This standard specifies general requirements for capacitor units and capacitor banks intended to be used in particular for power-factor correction of a.c. power systems having a rated voltage above 660 V and a rated frequency of 15 Hz to 60 Hz. The standard also covers capacitors intended for use in power filter circuits, system earthing and damping of transients.NOTES:1. In this standard, the word 'capacitor' is used when it is not necessary to lay particular stress upon the different meanings of the word, e.g. 'capacitor unit' or 'capacitor bank'.2. Additional requirements for capacitors to be protected by internal fuses, as well as requirements for the internal fuses, are given in Appendix E.3. Additional requirements for capacitors to be protected by external fuses, as well as requirements for the external fuses, are given in Appendix F.4. Additional definitions, requirements and tests for filter capacitors are given in Appendix G.The following capacitors are excluded from this standard:(a) Shunt capacitors for a.c. power systems of up to and including 660 V rated voltage.(b) Capacitors for induction heat-generating plants, operating at frequencies between 40 Hz and 24 000 Hz.(c) Series capacitors for power systems.(d) Capacitors for motor starting and running applications and the like.(e) Coupling capacitors and capacitor dividers.(f) Capacitors to be used in power electronics circuits.(g) Small a.c. capacitors to be used for fluorescent and discharge lamps.(h) Capacitors for suppression of radio interference.(j) Capacitors intended to be used in various types of electrical equipment and thus considered as components.(k) Capacitors intended to be used with d.c. voltage superimposed on an a.c. voltage.(l) High voltage capacitors composed of low-voltage capacitors of the self-healing metallized dielectric type.