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



Reference EN 61857-1:1999
Title Electrical insulation systems - Procedures for thermal evaluation - Part 1: General requirements - Low-voltage
Project Number 12257
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. Is applicable to existing or proposed EISs used in electrotechnical products with an input voltage of up to 1 000 V where the thermal factor is the dominating ageing factor.


Current Stage code 6060
Current Stage code date 1999-01-26
Current Stage code deadline 1999-10-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 112
Reference Document IEC 61857-1:1998 (EQV)
ICS 29.080.01 - Electrical insulation in general
Keywords Insulating system; Thermal evaluation; LV
Note EN following parallel vote * Superseded by EN 61857-1:2005
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 1999-01-26 1999-10-01  
5099 1999-01-01 1999-02-01  
5062 1998-11-03 1999-01-01  
5020 1998-07-03 1998-09-15  
1090 1998-06-30 1998-10-31  

Implementation Dates

date of Ratification (DOR) (1) 1999-01-01
date of Availability (DAV) (2) 1999-01-26
date of Announcement (DOA) (3) 1999-04-01
date of Publication (DOP) (4) 1999-10-01
date of Withdrawal (DOW) (5) 2001-10-01


Superseded by EN 61857-1:2005
Normative reference (6) HD 566 S1:1990
EN 60216-3-2:1995
HD 611.4.1 S1:1992
IEC 60493-1:1974
IEC 60505:1975

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of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn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