Fagor DDS Series Hardware Manual page 235

TN diagram
Distribution diagram that has a point directly connected to ground and the
conductive parts of the installation are connected to this point through
ground protection conductors. This type of mains admits loads between one
or several phases and the neuter.
There are three kinds of TN diagrams depending on the relative position of
the neuter wire (N) and the protection wire (PE):
TN-S diagram

are different in the entire diagram.
TN-C-S diagram

combined in a single wire (PEN) in part of the diagram.
TN-C diagram

in a single wire (PEN) in the entire diagram.
SECONDARY
WINDING OF THE
LINE TRANSFORMER
OF THE PLANT
F. H6/4
TN-C type distribution diagram.
i
INFORMATION. The DDS system may be connected directly, through a
transformer or auto-transformer in mains with a TN type distribution diagram.
See figure F. H6/4 for properly installing the DDS system with a TN-C type
distribution diagram.
where the neuter wire (N) and the protection wire (PE)
where the neuter and protection functions are
where the neuter and protection functions are combined
DIFFERENTIAL
DIFFERENTIAL
BREAKER BREAKER
MAINS MAINS
FILTER FILTER
DDS DDS
   Power line connection
TN-C diagram
L1
L2
L3
PEN
DIFFERENTIAL
BREAKER
MAINS
FILTER
DDS
HARDWARE
6.
DDS
Ref.1912
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