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



Reference EN 61472:2013
Title Live working - Minimum approach distances for a.c systems in the voltage range 72,5 kV to 800 kV - A method of calculation
Project Number 23931
Abstract/Scope IEC 61472:2013 describes a method for calculating the minimum approach distances for live working, at maximum voltages between 72,5 kV and 800 kV. This standard addresses system overvoltages and the working air distances or tool insulation between parts and/or workers at different electric potentials. The required withstand voltage and minimum approach distances calculated by the method described in this standard are evaluated taking into consideration - if the workers are trained for, and skilled in, working in the live working zone; - if the anticipated overvoltages do not exceed the value selected for the determination of the required minimum approach distance; - if transient overvoltages are the determining overvoltages; - if tool insulation has no continuous film of moisture or measurable contamination present on the surface; - if no lightning is seen or heard within 10 km of the work site; - if allowance is made for the effect of conducting components of tools; and - if the effect of altitude, insulators in the gap, etc, on the electric strength is taken into consideration. For conditions other than the above, the evaluation of the minimum approach distances may require specific data, derived by other calculation or obtained from additional laboratory investigations on the actual situation. This third edition cancels and replaces the second edition of IEC 61472 published in 2004. It constitutes a technical revision. Significant changes with regard to the second edition are: - the clarification of the scope; - the review of the definitions; - the clarification of the methodology of determining whether live working is permissible and the calculation of the minimum approach distances; - the modification of the basic equation for calculation of the minimum approach distance; and - the introduction of Table 1 for altitude correction factor simplification ka.


Current Stage code 6060
Current Stage code date 2013-07-05
Current Stage code deadline 2014-02-16
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/TC 78
Reference Document IEC 61472:2013 (EQV)
ICS 13.260 - Protection against electric shock
29.240.20 - Power transmission and distribution lines
29.260.99 - Other electrical equipment for working in special conditions
Keywords Live working; Approach distances; A.C.; Calculation method
Note 2013-05-02 - Publication editing allocated to * Supersedes EN 61472:2004
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2013-07-05 2014-02-16 export to doc file  EN  FR  DE
5099 2013-05-16 2013-06-13  
5060 2013-03-18 2013-04-08 export to doc file  EN
5020 2013-01-11 2013-03-15  
3090 2013-01-08 2013-01-11  
5060 2012-05-14 2012-06-04 export to doc file  EN
5020 2011-12-09 2012-05-11  
1090 2011-12-06 2011-12-09  

Implementation Dates

date of Ratification (DOR) (1) 2013-05-16
date of Availability (DAV) (2) 2013-07-05
date of Announcement (DOA) (3) 2013-08-16
date of Publication (DOP) (4) 2014-02-16
date of Withdrawal (DOW) (5) 2016-05-16


Supersedes EN 61472:2004
Superseded by  
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.