• EN 60044-1:1999/A2:2003

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    INSTRUMENT TRANSFORMERS - PART 1: CURRENT TRANSFORMERS

    Available format(s): 

    Superseded date:  01-11-2012

    Language(s): 

    Published date:  12-01-2013

    Publisher:  European Committee for Standards - Electrical

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

    Foreword
    1 General
       1.1 Scope
       1.2 Normative references
    2 Definitions
       2.1 General definitions
       2.2 Additional definitions for measuring
            current transformers
       2.3 Additional definitions for protective
            current transformers
    3 Normal and special service conditions
       3.1 Normal service conditions
       3.2 Special service conditions
       3.3 System earthing
    4 Ratings
       4.1 Standard values of rated primary currents
       4.2 Standard values of rated secondary currents
       4.3 Rated continuous thermal current
       4.4 Standard values of rated output
       4.5 Short-time current ratings
       4.6 Limits of temperature rise
    5 Design requirements
       5.1 Insulation requirements
       5.2 Mechanical requirements
    6 Classification of tests
       6.1 Type tests
       6.2 Routine tests
       6.3 Special tests
    7 Type tests
       7.1 Short-time current tests
       7.2 Temperature-rise test
       7.3 Impulse tests on primary winding
       7.4 Wet test for outdoor type transformers
       7.5 Radio interference voltage measurements
    8 Routine tests
       8.1 Verification of terminal markings
       8.2 Power-frequency withstand tests on primary
            windings and partial discharge measurement
       8.3 Power-frequency withstand tests between
            sections of primary and secondary windings
            and on secondary windings
       8.4 Inter-turn overvoltage test
    9 Special tests
       9.1 Chopped impulse test on primary winding
       9.2 Measurement of capacitance and dielectric
            dissipation factor
       9.3 Mechanical tests
       9.4 Transmitted overvoltages measurement
    10 Markings
       10.1 Terminal markings - General rules
       10.2 Rating plate markings
    11 Additional requirements for measuring current
       transformers
       11.1 Accuracy class designation for measuring
            current transformers
       11.2 Limits of current error and phase
            displacement for measuring current
            transformers
       11.3 Extended current ratings
       11.4 Type tests for accuracy of measuring
            current transformers
       11.5 Routine tests for accuracy of measuring
            current transformers
       11.6 Instrument security current
       11.7 Marking of the rating plate of a
            measuring current transformer
    12 Additional requirements for protective current
       transformers
       12.1 Standard accuracy limit factors
       12.2 Accuracy classes for protective current
            transformer
       12.3 Limits of errors for protective current
            transformers
       12.4 Type and routine tests for current error
            and phase displacement of protective
            current transformers
       12.5 Type tests for composite error
       12.6 Routine tests for composite error
       12.7 Marking of the rating plate of a
            protective current transformer
    13 Additional requirements for class PR protective
       current transformers
       13.1 Standard accuracy limit factors
       13.2 Accuracy classes for class PR protective
            current transformers
       13.3 Limits or error for class PR protective
            current transformers
       13.4 Type and routine tests for current error
            and phase displacement of class PR
            protective current transformers
       13.5 Marking of rating plate of class PR current
            transformers
    14 Additional requirements for class PX protective
       current transformers
       14.1 Specification of performance for class
            PX protective current transformers
       14.2 Insulation requirements for class PX
            protective current transformers
       14.3 Type tests for class PX protective current
            transformers
       14.4 Routine tests for class PX protective
            current transformers
       14.5 Marking of rating plate of class
            PX current transformers
    Annex A (normative) - Protective current transformers
    Annex B (informative) - Multiple chopped impulse test
    Annex ZA (normative) - Normative references to
                            international publications
                            with their corresponding
                            European publications
    Figures
    Tables

    Abstract - (Show below) - (Hide below)

    Applicable to newly manufactured current transformers used with electrical measuring instruments and electrical protective devices at frequencies from 15Hz to 100 Hz. Also applicable to autotransformers, where appropriate.

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

    Committee TC 38X
    Development Note Supersedes HD 553. (06/2001)
    Document Type Standard
    Publisher European Committee for Standards - Electrical
    Status Superseded
    Superseded By
    Supersedes

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

    BS EN 50152-1 : 2012 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 1: CIRCUIT-BREAKERS WITH NOMINAL VOLTAGE ABOVE 1 KV
    BS EN 61400-21:2008 Wind turbines Measurement and assessment of power quality characteristics of grid connected wind turbines
    CEI EN 60044-8 : 2004 INSTRUMENT TRANSFORMERS - PART 8: ELECTRONIC CURRENT TRASFORMERS
    UNE-EN 50152-2:2013 Railway applications - Fixed installations - Particular requirements for alternating current switchgear - Part 2: Disconnectors, earthing switches and switches with nominal voltage above 1 kV
    I.S. EN 50327:2003 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - HARMONISATION OF THE RATED VALUES FOR CONVERTER GROUPS AND TESTS ON CONVERTER GROUPS
    BS EN 60255-1 : 2010 MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 1: COMMON REQUIREMENTS
    CEI EN 62271-203 : 2013 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 203: GAS-INSULATED METAL-ENCLOSED SWITCHGEAR FOR RATED VOLTAGES ABOVE 52 KV
    CEI EN 62053-22 : 2003 ELECTRICITY METERING EQUIPMENT (A.C.) - PARTICULAR REQUIREMENTS - PART 22: STATIC METERS FOR ACTIVE ENERGY (CLASSES 0,2 S AND 0,5 S)
    CEI CLC/TR 50462 : 2009 RULES FOR THE DETERMINATION OF UNCERTAINTIES IN THE MEASUREMENT OF THE LOSSES ON POWER TRANSFORMERS AND REACTORS
    I.S. EN 50600-2-2:2014 INFORMATION TECHNOLOGY - DATA CENTRE FACILITIES AND INFRASTRUCTURES - PART 2-2: POWER DISTRIBUTION
    BS EN 45510-2-7 : 2002 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-7: ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    I.S. EN 60143-2:2013 SERIES CAPACITORS FOR POWER SYSTEMS - PART 2: PROTECTIVE EQUIPMENT FOR SERIES CAPACITOR BANKS (IEC 60143-2:2012 (EQV))
    BS PD CLC/TR 50579 : 2012 ELECTRICITY METERING EQUIPMENT (A.C.) - SEVERITY LEVELS, IMMUNITY REQUIREMENTS AND TEST METHODS FOR CONDUCTED DISTURBANCES IN THE FREQUENCY RANGE 2 KHZ - 150 KHZ
    BS EN 62271-205:2008 High-voltage switchgear and controlgear Compact switchgear assemblies for rated voltages above 52 kV
    BS EN 61036 : 1997 ALTERNATING CURRENT STATIC WATT-HOUR METERS FOR ACTIVE ENERGY (CLASSES 1 AND 2)
    11/30235280 DC : 0 BS EN 50152-1 - RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 1: CIRCUIT-BREAKERS WITH NOMINAL VOLTAGE ABOVE 1 KV
    CLC/TR 50579:2012 ELECTRICITY METERING EQUIPMENT (A.C.) - SEVERITY LEVELS, IMMUNITY REQUIREMENTS AND TEST METHODS FOR CONDUCTED DISTURBANCES IN THE FREQUENCY RANGE 2 KHZ - 150 KHZ
    BS EN 50327:2003 Railway applications. Fixed installations. Harmonisation of the rated values for converter groups and tests on converter groups
    BS EN 50463 : 2007 RAILWAY APPLICATIONS - ENERGY MEASUREMENT ON BOARD TRAINS
    11/30235283 DC : 0 BS EN 50152-2 - RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 2: DISCONNECTORS, EARTHING SWITCHES AND SWITCHES WITH NOMINAL VOLTAGE ABOVE 1 KV
    CEI UNI EN 45510-2-7 : 2006 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-7: ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    CLC/TR 50462 : 2008 RULES FOR THE DETERMINATION OF UNCERTAINTIES IN THE MEASUREMENT OF THE LOSSES ON POWER TRANSFORMERS AND REACTORS
    CEI EN 62052-11 : 2003 ELECTRICITY METERING EQUIPMENT (AC) - GENERAL REQUIREMENTS, TESTS AND TEST CONDITIONS - PART 11: METERING EQUIPMENT
    BS EN 60143-2:2013 Series capacitors for power systems Protective equipment for series capacitor banks
    BS EN 62271-203:2012 High-voltage switchgear and controlgear Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV
    UNE-EN 50152-1:2013 Railway applications - Fixed installations - Particular requirements for alternating current switchgear - Part 1: Circuit-breakers with nominal voltage above 1 kV
    UNE-EN 61557-12:2010 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures -- Part 12: Performance measuring and monitoring devices (PMD)
    DIN EN 45510-2-7:2003-12 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-7: ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    UNI CEI EN 45510-2-7 : 2011 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-7: ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    CEI EN 60143-2 : 2014 SERIES CAPACITORS FOR POWER SYSTEMS - PART 2: PROTECTIVE EQUIPMENT FOR SERIES CAPACITOR BANKS
    BS EN 60044-8:2002 Instrument transformers Electronic current transformers
    I.S. EN 60044-8:2002 INSTRUMENT TRANSFORMERS - PART 8: ELECTRONIC CURRENT TRANSFORMERS
    CEI EN 50470-1 : 2007 ELECTRICITY METERING EQUIPMENT (A.C.) - PART 1: GENERAL REQUIREMENTS, TESTS AND TEST CONDITIONS - METERING EQUIPMENT (CLASS INDEXES A, B AND C)
    CEI CLC/TR 50579 : 2013 ELECTRICITY METERING EQUIPMENT - SEVERITY LEVELS, IMMUNITY REQUIREMENTS AND TEST METHODS FOR CONDUCTED DISTURBANCES IN THE FREQUENCY RANGE 2 KHZ - 150 KHZ
    BS EN 50152-2 : 2012 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 2: DISCONNECTORS, EARTHING SWITCHES AND SWITCHES WITH NOMINAL VOLTAGE ABOVE 1 KV
    I.S. EN 62053-22:2003 ELECTRICITY METERING EQUIPMENT (A.C.) - PARTICULAR REQUIREMENTS - PART 22: STATIC METERS FOR ACTIVE ENERGY (CLASSES 0,2 S AND 0,5 S) (IEC 62053-22:2003/A1:2016/COR1:2018)
    I.S. EN 50152-1:2012 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 1: CIRCUIT-BREAKERS WITH NOMINAL VOLTAGE ABOVE 1 KV
    EN 62271-100 : 2009 AMD 2/COR 18 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 100: ALTERNATING-CURRENT CIRCUIT-BREAKERS (IEC 62271-100:2008/A2:2017/COR1:2018)
    BS EN 50470-1 : 2006 ELECTRICITY METERING EQUIPMENT (A.C.) - PART 1: GENERAL REQUIREMENTS, TESTS AND TEST CONDITIONS - METERING EQUIPMENT (CLASS INDEXES A, B AND C)
    I.S. EN 50470-1:2006 ELECTRICITY METERING EQUIPMENT (A.C.) - PART 1: GENERAL REQUIREMENTS, TESTS AND TEST CONDITIONS - METERING EQUIPMENT (CLASS INDEXES A, B AND C)
    PREN 50152-1 : DRAFT 2011 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 1: CIRCUIT-BREAKERS WITH NOMINAL VOLTAGE ABOVE 1 KV
    S.R. CLC/TR 50579:2012 ELECTRICITY METERING EQUIPMENT (A.C.) - SEVERITY LEVELS, IMMUNITY REQUIREMENTS AND TEST METHODS FOR CONDUCTED DISTURBANCES IN THE FREQUENCY RANGE 2 KHZ - 150 KHZ
    EN 50470-1:2006 ELECTRICITY METERING EQUIPMENT (A.C.) - PART 1: GENERAL REQUIREMENTS, TESTS AND TEST CONDITIONS - METERING EQUIPMENT (CLASS INDEXES A, B AND C)
    CEI EN 61400-21 : 2011 WIND TURBINES - PART 21: MEASUREMENT AND ASSESSMENT OF POWER QUALITY CHARACTERISTICS OF GRID CONNECTED WIND TURBINES
    I.S. EN 62271-100:2009 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 100: ALTERNATING-CURRENT CIRCUIT-BREAKERS
    BS EN 50600-2-2:2014 (published 2014-04) Information technology. Data centre facilities and infrastructures Power distribution
    I.S. EN 45510-2-7:2002 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-7: ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    I.S. EN 61036:1997 ALTERNATING CURRENT STATIC WATT-HOUR METERS FOR ACTIVE ENERGY (CLASSES 1 AND 2)
    CEI EN 60255-1 : 2011 MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 1: COMMON REQUIREMENTS
    PREN 50152-2 : DRAFT 2011 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 2: DISCONNECTORS, EARTHING SWITCHES AND SWITCHES WITH NOMINAL VOLTAGE ABOVE 1 KV
    CEI EN 62271-205 : 2012 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 205: COMPACT SWITCHGEAR ASSEMBLIES FOR RATED VOLTAGES ABOVE 52 KV
    I.S. EN 50152-2:2012 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 2: DISCONNECTORS, EARTHING SWITCHES AND SWITCHES WITH NOMINAL VOLTAGE ABOVE 1 KV
    CEI EN 50152-2 : 2013 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 2: DISCONNECTORS, EARTHING SWITCHES AND SWITCHES WITH NOMINAL VOLTAGE ABOVE 1 KV
    I.S. EN 61400-21:2008 WIND TURBINES - PART 21: MEASUREMENT AND ASSESSMENT OF POWER QUALITY CHARACTERISTICS OF GRID CONNECTED WIND TURBINES
    I.S. EN 60255-1:2010 MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 1: COMMON REQUIREMENTS
    I.S. EN 62271-203:2012 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 203: GAS-INSULATED METAL-ENCLOSED SWITCHGEAR FOR RATED VOLTAGES ABOVE 52 KV (IEC 62271-203:2011 (EQV))
    S.R. CLC/TR 50462:2008 RULES FOR THE DETERMINATION OF UNCERTAINTIES IN THE MEASUREMENT OF THE LOSSES ON POWER TRANSFORMERS AND REACTORS
    I.S. EN 62271-205:2008 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 205: COMPACT SWITCHGEAR ASSEMBLIES FOR RATED VOLTAGES ABOVE 52 KV
    I.S. EN 50463:2007 RAILWAY APPLICATIONS - ENERGY MEASUREMENT ON BOARD TRAINS
    UNE-EN 62271-203:2013 High-voltage switchgear and controlgear - Part 203: Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV
    EN 50600-2-2 : 2014 INFORMATION TECHNOLOGY - DATA CENTRE FACILITIES AND INFRASTRUCTURES - PART 2-2: POWER DISTRIBUTION
    EN 62271-205:2008/corrigendum:2008 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 205: COMPACT SWITCHGEAR ASSEMBLIES FOR RATED VOLTAGES ABOVE 52 KV
    EN 62053-22:2003/A1:2017/AC:2018-05 ELECTRICITY METERING EQUIPMENT (A.C.) - PARTICULAR REQUIREMENTS - PART 22: STATIC METERS FOR ACTIVE ENERGY (CLASSES 0,2 S AND 0,5 S) (IEC 62053-22:2003/A1:2016/COR1:2018)
    EN 61036:1996/A1:2000 ALTERNATING CURRENT STATIC WATT-HOUR METERS FOR ACTIVE ENERGY (CLASSES 1 AND 2)
    EN 50327 : 2003 AMD 1 2005 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - HARMONISATION OF THE RATED VALUES FOR CONVERTER GROUPS AND TESTS ON CONVERTER GROUPS
    EN 50152-2:2012 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 2: DISCONNECTORS, EARTHING SWITCHES AND SWITCHES WITH NOMINAL VOLTAGE ABOVE 1 KV
    EN 61400-21:2008 WIND TURBINES - PART 21: MEASUREMENT AND ASSESSMENT OF POWER QUALITY CHARACTERISTICS OF GRID CONNECTED WIND TURBINES
    EN 60255-1 : 2010 MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 1: COMMON REQUIREMENTS
    EN 60143-2:2013 SERIES CAPACITORS FOR POWER SYSTEMS - PART 2: PROTECTIVE EQUIPMENT FOR SERIES CAPACITOR BANKS (IEC 60143-2:2012)
    EN 62271-203:2012 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 203: GAS-INSULATED METAL-ENCLOSED SWITCHGEAR FOR RATED VOLTAGES ABOVE 52 KV (IEC 62271-203:2011)
    EN 50152-1 : 2012 AMD 1 2013 RAILWAY APPLICATIONS - FIXED INSTALLATIONS - PARTICULAR REQUIREMENTS FOR ALTERNATING CURRENT SWITCHGEAR - PART 1: CIRCUIT-BREAKERS WITH NOMINAL VOLTAGE ABOVE 1 KV
    EN 60044-8 : 2002 INSTRUMENT TRANSFORMERS - PART 8: ELECTRONIC CURRENT TRANSFORMERS
    EN 50463 : 2007 RAILWAY APPLICATIONS - ENERGY MEASUREMENT ON BOARD TRAINS
    EN 45510-2-7 : 2002 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-7: ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR

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

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    IEC 60721-1:1990+AMD1:1992+AMD2:1995 CSV Classification of environmental conditions - Part 1: Environmental parameters and their severities
    IEC 60028:1925 INTERNATIONAL STANDARD OF RESISTANCE FOR COPPER
    EN 60721-3-1:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - STORAGE
    HD 478.2.3 : 200S1 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - AIR PRESSURE
    HD 478.2.2 : 200S1 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - PRECIPITATION AND WIND
    IEC 60721-3-9:1993 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 9: Microclimates inside products
    HD 478.2.6 : 200S1 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - EARTHQUAKE VIBRATION AND SHOCK
    IEC 60721-2-7:1987 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 2: ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - FAUNA AND FLORA
    EN 60721-3-9:1993/A1:1995 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - SECTION 9: MICROCLIMATES INSIDE PRODUCTS
    IEC 60599:2015 Mineral oil-filled electrical equipment in service - Guidance on the interpretation of dissolved and free gases analysis
    EN 60721-3-5 : 1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - SECTION 5: GROUND VEHICLE INSTALLATIONS
    IEC 60721-3-7:1995+AMD1:1996 CSV Classification of environmental conditions - Part 3-7: Classification of groups of environmental parameters and their severities - Portable and non-stationary use
    IEC 60721-3-5:1997 Classification of environmental conditions - Part 3: Classificationof groups of environmental parameters and their severities -Section 5: Ground vehicle installations
    IEC 60721-2-5:1991 Classification of environmental conditions - Part 2: Environmental conditions appearing in nature - Section 5: Dust, sand, salt mist
    IEC 60559:1989 BINARY FLOATING POINT ARITHMETIC FOR MICROPROCESSOR SYSTEMS
    EN 60721-3-0 : 1993 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - INTRODUCTION
    HD 478.2.1 : 200S1 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - TEMPERATURE AND HUMIDITY
    IEC 60567:2011 Oil-filled electrical equipment - Sampling of gases and analysis of free and dissolved gases - Guidance
    EN 60721-3-7:1995/A1:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - SECTION 7: PORTABLE AND NON-STATIONARY USE
    HD 588.1 : S1 AMD 1 HIGH VOLTAGE TEST TECHNIQUES - GENERAL DEFINITIONS AND TEST REQUIREMENTS
    HD 472 S1:1989/AC:2013 NOMINAL VOLTAGES FOR LOW-VOLTAGE PUBLIC ELECTRICITY SUPPLY SYSTEMS
    EN 60044-6 : 1999 INSTRUMENT TRANSFORMERS - REQUIREMENTS FOR PROTECTIVE CURRENT TRANSFORMERS FOR TRANSIENT PERFORMANCE
    IEC 60085:2007 ELECTRICAL INSULATION - THERMAL EVALUATION AND DESIGNATION
    IEC 60721-2-1:2013 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 2-1: ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - TEMPERATURE AND HUMIDITY
    IEC 60721-2-2:2012 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 2-2: ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - PRECIPITATION AND WIND
    HD 478.2.4 : 200S1 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - SOLAR RADIATION AND TEMPERATURE
    IEC 60721-2-6:1990 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - EARTHQUAKE VIBRATION AND SHOCK
    IEC 60044-6:1992 Instrument transformers - Part 6: Requirements for protective current transformers for transient performance
    IEC 60121:1960 Recommendation for commercial annealed aluminium electrical conductor wire
    HD 566 : 200S1 THERMAL EVALUATION AND CLASSIFICATION OF ELECTRICAL INSULATION
    IEC 60721-3-0:1984+AMD1:1987 CSV CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - INTRODUCTION
    IEC 60721-3-2:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3-2: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - TRANSPORTATION AND HANDLING
    EN 60071-1:2006/A1:2010 INSULATION CO-ORDINATION - PART 1: DEFINITIONS, PRINCIPLES AND RULES
    IEC 60721-2-8:1994 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - FIRE EXPOSURE
    IEC 60050-321:1986 INTERNATIONAL ELECTROTECHNICAL VOCABULARY - INSTRUMENT TRANSFORMERS
    IEC 60721-3-3:1994+AMD1:1995+AMD2:1996 CSV Classification of environmental conditions - Part 3-3: Classification of groups of environmental parameters and their severities - Stationary use at weatherprotected locations
    HD 478.2.5 : 200S1 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - DUST, SAND, SALT MIST
    IEC 60721-2-4:1987+AMD1:1988 CSV CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 2-4: ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - SOLAR RADIATION AND TEMPERATURE
    HD 478.2.7 : 200S1 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - ENVIRONMENTAL CONDITIONS APPEARING IN NATURE - FAUNA AND FLORA
    EN 60721-1:1995/A2:1995 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 1: ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES
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    IEC 60721-3-6:1987 Classification of environmental conditions. Part 3: Classification of groups of environmental parameters and their severities. Ship environment
    EN 60721-3-4:1995/A1:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - SECTION 4: STATIONARY USE AT NON-WEATHER-PROTECTED LOCATIONS
    EN 60721-3-6:1993/A2:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - SHIP ENVIRONMENT
    EN 60567:2011 OIL-FILLED ELECTRICAL EQUIPMENT - SAMPLING OF GASES AND ANALYSIS OF FREE AND DISSOLVED GASES - GUIDANCE (IEC 60567:2011)
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