Low-voltage switchgear & controlgear. Control circuit devices & switching elements. Requirements for proximity devices with defined behaviour under fault conditions (PDDB) Switchgear, Electrical equipment, Electric control equipment, Low-voltage equipment, Low voltage, Control devices, Proximity switches, Electrical faults, Classification systems, Marking, Instructions for use, Identification methods, Colour codes, Electric cables, Integrated circuits, Programming, Computer software, Performance, Temperature rise, Performance testing, Verification, Type testing, Assessed quality, Electric conductors, Electric connectors, Printed-circuit boards, Terminal blocks, Multicontact connectors, Control switches, Electromechanical devices, Electrical components, Transformers, Inductors, Resistors, Capacitors, Electric motors