Iec 60038 Standard Voltages Pdf 103 Link -

IEC 60038 is the primary international standard for voltage levels in electrical supply systems. It defines preferential values for nominal voltages used in alternating current (AC) and direct current (DC) transmission, distribution, and utilization. Standard Voltage Categories

  • System nominal voltage (Un): 10 kV, 20 kV, 35 kV
  • Highest voltage for equipment (Um): 12 kV, 24 kV, 40.5 kV respectively
  • Page 103 may include footnotes about system earthing or specific national deviations (e.g., North American 13.8 kV, 34.5 kV).
  • Low voltage: 230/400 V (with tolerances of +10% to -6%)
  • Medium voltage: 1 kV to 52 kV
  • High voltage: 52 kV to 230 kV
  • Extra high voltage: 230 kV to 765 kV

Legal/Official Sources:

  1. IEC Webstore (webstore.iec.ch): The official source. Search for "IEC 60038:2009". Cost is approximately 250-350 CHF. You receive a genuine, searchable PDF.
  2. National Standards Bodies:

    Safety & Design: Provides reference values for equipment insulation and system protection . Voltage Classification: LV, MV, HV, EHV | PDF - Scribd iec 60038 standard voltages pdf 103

    The standard is structured around specific tables defining nominal and highest equipment voltages: IEC 60038 Standard Voltage Overview | PDF | Volt - Scribd IEC 60038 is the primary international standard for

    Conclusion

    AC Systems: Transmission, distribution, and utilization systems above 100 V at frequencies of 50 Hz or 60 Hz. System nominal voltage (Un): 10 kV, 20 kV,

    Equipment Manufacturing: Defining reference values for insulation design, clearance distances, and testing.

Dave Fahrbach