IEC 60038

International Standard IEC 60038 defines a set of standard voltages for use in low voltage and high voltage AC electricity supply systems.

Low voltage

Where two voltages are given below separated by “/”, the first is the root-mean-square voltage between a phase and the neutral connector, whereas the second is the corresponding root-mean-square voltage between two phases. The three-phase voltages are for use in either four-wire (with neutral) or three-wire (without neutral) systems.

Three-phase 50 Hz

* 230 V / 400 V
* 400 V / 690 V
* 1000 V

Suppliers using 220 V / 380 V or 240 V / 415 V systems were expected by the standard to migrate to the recommended value of 230 V / 400 V by the year 2003. This migration has already been largely completed, as least within the European Union.

Three-phase 60 Hz

* 120 V / 208 V
* 240 V
* 277 V / 480 V
* 480 V
* 347 V / 600 V
* 600 V

External links

* [http://www.electrical-installation.schneider-electric.com/ei-guide/pdf_files/EIG-A-electrical-design.pdf Schneider Electric – Electrical installation guide 2007] – Section 2.1: Definition of voltage ranges