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Project

Reference EN 61472:2004
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 15709
Abstract/Scope 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 between parts and/or workers at different potentials. The required withstand voltage and minimum approach distances calculated by the method described in this standard are evaluated taking into consideration the following: - workers are trained for, and skilled in, working in the live working zone; - the anticipated overvoltages do not exceed the value selected for the determination of the required minimum approach distance; - transient overvoltages are the determining overvoltages; - tool insulation has no continuous film of moisture present on the surface; - no lightning is seen or heard within 10 km of the work site; - allowance is made for the effect of conducting components of tools; - the effect of altitude 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.
Status
Published

Status

Current Stage code 6060
Current Stage code date 2004-11-19
Current Stage code deadline 2005-07-01
Deadline date for vote  

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Details

IEC Technical Body IEC/TC 78
Reference Document IEC 61472:2004 (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Note Superseded by EN 61472:2004
A-Deviation(s)  
Special National Condition(s)  

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Information

History

Stage
Date
Deadline Date
Documents
6060 2004-11-19 2005-07-01 export to doc file  EN
5099 2004-10-01 2005-01-01  
5061 2004-08-23 2004-10-01  
5020 2004-04-16 2004-06-18  
4099 2003-12-19 2004-01-31  
4020 2003-03-21 2003-09-05  
3099 2003-03-18 2003-03-21  

Implementation Dates

date of Ratification (DOR) (1) 2004-10-01
date of Availability (DAV) (2) 2004-11-19
date of Announcement (DOA) (3) 2005-01-01
date of Publication (DOP) (4) 2005-07-01
date of Withdrawal (DOW) (5) 2007-10-01

Relations

Supersedes  
Superseded by EN 61472:2013
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.