22689403 Iec 60038 Voltage Classifications 4ul3v
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IEC 60038 IEC voltage range
AC
DC
High voltage
> 1000 Vrms
Low voltage
50–1000 Vrms 120–1500 V electrical shock
Extra-low voltage < 50 Vrms
> 1500 V
defining risk
< 120 V
electrical arcing
low risk
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-meansquare 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
AC
DC
High voltage
> 1000 Vrms
Low voltage
50–1000 Vrms 120–1500 V electrical shock
Extra-low voltage < 50 Vrms
> 1500 V
defining risk
< 120 V
electrical arcing
low risk
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-meansquare 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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