• I.S. EN 60990:2016

    Current The latest, up-to-date edition.

    METHODS OF MEASUREMENT OF TOUCH CURRENT AND PROTECTIVE CONDUCTOR CURRENT

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  01-01-2016

    Publisher:  National Standards Authority of Ireland

    For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
    Only cited Standards give presumption of conformance to New Approach Directives/Regulations.

    Dates of withdrawal of national standards are available from NSAI.

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

    INTRODUCTION
    1 Scope
    2 Normative references
    3 Definitions
    4 Test site
          4.1 Test site environment
          4.2 Test transformer
          4.3 Earthed neutral conductor
    5 Measuring equipment
          5.1 Selection of measuring network
                 5.1.1 Perception and reaction (a.c.)
                 5.1.2 Lot-go (a.c.)
                 5.1.3 Electric burn (a.c.)
                 5.1.4 Ripple-free d.c.
          5.2 Test electrodes
                 5.2.1 Construction
                 5.2.2 Connection
          5.3 Configuration
          5.4 Power connections during test
                 5.4.1 General
                 5.4.2 Equipment for use only on TN to TT
                          star power distribution systems
                 5.4.3 Equipment for use on IT power
                          distribution systems including
                          unearthed delta systems
                 5.4.4 Equipment for use on single-phase
                          centre-earthed power supply systems
                          or on centre-earthed delta power supply
                          systems
          5.5 Supply voltage and frequency
                 5.5.1 Supply voltage
                 5.5.2 Supply frequency
    6 Test procedure
          6.1 General
                 6.1.1 Control switches, equipment and supply
                          conditions
                 6.1.2 Use of measuring networks
          6.2 Normal and fault conditions of equipment
                 6.2.1 Normal operation of equipment
                 6.2.2 Equipment and supply fault conditions
    7 Evaluation of results
          7.1 Perception, reaction and let- go
          7.2 Electric burn
    8 Measurement of protective conductor current
          8.1 General
          8.2 Multiple equipment
          8.3 Measuring method
    Annex A (normative) Equipment
    Annex B (normative) use of conductive plane
    Annex C (normative) Incidentally connected parts
    Annex D (informative) Choice of current limits
    Annex E (informative) Networks for use in measurement of
                          touch current
    Annex F (informative) Measuring network limitations and
                          construction
    Annex G (informative) Construction and application of touch
                          current measuring instruments
    Annex H (informative) Grippable part
    Annex J (informative) AC power distribution systems (see 5.4)
    Annex K (informative) Routine and periodic touch current
                          tests, and tests after repair or
                          modification of mains operated equipment
    Annex L (normative) Performance and calibration
    Annex M (informative) Bibliography
    Annex ZA (normative) Normative references to international
                         publications with their corresponding
                         European publications
    Figure 1 - Example of earthed neutral, direct supply
    Figure 2 - Example of earthed neutral, with transformer for
               isolation
    Figure 3 - Measuring network, unweighted touch current
    Figure 4 - Measuring network, touch current weighted for
               perception or reaction
    Figure 5 - Measuring network, touch current weighted for
               let-go
    Figure 6 - Test configuration: single-phase equipment on
               star TN or TT system
    Figure 7 - Test configuration: single-phase equipment on
               centre-earthed TN or TT system
    Figure 8 - Test configuration: single-phase equipment
               connected line-to-line on star TN or TT system
    Figure 9 - Test configuration: single-phase equipment
               connected line-to-neutral on star IT system
    Figure 10 - Test configuration: single-phase equipment
                connected line-to-line on star IT system
    Figure 11 - Test configuration: three-phase equipment on
                star TN or TT system
    Figure 12 - Test configuration: three-phase equipment on
                star IT system
    Figure 13 - Test configuration: unearthed delta system
    Figure 14 - Test configuration: three-phase equipment on
                centre-earthed delta system
    Figure A.1 - Equipment
    Figure B.1 - Equipment platform
    Figure F.1 - Frequency factor for electric burn
    Figure F.2 - Frequency factor for perception or reaction
    Figure F.3 - Frequency factor for let-go
    Figure H.1 - Grippable part test device
    Figure J.1 - Examples of TN-S power system
    Figure J.2 - Example of TN-C-S power system
    Figure J.3 - Example of TN-C power system
    Figure J.4 - Example of single-phase, 3- wire TN-C power
                 system
    Figure K.5 - Example of 3-line and neutral TT power system
    Figure J.6 - Example of 3-line TT power system
    Figure J.7 - Example of 3-line (and neutral) IT power system
    Figure J.8 - Example of 3-line IT power system
    Table L.1 - Calculated input impedance and transfer impedance
                for unweighted touch current measuring network
                (Figure 3)
    Table L.2 - Calculated input impedance and transfer impedance
                for perception or reaction touch current measuring
                network (Figure 4)
    Table L.3 - Calculated input impedance and transfer impedance
                for let-go current measuring network (Figure 5)
    Table L.4 - Output voltage to input voltage ratios for
                unweighted touch current measuring network
                (Figure 3)
    Table L.5 - Output voltage to input voltage ratios for
                perception of reaction measuring network
                (Figure 4)
    Table L.6 - Output voltage to input voltage ratios for
                let-go measuring network (Figure 5)

    Abstract - (Show below) - (Hide below)

    Covers measurement methods for d.c. or a.c. of sinusoidal or non-sinusoidal waveform, which could flow through the human body, and current flowing through a protective conductor.

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

    Development Note For CENELEC adoptions of IEC publications, please check www.iec.ch to be sure that you have any corrigenda that may apply. (01/2017)
    Document Type Standard
    Publisher National Standards Authority of Ireland
    Status Current

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

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    IEC TS 60479-1:2005+AMD1:2016 CSV Effects of current on human beings and livestock - Part 1: Generalaspects
    IEC 60050-195:1998 International Electrotechnical Vocabulary (IEV) - Part 195: Earthing and protection against electric shock
    IEC 60364-4-41:2005+AMD1:2017 CSV Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock
    IEC 60364-1:2005 Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions
    ISO/IEC Guide 51:2014 Safety aspects Guidelines for their inclusion in standards
    ISO/IEC Guide 50:2014 Safety aspects Guidelines for child safety in standards and other specifications
    IEC GUIDE 104:2010 The preparation of safety publications and the use of basic safety publications and group safety publications
    EN 61140 : 2016 PROTECTION AGAINST ELECTRIC SHOCK - COMMON ASPECTS FOR INSTALLATION AND EQUIPMENT (IEC 61140:2016)
    IEC 61140:2016 Protection against electric shock - Common aspects for installation and equipment
    IEC 60309-1:1999+AMD1:2005+AMD2:2012 CSV Plugs, socket-outlets and couplers for industrial purposes - Part 1: General requirements
    IEC 61010-1:2010+AMD1:2016 CSV Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements
    IEC TS 60479-2:2007 Effects of current on human beings and livestock - Part 2: Special aspects
    IEC 62368-1:2014 Audio/video, information and communication technology equipment - Part 1: Safety requirements
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