PD IEC/TR 60725:2012

FOREWORD
1 Scope
2 Normative references
3 Systems of low-voltage supply
4 Supply impedances
5 Reference impedances
6 Impedance at frequencies above the supply frequency
Annex A (informative) - Methods for determining the
        maximum modulus values of public electricity
        supply low-voltage network impedances relevant
        to three-phase services of more than 100 A per
        phase at 50 Hz
Annex B (informative) - Methods for determining the
        maximum modulus values of public electricity
        supply low-voltage network impedances relevant
        to three-phase services of more than 100 A per
        phase at 60 Hz
Annex C (informative) - Measurement of supply impedance
        and survey method
Bibliography

Provides the information that was available and the factors that were taken into account in arriving at the reference impedances that were incorporated in IEC 60555 and which are now incorporated in some parts of IEC 61000-3.

This Technical Report records the information that was available and the factors that were taken into account in arriving at the reference impedances that were incorporated in IEC 60555 and which are now incorporated in some parts of IEC 61000-3.

In addition, information is given on the impedances of public supply networks associated with service current capacities ≥100 A per phase.