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



Reference EN 62770:2014
Title Fluids for electrotechnical applications - Unused natural esters for transformers and similar electrical equipment
Project Number 24552
Abstract/Scope IEC 62770:2013 describes specifications and test methods for unused natural esters in transformers and similar oil-impregnated electrical equipment in which a liquid is required as an insulating and heat transfer medium. Natural esters with additives are within the scope of this standard. Because of their different chemical composition, natural esters differ from insulating mineral oils and other insulating fluids that have high fire points, such as synthetic esters or silicone fluids. Natural, ester-derived insulating fluids with low viscosity have been introduced but are not covered by this standard. Pertinent properties of such fluids are given in Annex B. This standard is applicable only to unused natural esters. Reclaimed natural esters and natural esters blended with non-natural esters fluids are beyond the scope of this standard.


Current Stage code 6060
Current Stage code date 2014-04-18
Current Stage code deadline 2014-09-24
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 10
Reference Document IEC 62770:2013 (EQV)
ICS 29.040 - Insulating fluids
Note Work started in CLC/SR 10 * D145/093: CLC/TC 10 set up * 2013-11-22 - Publication editing allocated to
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2014-04-18 2014-09-24 export to doc file  EN  FR  DE
5099 2013-12-24 2014-01-21  
5060 2013-10-21 2013-11-11 export to doc file  EN
5020 2013-08-16 2013-10-18  
3090 2013-08-13 2013-08-16  
5060 2013-02-25 2013-03-18 export to doc file  EN
5020 2012-11-16 2013-02-22  
1090 2012-11-13 2012-11-16  

Implementation Dates

date of Ratification (DOR) (1) 2013-12-24
date of Availability (DAV) (2) 2014-04-18
date of Announcement (DOA) (3) 2014-07-18
date of Publication (DOP) (4) 2014-10-18
date of Withdrawal (DOW) (5) 2016-12-24


Superseded by  
Normative reference (6) OECD 301:1992
ISO 2592
ISO 2719
ISO 3016
ISO 3104
ISO 3675
ISO 12185
EN 60076-14
EN 60156
EN 60247
EN 60296
EN 60475
EN 60666
EN 60814
EN 61100
EN 61125:1993
EN 61198
EN 61619
EN 61620
IEC 62021-3
EN 62535:2009
EN 62697-1

(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.