Power line connection
POWER LINE CONNECTION
Distribution diagrams
6.
Ref.2003
· 213 ·
QC-PDS
HARDWARE
6.7.2 TT diagram
Distribution diagram that has a point directly connected to ground and the
conductive parts of the installation are connected to a ground point
independently from the ground electrode of the power supply system.
See figure F. H6/11 for properly installing the QC-PDS system with a TT-type
distribution diagram.
F. H6/11
TT-type distribution diagrams.
The QC-PDS system is designed to
support phase-chassis voltages
under 300 V AC.
It must be ensured that there is no
voltages over the indicated value if
an isolating transformer is not
installed; i.e. if the QC-PDS system
is connected directly to mains or
through an auto-transformer.
Otherwise, protection elements
must be installed to avoid reaching
excessive voltages.
TT DIAGRAM
MANDATORY. With a CORNER GROUNDED TT-type distribution diagram,
ALWAYS
install an insulation transformer.
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