This standard will apply to:
——Relays for the transportation, distribution and use of alternating current at the normal frequency of 50 Hz and 60 Hz with a nominal voltage greater than 100 V and to the materials used in such networks. - AC and direct current traction networks. - Alternating current and direct current materials with a nominal voltage less than 120 V in alternating current or less than 750 V in direct current, in which the alternating current voltages are intended essentially, although not exclusively, for the 50 Hz and 60 Hz systems; This material includes batteries (primary elements or secondary elements), other electrical energy supply devices (alternating current or direct current), electrical materials (including industrial and telecommunications equipment), electrical instruments. . This standard will not apply to normal voltages that represent or transmit measurement signals or values. This standard will not apply to normal voltages of components and elements used within electrical devices or details of equipment.