IEC 60364-4-442:1993+AMD1:1995+AMD2:1999 CSV

FOREWORD
INTRODUCTION
442.1 General
        442.1.1 Scope and object
        442.1.2 Fault-voltage
        442.1.3 Stress-voltage
        442.1.4 Normative references
442.2 Earthing systems in transformer sub-stations
442.3 Earthing arrangements in transformer sub-stations
442.4 Earthing arrangements with regard to type of
        earthing systems in LV installations
        442.4.1 Symbols
        442.4.2 TN-systems
        442.4.3 Systems
        442.4.4 IT-systems
442.5 Limitation of stress-voltage in LV equipment of
        transformer sub-stations
        442.5.1 TN- and TT-systems
        442.5.2 IT-systems
442.6 Stress voltage in case of loss of the neutral
        conductor in a TN and TT system
442.7 Stress voltage in case of accidental earthing of
        an IT system
442.8 Stress voltage in case of a short circuit between
        a line conductor and the neutral conductor
Figures
Annex A (informative) Explanatory notes

Gives rules to ensure the safety of persons and equipment in a LV system if a fault occurs between the HV system and earth in the HV part of transformer stations which supply low-voltage systems.