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



Reference EN 61857-1:2005
Title Electrical insulation systems - Procedures for thermal evaluation - Part 1: General requirements - Low-voltage
Project Number 15788
Abstract/Scope Specifies a general test procedure for the thermal evaluation and qualification of electrical insulation systems (EIS) and establishes a procedure that compares the performance of a candidate EIS to that of a reference EIS. This basic standard is applicable to existing or proposed EIS used in electrotechnical products with an input voltage of up to 1 000 V where the thermal factor is the dominating ageing factor. This second edition cancels and replaces the first edition published in 1998, and constitutes a technical revision to make this basic standard compatible with parts 21 and 22.


Current Stage code 6060
Current Stage code date 2005-03-16
Current Stage code deadline 2005-11-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 112
Reference Document IEC 61857-1:2004 (EQV)
ICS 29.080.30 - Insulation systems
Keywords Insulating system; Thermal evaluation; LV
Note Superseded by EN 61857-1:2009
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2005-03-16 2005-11-01 export to doc file  EN  FR  DE
5099 2005-02-01 2005-05-01  
5061 2004-11-24 2005-02-01  
5020 2004-08-13 2004-10-15  
4099 2003-11-14 2004-02-28  
4020 2003-04-18 2003-09-19  
3099 2003-04-16 2003-04-18  

Implementation Dates

date of Ratification (DOR) (1) 2005-02-01
date of Availability (DAV) (2) 2005-03-16
date of Announcement (DOA) (3) 2005-05-01
date of Publication (DOP) (4) 2005-11-01
date of Withdrawal (DOW) (5) 2008-02-01


Supersedes EN 61857-1:1999
Superseded by EN 61857-1:2009
Normative reference (6) HD 611.4.1 S1:1992
EN 60216-5:2003
IEC 60493-1:1974
EN 60505:2004

(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.