scope:

Applies to: - a.c. transmission, distribution and utilization systems and equipment with standard frequencies 50 and 60 Hz and a nominal voltage above 100 V; - a.c. and d.c. traction systems; - a.c. and d.c. equipment with nominal voltages below 120 V a.c. or below 750 V d.c. Nen 10 038 does not apply to existing a.c. systems which will not be extended in future, such as: - a.c. three-phase three-wire systems for heavy industrial applications having a nominal voltage of 500 V; - a.c. three-phase systems having a nominal voltage of 25 kV.