Applies to fixed d.c. capacitors, with a rated voltage not exceeding 3,000V, containing a dielectric of mica sheets and electrodes of either thin metal foils or thin layers of metal deposited on the dielectric. They are designed for use in equipment for telecommunication and in electronic devices. Capacitors for a reactive power exceeding 10,000 var are excluded, as are the following : mica capacitors, button style, mica power capacitors, mica pulse capacitors and mica chip capacitors.