring a when the leakage protector in the TN system supplies a three-phase balanced load

The leakage protector in the TN system is used for wiring
    the TN system when the three-phase balanced load is used, that is, the neutral point on the power supply side is directly grounded.
    In the figure, the TN-C system is a three-phase four-wire system in which the working neutral line N and the protective neutral line PE are combined into a PEN line; the TN-S system
neutral line N cannot be connected to the neutral of other equipment or lines without leakage protectors. Line N is shared and is not allowed to be connected to the protective neutral line
PE, equipment metal shells, wire steel pipes and other metal parts connected to the earth . That is to say,
a system with three phase lines, a general neutral line N and a protective neutral line PE (PE is led separately from the neutral point of the transformer) through the leakage system
is also called a five-wire system.

Wiring a when the leakage protector in the TN system supplies a three-phase balanced load