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  • EN 61557-8:2015/AC:2016-06

    Current The latest, up-to-date edition.

    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 8: Insulation monitoring devices for IT systems

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    Published date:  03-06-2016

    Publisher:  European Committee for Standards - Electrical

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

    FOREWORD
    1 Scope
    2 Normative references
    3 Terms, definitions and abbreviations
    4 Requirements
    5 Marking and operating instructions
    6 Tests
    7 Overview of requirements and tests for IMDs
    Annex A (normative) - Medical insulation monitoring devices
            (MED-IMD)
    Annex B (informative) - Monitoring of overload current and
            over-temperature
    Annex C (normative) - Insulation monitoring devices for photovoltaic
            systems (PV-IMD)
    Annex D (normative) - Insulation monitoring function of a photovoltaic
            inverter (PV-IMF) or in a charge controller
    Bibliography
    Annex ZA (normative) - Normative references to
             international publications with
             their corresponding European publications

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

    Committee TC 85X
    Document Type Standard
    Publisher European Committee for Standards - Electrical
    Status Current
    Supersedes

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

    UNE-HD 50573.5.57:2014 Co-ordination of electrical equipment for protection, isolation, switching and control
    EN 62020:1998/A1:2005 ELECTRICAL ACCESSORIES - RESIDUAL CURRENT MONITORS FOR HOUSEHOLD AND SIMILAR USES (RCMS)
    BS EN 61851-23 : 2014 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - PART 23: DC ELECTRIC VEHICLE CHARGING STATION (IEC 61851-23:2014)
    I.S. HD 60364-7-710:2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-710: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MEDICAL LOCATIONS (IEC 60364-7-710:2002 (MOD))
    14/30316181 DC : 0 BS EN 50628 - ERECTION OF ELECTRICAL INSTALLATIONS IN UNDERGROUND MINES
    I.S. HD 50573-5-57:2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    BS EN 62020 : 1999 ELECTRICAL ACCESSORIES - RESIDUAL CURRENT MONITORS FOR HOUSEHOLD AND SIMILAR USES (RCMS)
    BS EN 61557-1:2007 (published 2007-06) Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring or monitoring of protective measures General requirements
    UNE-EN 50502:2016 Railway applications - Rolling stock - Electric equipment in trolley buses - Safety requirements and current collection systems
    NF EN 62020 : 1999 AMD 1 2005 ELECTRICAL ACCESSORIES - RESIDUAL CURRENT MONITORS FOR HOUSEHOLD AND SIMILAR USES (RCMS)
    I.S. EN 50628:2016 ERECTION OF ELECTRICAL INSTALLATIONS IN UNDERGROUND MINES
    EN 61326-2-4 : 2013 ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS - PART 2-4: PARTICULAR REQUIREMENTS - TEST CONFIGURATIONS, OPERATIONAL CONDITIONS AND PERFORMANCE CRITERIA FOR INSULATION MONITORING DEVICES ACCORDING TO IEC 61557-8 AND FOR EQUIPMENT FOR INSULATION FAULT LOCATION ACCORDING TO IEC 61557-9 (IEC 61326-2-4:2012)
    S.R. HD 60364-5-557:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-557: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - AUXILIARY CIRCUITS
    BS EN 50502 : 2015 RAILWAY APPLICATIONS - ROLLING STOCK - ELECTRIC EQUIPMENT IN TROLLEY BUSES - SAFETY REQUIREMENTS AND CURRENT COLLECTION SYSTEMS
    S.R. HD 60364-5-53:2015 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    HD 60364-7-722 : 2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-722: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - SUPPLIES FOR ELECTRIC VEHICLES (IEC 60364-7-722:2015, MODIFIED)
    I.S. EN 61326-2-4:2013 ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS - PART 2-4: PARTICULAR REQUIREMENTS - TEST CONFIGURATIONS, OPERATIONAL CONDITIONS AND PERFORMANCE CRITERIA FOR INSULATION MONITORING DEVICES ACCORDING TO IEC 61557-8 AND FOR EQUIPMENT FOR INSULATION FAULT LOCATION ACCORDING TO IEC 61557-9 (IEC 61326-2-4:2012 (EQV))
    S.R. HD 60364-5-551:2010 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-55: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - OTHER EQUIPMENT - CLAUSE 551: LOW-VOLTAGE GENERATING SETS
    I.S. EN 50502:2015 RAILWAY APPLICATIONS - ROLLING STOCK - ELECTRIC EQUIPMENT IN TROLLEY BUSES - SAFETY REQUIREMENTS AND CURRENT COLLECTION SYSTEMS
    I.S. EN 61557-15:2014 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 15: FUNCTIONAL SAFETY REQUIREMENTS FOR INSULATION MONITORING DEVICES IN IT SYSTEMS AND EQUIPMENT FOR INSULATION FAULT LOCATION IN IT SYSTEMS
    I.S. EN 61557-1:2007 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 1: GENERAL REQUIREMENTS
    PREN 50628 : DRAFT 2014 ERECTION OF ELECTRICAL INSTALLATIONS IN UNDERGROUND MINES
    S.R. HD 60364-7-712:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-712: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - PHOTOVOLTAIC (PV) SYSTEMS
    I.S. EN 61851-23:2014 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - PART 23: DC ELECTRIC VEHICLE CHARGING STATION
    CEI EN 61557-1 : 2008 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 1: GENERAL REQUIREMENTS
    HD 50573-5-57 : 2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    CEI EN 61326-2-4 : 2014 ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS - PART 2-4: PARTICULAR REQUIREMENTS - TEST CONFIGURATIONS, OPERATIONAL CONDITIONS AND PERFORMANCE CRITERIA FOR INSULATION MONITORING DEVICES ACCORDING TO IEC 61557-8 AND FOR EQUIPMENT FOR INSULATION FAULT LOCATION ACCORDING TO IEC 61557-9
    BS EN 61326-2-4 : 2013 ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS - PART 2-4: PARTICULAR REQUIREMENTS - TEST CONFIGURATIONS, OPERATIONAL CONDITIONS AND PERFORMANCE CRITERIA FOR INSULATION MONITORING DEVICES ACCORDING TO IEC 61557-8 AND FOR EQUIPMENT FOR INSULATION FAULT LOCATION ACCORDING TO IEC 61557-9 (IEC 61326-2-4:2012)
    S.R. HD 60364-7-722:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-722: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - SUPPLIES FOR ELECTRIC VEHICLES
    I.S. HD 60364-7-717:2010 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-717: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MOBILE OR TRANSPORTABLE UNITS
    I.S. EN 61557-9:2015 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 9: EQUIPMENT FOR INSULATION FAULT LOCATION IN IT SYSTEMS
    BS EN 50628 : 2016 ERECTION OF ELECTRICAL INSTALLATIONS IN UNDERGROUND MINES
    BS EN 61557-9 : 2015 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 9: EQUIPMENT FOR NSULATION FAULT LOCATION IN IT SYSTEMS (IEC 61557-9:2014)
    BS EN 61557-15:2014 (published 2014-05) 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 Functional safety requirements for insulation monitoring devices in IT systems and equipment for insulation fault location in IT systems
    UNE-EN 61851-23:2015 Electric vehicle conductive charging system - Part 23: DC electric vehicle charging station
    UNE-HD 60364-5-53:2016 Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear
    EN 50502:2015 RAILWAY APPLICATIONS - ROLLING STOCK - ELECTRIC EQUIPMENT IN TROLLEY BUSES - SAFETY REQUIREMENTS AND CURRENT COLLECTION SYSTEMS
    HD 60364-7-717:2010/AC:2014 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-717: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MOBILE OR TRANSPORTABLE UNITS
    EN 61557-15 : 2014 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 15: FUNCTIONAL SAFETY REQUIREMENTS FOR INSULATION MONITORING DEVICES IN IT SYSTEMS AND EQUIPMENT FOR INSULATION FAULT LOCATION IN IT SYSTEMS (IEC 61557-15:2014)
    HD 60364-5-557:2013/A11:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-557: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - AUXILIARY CIRCUITS
    HD 60364-7-710:2012/AC:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-710: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MEDICAL LOCATIONS
    EN 61851-23:2014/AC:2016-06 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - PART 23: DC ELECTRIC VEHICLE CHARGING STATION (IEC 61851-23:2014/COR1:2016)
    HD 60364-5-53:2015/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    OVE/ONORM EN 62020 : AMD 1 2006 ELECTRICAL ACCESSORIES - RESIDUAL CURRENT MONITORS FOR HOUSEHOLD AND SIMILAR USES (RCMS)
    EN 61557-9:2015/AC:2017-02 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 9: EQUIPMENT FOR INSULATION FAULT LOCATION IN IT SYSTEMS (IEC 61557-9:2014/COR2:2017)
    HD 60364-7-712 : 2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-712: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - PHOTOVOLTAIC (PV) SYSTEMS
    HD 60364-5-551:2010/A11:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-55: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - OTHER EQUIPMENT - CLAUSE 551: LOW-VOLTAGE GENERATING SETS
    EN 50628:2016 ERECTION OF ELECTRICAL INSTALLATIONS IN UNDERGROUND MINES
    EN 61557-1 : 2007 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 1: GENERAL REQUIREMENTS

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

    IEC 60947-5-4:2002 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 5-4: CONTROL CIRCUIT DEVICES AND SWITCHING ELEMENTS - METHOD OF ASSESSING THE PERFORMANCE OF LOW-ENERGY CONTACTS - SPECIAL TESTS
    EN 60027-7 : 2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    IEC 60364-7-712:2017 Low voltage electrical installations - Part 7-712: Requirements for special installations or locations - Solar photovoltaic (PV) power supply systems
    EN 60721-3-1 : 1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - STORAGE
    IEC 61326-2-4:2012 ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS - PART 2-4: PARTICULAR REQUIREMENTS - TEST CONFIGURATIONS, OPERATIONAL CONDITIONS AND PERFORMANCE CRITERIA FOR INSULATION MONITORING DEVICES ACCORDING TO IEC 61557-8 AND FOR EQUIPMENT FOR INSULATION FAULT LOCATION ACCORDING TO IEC 61557-9
    IEC 60364-7-710:2002 Electrical installations of buildings - Part 7-710: Requirements for special installations or locations - Medical locations
    IEC 60068-2-27:2008 Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock
    IEC 60364-4-41:2005+AMD1:2017 CSV Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock
    EN 60068-2-1 : 2007 ENVIRONMENTAL TESTING - PART 2-1: TESTS - TEST A: COLD
    EN 60068-2-2:2007 ENVIRONMENTAL TESTING - PART 2-2: TESTS - TEST B: DRY HEAT
    HD 60364-4-41:2017/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-41: PROTECTION FOR SAFETY - PROTECTION AGAINST ELECTRIC SHOCK
    IEC 60947-5-1 : 4.0 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 5-1: CONTROL CIRCUIT DEVICES AND SWITCHING ELEMENTS - ELECTROMECHANICAL CONTROL CIRCUIT DEVICES
    EN 60947-5-4 : 2003 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - CONTROL CIRCUIT DEVICES AND SWITCHING ELEMENTS - METHOD OF ASSESSING THE PERFORMANCE OF LOW-ENERGY CONTACTS - SPECIAL TESTS
    EN 61810-2 : 2017 ELECTROMECHANICAL ELEMENTARY RELAYS - PART 2: RELIABILITY (IEC 61810-2:2017)
    IEC 61010-2-030:2017 Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 2-030: Particular requirements for equipment having testing or measuring circuits
    IEC 61557-1:2007 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 1: General requirements
    IEC 61810-2:2017 Electromechanical elementary relays - Part 2: Reliability
    EN 60068-2-27 : 2009 ENVIRONMENTAL TESTING - PART 2-27: TESTS - TEST EA AND GUIDANCE: SHOCK
    EN 55011:2016/A1:2017 INDUSTRIAL, SCIENTIFIC AND MEDICAL EQUIPMENT - RADIO-FREQUENCY DISTURBANCE CHARACTERISTICS - LIMITS AND METHODS OF MEASUREMENT (CISPR 11:2015/A1:2016)
    IEC 60691:2015 Thermal-links - Requirements and application guide
    IEC 60721-3-2:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3-2: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - TRANSPORTATION AND HANDLING
    IEC 60068-2-2:2007 Environmental testing - Part 2-2: Tests - Test B: Dry heat
    EN 60664-1 : 2007 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS - PART 1: PRINCIPLES, REQUIREMENTS AND TESTS
    IEC 62109-2:2011 Safety of power converters for use in photovoltaic power systems - Part 2: Particular requirements for inverters
    EN 61557-1 : 2007 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 1: GENERAL REQUIREMENTS
    HD 60364-7-710:2012/AC:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-710: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MEDICAL LOCATIONS
    EN 62109-2 : 2011 SAFETY OF POWER CONVERTERS FOR USE IN PHOTOVOLTAIC POWER SYSTEMS - PART 2: PARTICULAR REQUIREMENTS FOR INVERTERS (IEC 62109-2:2011)
    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
    EN 60068-2-6 : 2008 ENVIRONMENTAL TESTING - PART 2-6: TESTS - TEST FC: VIBRATION (SINUSOIDAL)
    IEC 60664-3:2016 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS - PART 3: USE OF COATING, POTTING OR MOULDING FOR PROTECTION AGAINST POLLUTION
    CISPR 11:2015 RLV Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
    EN 61140 : 2016 PROTECTION AGAINST ELECTRIC SHOCK - COMMON ASPECTS FOR INSTALLATION AND EQUIPMENT (IEC 61140:2016)
    IEC 61557-9:2014 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 9: Equipment for insulation fault location in IT systems
    IEC 60068-2-1:2007 Environmental testing - Part 2-1: Tests - Test A: Cold
    EN 61010-1 : 2010 SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - PART 1: GENERAL REQUIREMENTS (IEC 61010-1:2010)
    EN 60721-3-2 : 1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - TRANSPORTATION
    IEC 61140:2016 Protection against electric shock - Common aspects for installation and equipment
    IEC 61010-1:2010+AMD1:2016 CSV Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 1: General requirements
    EN 61326-2-4 : 2013 ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL AND LABORATORY USE - EMC REQUIREMENTS - PART 2-4: PARTICULAR REQUIREMENTS - TEST CONFIGURATIONS, OPERATIONAL CONDITIONS AND PERFORMANCE CRITERIA FOR INSULATION MONITORING DEVICES ACCORDING TO IEC 61557-8 AND FOR EQUIPMENT FOR INSULATION FAULT LOCATION ACCORDING TO IEC 61557-9 (IEC 61326-2-4:2012)
    IEC 60664-1:2007 Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests
    IEC 60027-7:2010 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution
    EN 61557-9:2015/AC:2017-02 ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS UP TO 1000 V A.C. AND 1500 V D.C. - EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF PROTECTIVE MEASURES - PART 9: EQUIPMENT FOR INSULATION FAULT LOCATION IN IT SYSTEMS (IEC 61557-9:2014/COR2:2017)
    EN 60664-3 : 2017 INSULATION COORDINATION FOR EQUIPMENT WITHIN LOW-VOLTAGE SYSTEMS - PART 3: USE OF COATING, POTTING OR MOULDING FOR PROTECTION AGAINST POLLUTION (IEC 60664-3:2016)
    IEC 60721-3-1:1997 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - PART 3-1: CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - STORAGE
    EN 60721-3-3 : 95 AMD 2 97 CLASSIFICATION OF ENVIRONMENTAL CONDITIONS - CLASSIFICATION OF GROUPS OF ENVIRONMENTAL PARAMETERS AND THEIR SEVERITIES - STATIONARY USE AT WEATHER-PROTECTED LOCATIONS
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