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IEC voltage range AC DC defining risk
High voltage > 1000 Vrms > 1500 V electrical arcing
Low voltage 50–1000 Vrms 120–1500 V electrical shock
Extra-low voltage < 50 Vrms < 120 V low risk

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

Contents

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

One-phase, three-wire 60 Hz

  • 120 V / 240 V

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