Permitted voltage 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. Unscrew all existing EMC contact screws on all devices. The positions of the EMC contact screws can be found in the product manual > chapter Device structure.
  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.