Siemens Model 240 Installation Manual Page 24

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Installing/Mounting
4.2 Electrical Installation
Power Modules PM240
4-6 Hardware Installation Manual, 2006-04-04, A5E00807525B AA
TN-C-S Power System
L1
L2
L3
PEN
L1 L2 L3
N
PE
Exposed Conductive Parts
Figure 4-3 TN-C-S power system
In a TN-C-S power system, the neutral and protective functions are combined in a single part
of the system.
TN-C Power System
L1
L2
L3
PEN
L1 L2 L3
Exposed Conductive Parts
Figure 4-4 TN-C power system
In a TN-C power system, the neutral and protective functions are combined in a single
conductor throughout the system.
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