Permitted voltage supply systems

TN and TT systems – voltage systems with directly grounded star point

Use is possible without restrictions.

IT systems – voltage systems with non-grounded star point

Use is only permitted with adherence to the following measures:

1. Only deactivate the EMC capacitors when used in IT systems. For further information, refer to chapter Use in IT systems.
2. Mark this on the nameplate in the "IT system activated" box provided for this purpose.

INFORMATION: The EMC limit values for interference emission are not specified for voltage supply systems without grounded star point (IT systems). The effectiveness of line filters is severely limited.

Voltage systems
with grounded outer conductor

Use only for nominal line voltages up to max. 240 V.