Power line connection
6.
POWER LINE CONNECTION
Mains connection cables
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.
See figure F. H6/12 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 7.1 MAINS CONNECTION CABLES.
F. H6/12
IT-type distribution 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.
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