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



Reference HD 540.2 S1:1991
Title Insulation co-ordination - Part 2: Application guide
Project Number 411
Abstract/Scope This publication provides some guidance on the selection of the electric strength of equipment of surge arresters or protective spark gaps and on the extent to which it will be useful to control switching overvoltages - The object of this publication is not to give strict rules for insulation co-ordination and design but to provide guidance toward rational and economical solutions - Therefore it is intended to consider only a few basic cases in this publication it being evident that installations constituting exceptions to normal design or included within systems having exceptional characteristics will require special study by experienced engineers - This application Guide is based on apparatus types and ratings in use at the time of publication - As new equipment and equipment characteristics are developed and proved this guide should not be interpreted as a limit to their adoption - Like Publication 71-1, Publication 71-2 covers only phase-to-earth insulation - Like Publication 71-1, Publication 71-2 deals separately with the three following ranges of the highest voltage for equipment: 1) Range A: above 1 kV and less than 52 kV * 2) Range B: from 52 kV to less than 300 kV * 3) Range C: 300 kV and above - It covers installations of all kinds and in all situations involving voltages higher than 1 kV whether or not they are exposed to lightning with the exception of overhead lines - However the test procedures apply also to the latter


Current Stage code 6060
Current Stage code date 1991-10-11
Current Stage code deadline 1992-04-01
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 28
Reference Document IEC 60071-2:1976 (EQV)
Keywords Insulation; Coordination; Application guide
Note Superseded by EN 60071-2:1997
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 1991-10-11 1992-04-01  
5099 1990-03-05 1990-04-05  
5020 1989-10-09 1990-01-15  
1599 1989-06-12 1989-10-12  
1520 1988-12-02 1989-03-15  

Implementation Dates

date of Ratification (DOR) (1) 1990-03-05
date of Availability (DAV) (2) 1991-10-11
date of Announcement (DOA) (3) 1990-09-01
date of Publication (DOP) (4) 1992-04-01
date of Withdrawal (DOW) (5) 1992-04-01


Superseded by EN 60071-2:1997
Normative reference (6)  

(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.