Power line connection
6.
POWER LINE CONNECTION
Ma
ins conn
ecti
on cabl
es
214
Ref.2003
· 214 ·
QC-PDS
HARDWARE
6.7.3
IT diagram
Distribution diagram that has no direct connection to ground and the
conductive parts of the installation are connected to ground
.
With IT-type distribution diagrams, the differential breaker is used
assuming that the capacitance of mains with respect to ground is large
enough to ensure that a minimum fault current flows with the same
magnitude as that of the operating differential current assigned.
Otherwise, its use is not necessary.
for properly installing the QC-PDS system with a IT-type
distribution diagram.
6.8
Mains connection cables
For more information on the mains connection cabling for the QC-PDS
system, see section
.
F. H6/12
IT-type distribution diagram.
IT DIAGRAM
MANDATORY.
With an IT distribution diagram, ALWAYS install the QC-
PDS system to mains through an isolating transformer.
INFORMATION.
Note that with an IT-type distribution diagram, mains can
also be controlled through an isolation watching device. Both protection
measurements are compatible with each other.
i
Содержание QC-PDS
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Страница 80: ...2 POWER SUPPLIES Power supplies 80 Ref 2003 QC PDS HARDWARE...
Страница 138: ...3 DRIVES Drives 138 Ref 2003 QC PDS HARDWARE...
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Страница 302: ...8 INSTALLATION Installation Ref 2003 302 QC PDS HARDWARE...
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Страница 366: ...12 COMMERCIAL MODELS Commercial models Ref 2003 QC PDS HARDWARE 366...
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