Power line connection
POWER LINE CONNECTION
Types of mains
6.
245
DDS
HARDWARE
Ref.1310
IT type mains
Distribution diagram that has no point connected directly to ground. The
conductive parts of the installation are connected to ground.
In this type of mains, the differential breaker is used assuming that the ca-
pacitance 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 op-
erating differential current assigned. Otherwise, its use is not necessary.
F. H6/6
Installation diagram of an IT type mains.
L1
L2
L3
DDS
L1
L2
L3
DDS
FACTORY LINE
TRANSFORMER
DIFFERENTIAL
BREAKER
MAINS
FILTER
A
FACTORY LINE
TRANSFORMER
DIFFERENTIAL
BREAKER
MAINS
FILTER
A
INFORMATION. Note that an IT type mains can also be controlled
through an isolation watching device. Both protection measurements are
compatible with each other.