BS EN 50155:2017

European foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 General requirements
5 Electrical service conditions
6 Reliability, maintainability and expected useful life
7 Design
8 Non-railway designed electronic equipment
9 Components
10 Construction
11 Safety
12 Documentation
13 Testing
Annex A (informative) - List of default requirements of
        EN 50155 and related clauses
Annex B (informative) - Testing approach
Annex C (informative) - Severity of the service conditions
        in different rolling stock locations
Annex D (informative) - Example of test report compliance
        summary
Annex E (informative) - Life cycle model examples - Programmable
        component life cycle example
Annex F (informative) - Design guidelines for electronic hardware
        used on board of rolling stock
Annex G (informative) - Non-railway designed electronic equipment
Annex H (informative) - Paragraphs with Agreements between the
        involved Parties
Annex ZZ (informative) - Relationship between this European Standard
         and the Essential Requirements of EU Directive 2008/57/EC
Bibliography

Pertains to all electronic equipment for control, regulation, protection, diagnostic, energy supply, etc. installed on rail vehicles.

This European Standard applies to all electronic equipment for control, regulation, protection, diagnostic, energy supply, etc. installed on rail vehicles. For the purpose of this European Standard, electronic equipment is defined as equipment mainly composed of semiconductor devices and recognized associated components. These components will mainly be mounted on printed boards. Sensors (current, voltage, speed, etc.) and Semiconductor drive unit (SDU) for power electronic devices are covered by this standard. Complete Semiconductor drive unit (SDU) and power converters are covered by This European Standard covers the conditions of operation, design requirements, documentation, and testing of electronic equipment, as well as basic hardware and software requirements considered necessary for compliant and reliable equipment. Specific requirements related to practices necessary to ensure defined levels of functional safety will be determined in accordance with relevant railway safety standards. The software requirements for on board railway equipment are specified by EN50657 .