Permitted voltage supply systems

Voltage supply systems

Permissibility

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. Deactivate the EMC capacitors. 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 efficiency of line filters is severely limited.

Voltage systems with grounded outer conductor.

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