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4.1.2
TT line system
In a TT line system, the transformer ground-
ing and the installation grounding are inde-
pendent of one another.
There are TT line supplies where the neutral
conductor N is either transferred – or not.
Note
Operation in IEC or UL systems
For installations in compliance with IEC, operation on TT line systems is permissible. For
installations in compliance with UL, operation on TT line systems is not permissible.
Operating converter on a TT line system
● Converter with integrated or external line filter:
– Operation on TT line systems with grounded neutral point permissible.
– Operation on TT line systems without grounded neutral point not permissible.
● Converter without line filter:
– Operation on all TT line systems permissible.
Power Module PM240P-2
Hardware Installation Manual, 06/2020, A5E37800827C AD
Connecting
4.1 Permissible line supplies
37
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