Alternating current power apparatus; Alternating current power installations; Apparatus for the control of power supply to electrically driven motors; Electric mains power units; Electric power storage apparatus; Electric power supplies (other than generators); Electric power supplies for electronic apparatus; Electric power supply units; Electric power supply units having stabilised output voltage; Electric power units; Electrical apparatus for the distribution of electric power; Power installations (other than generators); Power packs (batteries); Power supply apparatus (batteries); Power supply devices (batteries); Power supply devices (transformers); Power supply units (batteries); Power supply units (transformers); Power units (batteries); Power units (transformers); Regulated power supply apparatus; Reserve electrical power supply apparatus (other than generators); Static power supply units; Switching power supply apparatus