Such connectors consist of two parts: a fixed connector with female contacts, permanently mounted on pieces of equipment and permanently wired, and a free connector with male or female contacts located at the end of the cordset. Connections between fixed and free connector consist of two rows of 10 contacts in a staggered arrangement (plus a special shield contact). The centre to centre distance between contacts in a row is 3,81 mm. The distance between the centre lines of the rows is 5,08 mm. Specifies IEC type designation, common features amd isometric view, gauges, characteristics, test schedule.