International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 61508-4:2001
Title Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 4: Definitions and abbreviations
Project Number 6471
Abstract/Scope Contains the definitions and explanation of terms that are used in parts 1 to 7 of this standard. Intended for use by technical committees in the preparation of standards in accordance with the principles contained in IEC Guide 104 and ISO/IEC Guide 51. EN 61508 is also intended as a stand-alone standard. Has the status of a basic safety publication in accordance with IEC Guide 104.


Current Stage code 6060
Current Stage code date 2001-12-21
Current Stage code deadline 2002-08-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/SC 65A
Reference Document IEC 61508-4:1998 (EQV) + corrigendum Apr. 1999 (EQV)
ICS 25.040.40 - Industrial process measurement and control
29.020 - Electrical engineering in general
Keywords Safety; Functional safety; Abbreviation; Electronic; Programmable
Note Superseded by EN 61508-4:2010
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2001-12-21 2002-08-01 export to doc file  EN
5099 2001-07-03 2002-01-01  
5061 2001-04-20 2001-07-03  
5020 2000-09-29 2001-03-31  
3090 2000-07-04 2001-01-04  
3098 1996-03-05    
2020 1995-01-23 1995-07-31  

Implementation Dates

date of Ratification (DOR) (1) 2001-07-03
date of Availability (DAV) (2) 2001-12-21
date of Announcement (DOA) (3) 2002-02-01
date of Publication (DOP) (4) 2002-08-01
date of Withdrawal (DOW) (5) 2004-08-01


Superseded by EN 61508-4:2010
Normative reference (6) ISO/IEC Guide 51:1990
IEC Guide 104:1997
ISO/IEC 2382-14:1998
ISO 8402:1994
IEC 60050-191:1990
IEC 60050-351:1975
EN 61508-1:2001
EN 61508-2:2001
EN 61508-3:2001
EN 61508-5:2001
EN 61508-6:2001
EN 61508-7:2001

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.