a.c. transmission, distribution and utilization systems and equipment for use in such systems with standard frequencies 50 Hz and 60 Hz having a nominal voltage above 100 V; a.c. and d.c. traction systems; a.c. and d.c. equipment having nominal voltages below 120 V a.c. or below 750 V d.c., the a.c. voltages being intended (but not exclusively) for 50 Hz and 60 Hz applications; such equipment covers batteries (from primary or secondary cells), other power supply devices (a.c. or d.c.), electrical equipment (including industrial and communication), and appliances. Has the status of a basic publication in accordance with IEC Guide 108 This consolidated version consists of the sixth edition (1993), its amendment 1 (1994) and its amendment 2 (1997). Therefore, no need to order amendments in addition to this publication.