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



Reference EN 60079-25:2010
Title Explosive atmospheres - Part 25: Intrinsically safe electrical systems
Project Number 22008
Abstract/Scope IEC 60079-25:2010 contains the specific requirements for construction and assessment of intrinsically safe electrical systems, type of protection 'i', intended for use, as a whole or in part, in locations in which the use of Group I, II or III apparatus is required. This standard supplements and modifies the general requirements of IEC 60079-0 and the intrinsic safety standard IEC 60079-11. Where a requirement of this standard conflicts with a requirement of IEC 60079-0 or IEC 60079-11, the requirement of this standard takes precedence. This standard supplements IEC 60079-11, the requirements of which apply to electrical apparatus used in intrinsically safe electrical systems. The installation requirements of Group II or Group III systems designed in accordance with this standard are specified in IEC 60079-14. The significant changes with respect to the previous edition are: - extension of the scope from Group II to Groups I, II and III; - introduction of level of protection 'ic'; - addition of requirements for cables and multi-core cables; - reference to IEC 60079-11 regarding the termination of intrinsically safe circuits; - requirements for the assessment of an expanded and clarified intrinsically safe system regarding level of protection 'ic', simple apparatus and faults in multi-core cables; - introduction of predefined systems and merging of the system requirements for FISCO from IEC 60079-27; - addition of requirements for simple intrinsically safe systems containing both lumped inductance and lumped capacitance; - addition of a method for testing the electrical parameters of cables; - additional information for the use of simple apparatus in systems.


Current Stage code 6060
Current Stage code date 2010-10-15
Current Stage code deadline 2011-07-01
Deadline date for vote  


Directive(s) ATEX (94/9/EC)
Order Voucher  


IEC Technical Body IEC/SC 31G
Reference Document IEC 60079-25:2010 (EQV)
ICS 29.260.20 - Electrical apparatus for explosive atmospheres
Keywords Explosive; Atmosphere; Intrinsically; Safe
Note Supersedes EN 60079-25:2004 * D145/C093: BT asked CCMC to issue a corrigendum to EN 60079-25:2010 to add the superseding information towards EN 50394-1:2004 (see PR = 25086).
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2010-10-15 2011-07-01 export to doc file  EN  FR  DE
5099 2010-10-01 2010-12-01  
5061 2010-08-25 2010-10-01  
5060 2010-01-26 2010-02-09 export to doc file  EN
5020 2009-11-20 2010-01-22  
3090 2009-07-17 2009-09-30  
5060 2009-02-24 2009-03-09 export to doc file  EN
5020 2008-09-19 2009-02-20  
1090 2008-09-16 2008-09-19  

Implementation Dates

date of Ratification (DOR) (1) 2010-10-01
date of Availability (DAV) (2) 2010-10-15
date of Announcement (DOA) (3) 2011-01-01
date of Publication (DOP) (4) 2011-07-01
date of Withdrawal (DOW) (5) 2013-10-01


Supersedes EN 50394-1:2004
EN 60079-25:2004
Superseded by  
Normative reference (6) EN 60060-1:2010
EN 60079-0:2009
EN 60079-11
EN 60079-14
EN 60079-15:2010
EN 60079-27
EN 61158-2:2010
EN 61241-0:2006
EN 61241-11:2006

(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.