Siemens SENTRON - Page 66

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Appendix
A
A.2.1 TN system
All exposed conductive parts in the system must be connected by protective con-
ductors to the grounded point of the supply network, which must be grounded on
or in the vicinity of the associated transformer or generator. The various versions
of TN system are shown in gures A1, A2, and A3.
Figure A1: TN-S system
Figure A2: TN-C-S system