This standard applies to all electronic equipment for control, regulation, protection, supply, etc., installed on rail vehicles and associated with:- either the accumulator battery of the vehicle;- or a low voltage power supply source with or without a direct connection to the contact system(transformer, potentiometer device, auxiliary supply);with the exception of electronic power circuits, which conform to EN 50207.This standard covers the conditions of operation, design, construction, and testing of electronicequipment, as well as basic hardware and software requirements considered necessary for competent, reliable equipment.Additional requirements in ot