Medium Voltage – MV

30-second summary

Medium Voltage – MV

In the United States, the American National Standards Institute (ANSI), specifically ANSI C84.1-2020 defines medium voltage as 2.4 to 69kV.

Medium voltage installations involve equipment that falls into one of five major categories. These are:

  • generators, 
  • switchgear,
  • conductors or cables,
  • transformers,
  • and utilization equipment.
medium voltage

Classification of Voltage Levels- ANSI

In the United States, the American National Standards Institute (ANSI) establishes nominal voltage ratings for 60 Hz electric power systems over 100 V. Specifically, ANSI C84.1-2020 defines:

  • low voltage as 240 to 600 V
  • medium voltage as 2.4 to 69kV
  • high voltage as 115 kV to 230 kV, 
  • extra-high voltage as 345 kV to 765 kV, 
  • and ultra-high voltage as 1,100 kV.

Classification of Voltage Levels – BS 7671

British Standard BS 7671:2008 defines high voltage as any voltage difference between conductors that is higher than 1000 VAC or 1500 V ripple-free DC, or any voltage difference between a conductor and Earth that is higher than 600 VAC or 900 V ripple-free DC.

Classification of Voltage Levels- IEC

In the context of building wiring and the general use of an electrical apparatus, the International Electrotechnical Commission defines:

  • high voltage as more than 1,000 volts (V) of alternating current (AC) and above 1,500 V of direct current (DC). 
  • low voltage as voltage between 50 – 1,000 volts of alternating current and between 120 – 1,500 V of direct current.
  • extra-low voltage as lower than 50 V of alternating current and 120 V of direct current

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