IEC 62425:2007
Railway applications - Communication, signalling and processing systems - Safety related electronic systems for signalling

Standard No.

IEC 62425:2007

Release Date

2007

Published By

International Electrotechnical Commission (IEC)

Latest

IEC 62425:2007

Replace

IEC 9/1057/FDIS:2007

Scope

This International Standard is applicable to safety—related electronic systems(including sub- systems and equipment)for railway signalling applications． The scope of this standard，and its relationship with other IEC standards，are shown in Figure 1． This standard is intended to apply to all safety-related railway signalling systems/sub- system/equipment．However，the hazard analysis and risk assessment processes defined in IEC 62278 and this standard are necessary for all railway signalling systems/sub— systems，equipment，in order to identify any safety requirements．If analysis reveals that no safety requirements exist(i.e.:that the situation is non-safety-related)，and provided the conclusion is not revised as a consequence of later changes，this safety standard ceases to be applicable． This standard applies to the specification,design，construction，installation，acceptance， operation，maintenance and modification/extension phases of complete signalling systems，and also to individual sub-systems and equipment within the complete system．Annex C includes procedures relating to electronic hardware components． This standard applies to generic sub-systems and equipment(both application-independent and those intended for a particular class of application)，and also to systems/sub- systems/equipment for specific applications． This standard is not applicable to existing systems/sub-systems，equipment(i．e．those which had already been accepted prior to lhe creation of this standard)．However，as far as reasonably practicable，this standard should be applied to modifications and extensions to existing systems，sub-systems and equipment． This standard is primarily applicable to systems/sub—systems，equipment which have been specifically designed and manufactured for railway signalling applications．It should also be applied．as far as reasonably practicable，to general-purpose or industrial equipment(e．g.: power supplies，modems，etc．)，which is procured for use as part of a safety—related signalling system．As a minimum，evidence shall be provided in such cases to demonstrate —either that the equipment is not relied on for safety， 一or Ihat the equipment can be relied on for those functions which relate to safety． This standard is applicable to the functional safety of railway signalling systems．It is not intended to deal with the occupational health and safety of personnel；this subject is covered by other standards．

IEC 62425:2007 Referenced Document

• EN 50124-1 Railway applications - Insulation coordination - Part 1: Basic requirements - Clearances and creepage distances for all electrical and electronic equipment*， 2017-03-01 Update
• EN 50125-1 Railway applications - Environmental conditions for equipment - Part 1: Rolling stock and on-board equipment*， 2014-04-01 Update
• EN 50125-3 Railway applications - Environmental conditions for equipment Part 3: Equipment for signalling and telecommunications (Incorporating corrigendum May 2010)
• EN 50155 Railway Applications Electronic Equipment Used on Rolling Stock
• IEC 60664 Insulation coordination for equipment within low-voltage systems - ALL PARTS*， 2011-10-31 Update
• IEC 61508-1 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements*， 2010-04-01 Update
• IEC 62236 Railway applications - Electromagnetic compatibility - Part 5: Emission and immunity of fixed power supply installations and apparatus*， 2018-02-15 Update
• IEC 62236-4 Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus*， 2018-02-15 Update
• IEC 62278 Railway applications - Specification and demonstration of reliability, availability, maintainability and safety (RAMS)
• IEC 62279 Railway applications - Communication, signalling and processing systems - Software for railway control and protection systems*， 2015-06-01 Update
• IEC 62280-1 Railway applications - Communication, signalling and processing systems - Part 1: Safety-related communication in closed transmission systems
• IEC 62280-2 Railway applications - Communication, signalling and processing systems - Part 2: Safety-related communication in open transmission systems

IEC 62425:2007 history

• 2007 IEC 62425:2007 Railway applications - Communication, signalling and processing systems - Safety related electronic systems for signalling