In addition to the rules given in EN 60077-1, this European standard provides general rules for all electrotechnical components installed in power circuits, auxiliary circuits and control circuits, etc., on rolling stock. NOTE Certain of these rules may, after agreement between user and manufacturer, be used for electrotechnical components installed on vehicles other than rail rolling stock such as mine locomotives, trolleybuses, etc. The purpose of this standard is to adapt the general rules given in EN 60077-1 to all electrotechnical components for rolling stock, in order to obtain uniformity of requirements and tests for the corresponding range of components. Electrotechnical components are mainly switchgear and controlgear, irrespective of their control, including also relays, valves, resistors, fuses, etc. NOTE The incorporation of electronic components or electronic sub-assemblies into electrotechnical components is now common practice. Although this standard is not applicable to electronic equipment, the presence of electronic components does not provide a reason to exclude such electrotechnical components from the scope. Electronic sub-assemblies should comply with the relevant standard. This standard states a) the characteristics of the components, b) the constructional and performance requirements with which components have to comply, c) the tests intended to confirm compliance of the components with these characteristics under these service conditions, and the methods to be adopted for these tests, d) the information to be marked on the apparatus.