4.9.1.2 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.
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JHQHUDWRU
7RWKHV\VWHP
([DPSOH7UDQVIHURI1JURXQGHGQHXWUDO
SRLQW
/
/
/
1
3(
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 lter:
– Operation on TT line systems with grounded neutral point permissible.
– Operation on TT line systems without grounded neutral point not permissible.
• Converter without line lter:
– Operation on all TT line systems permissible.
Installing
4.9Connect the line supply, motor and braking resistor
SINAMICS G120C Converters
66 Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
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