• IEC 61472:2013

    Current The latest, up-to-date edition.

    Live working - Minimum approach distances for a.c. systems in the voltage range 72,5 kV to 800 kV - A method of calculation

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    Published date:  11-04-2013

    Publisher:  International Electrotechnical Committee

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    Table of Contents - (Show below) - (Hide below)

    FOREWORD
    1 Scope
    2 Terms, definitions and symbols
    3 Methodology
    4 Factors influencing calculations
    5 Evaluation of risks
    6 Calculation of minimum approach distance D[A]
    Annex A (informative) - Ergonomic distance
    Annex B (informative) - Overvoltages
    Annex C (informative) - Dielectric strength of air
    Annex D (informative) - Gap factor k[g]
    Annex E (informative) - Allowing for atmospheric
            conditions
    Annex F (informative) - Influence of floating conductive
            objects on the dielectric strength
    Annex G (informative) - Live working near contaminated,
            damaged or moist insulation
    Bibliography

    Abstract - (Show below) - (Hide below)

    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. The contents of the corrigendum of October 2015 have been included in this copy.

    General Product Information - (Show below) - (Hide below)

    Committee TC 78
    Development Note Stability Date: 2017. (04/2013)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    CEI EN 62193 : 2005 LIVE WORKING - TELESCOPIC STICKS AND TELESCOPIC MEASURING STICKS
    BS EN 60903:2003 LIVE WORKING - GLOVES OF INSULATING MATERIAL
    I.S. EN 50110-1:2013 OPERATION OF ELECTRICAL INSTALLATIONS - PART 1: GENERAL REQUIREMENTS
    BS EN 50341-1:2012 OVERHEAD ELECTRICAL LINES EXCEEDING AC 1 KV - PART 1: GENERAL REQUIREMENTS - COMMON SPECIFICATIONS
    IEC 61230:2008 Live working - Portable equipment for earthing or earthing and short-circuiting
    EN 61479:2001/A1:2002 LIVE WORKING - FLEXIBLE CONDUCTOR COVERS (LINE HOSES) OF INSULATING MATERIAL
    EN 61230:2008 LIVE WORKING - PORTABLE EQUIPMENT FOR EARTHING OR EARTHING AND SHORT-CIRCUITING
    BS IEC 61865:2001 OVERHEAD LINES - CALCULATION OF THE ELECTRICAL COMPONENT OF DISTANCE BETWEEN LIVE PARTS AND OBSTACLES - METHOD OF CALCULATION
    BS EN 61479:2001 Live working. Flexible conductor covers (line hoses) of insulating material
    BS EN 62193:2003 LIVE WORKING - TELESCOPIC STICKS AND TELESCOPIC MEASURING STICKS
    EN 50341-1:2012 OVERHEAD ELECTRICAL LINES EXCEEDING AC 1 KV - PART 1: GENERAL REQUIREMENTS - COMMON SPECIFICATIONS
    I.S. EN 62193:2003 LIVE WORKING - TELESCOPIC STICKS AND TELESCOPIC MEASURING STICKS
    CEI EN 50110-1 : 2014 OPERATION OF ELECTRICAL INSTALLATIONS - PART 1: GENERAL REQUIREMENTS
    BS EN 50110-1:2013 Operation of electrical installations General requirements
    99/201503 DC : 0 IEC 61479 ED.1 - LIVE WORKING - CONDUCTOR COVERS (LINE HOSES) OR INSULATING MATERIAL FOR ELECTRICAL PURPOSES
    EN 61057:2017 Live working - Insulating aerial devices for mounting on a chassis
    I.S. EN 61057:2017 LIVE WORKING - INSULATING AERIAL DEVICES FOR MOUNTING ON A CHASSIS
    I.S. EN 61230:2008 LIVE WORKING - PORTABLE EQUIPMENT FOR EARTHING OR EARTHING AND SHORT-CIRCUITING
    I.S. EN 50341-1:2012 OVERHEAD ELECTRICAL LINES EXCEEDING AC 1 KV - PART 1: GENERAL REQUIREMENTS - COMMON SPECIFICATIONS
    CEI EN 50341-1 : 2013 OVERHEAD ELECTRICAL LINES EXCEEDING AC 1 KV - PART 1: GENERAL REQUIREMENTS - COMMON SPECIFICATIONS
    I.S. EN 61479:2001 LIVE WORKING - FLEXIBLE CONDUCTOR COVERS (LINE HOSES) OF INSULATING MATERIAL
    12/30260570 DC : 0 BS EN 50341-1 - OVERHEAD ELECTRICAL LINES EXCEEDING AC 1 KV - PART 1: GENERAL REQUIREMENTS - COMMON SPECIFICATIONS
    BS EN 60832-1:2010 LIVE WORKING - INSULATING STICKS AND ATTACHABLE DEVICES - PART 1: INSULATING STICKS
    BS EN 61057:1994 LIVE WORKING - INSULATING AERIAL DEVICES FOR MOUNTING ON A CHASSIS
    UNE-EN 50110-1:2014 Operation of electrical installations - Part 1: General requirements
    I.S. EN 60903:2003 LIVE WORKING - GLOVES OF INSULATING MATERIAL
    IEC 61057:2017 Live working - Insulating aerial devices for mounting on a chassis
    IEC 61479:2001+AMD1:2002 CSV Live working - Flexible conductor covers (line hoses) of insulating material
    IEC 60832-1:2010 Live working - Insulating sticks and attachable devices - Part 1: Insulating sticks
    IEC 62193:2003 Live working - Telescopic sticks and telescopic measuring sticks
    PREN 50341-1 : DRAFT 2012 OVERHEAD ELECTRICAL LINES EXCEEDING AC 1 KV - PART 1: GENERAL REQUIREMENTS - COMMON SPECIFICATIONS
    CEI EN 60832-1 : 2011 LIVE WORKING - INSULATING STICKS AND ATTACHABLE DEVICES - PART 1: INSULATING STICKS
    BS EN 61230:2008 LIVE WORKING - PORTABLE EQUIPMENT FOR EARTHING OR EARTHING AND SHORT-CIRCUITING
    IEC 61865:2001 Overhead lines - Calculation of the electrical component of distance between live parts and obstacles - Method of calculation
    I.S. EN 60832-1:2010 LIVE WORKING - INSULATING STICKS AND ATTACHABLE DEVICES - PART 1: INSULATING STICKS
    UNE-EN 60832-1:2011 Live working - Insulating sticks and attachable devices -- Part 1: Insulating sticks
    EN 60832-1 : 2010 LIVE WORKING - INSULATING STICKS AND ATTACHABLE DEVICES - PART 1: INSULATING STICKS
    EN 50110-1:2013 OPERATION OF ELECTRICAL INSTALLATIONS - PART 1: GENERAL REQUIREMENTS
    EN 60903 : 2003 COR 2005 LIVE WORKING - GLOVES OF INSULATING MATERIAL
    EN 62193 : 2003 LIVE WORKING - TELESCOPIC STICKS AND TELESCOPIC MEASURING STICKS

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 61477:2009 Live working - Minimum requirements for the utilization of tools, devices and equipment
    IEC 60743:2013 Live working - Terminology for tools, devices and equipment
    IEC 60071-2:1996 Insulation co-ordination - Part 2: Application guide
    IEC 60050-651:2014 International Electrotechnical Vocabulary (IEV) - Part 651: Live working
    IEC 60060-1:2010 High-voltage test techniques - Part 1: General definitions and test requirements
    IEC 60071-1:2006+AMD1:2010 CSV Insulation co-ordination - Part 1: Definitions, principles and rules
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