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Standard

IEC 60781:1989 ED1

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Abstract

This application guide presents a practical method to be used when calculating short-circuit currents in low-voltage networks. The method corresponds strictly with IEC 60909 and leads to conservative results with sufficient accuracy. Two short-circuit currents which differ in magnitude are to be calculated: -the maximum short-circuit current which causes the maximum thermal and electromagnetic effects on electrical equipment and determines the required capacity or rating; -the minimum short-circuit current which may be a basis for the adjustment of protective devices.

Document information

  • Standard from IEC
  • Published:
  • Withdrawn:
  • Edition: 1
  • Version: 1
  • Document type: IS
  • ICS 17.220.01
  • ICS 29.240.20
  • ISO TC TC 73

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