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  • BS EN 61557-8:2015

    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 Insulation monitoring devices for IT systems

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  30-06-2016

    Publisher:  British Standards Institution

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

    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

    Abstract - (Show below) - (Hide below)

    Defines the requirements for insulation monitoring devices (IMD) which permanently monitor the insulation resistance R[F] to earth of unearthed a.c. IT systems, of a.c. IT systems with galvanically connected d.c. circuits having nominal voltages up to 1000 V a.c., as well as of unearthed d.c. IT systems with voltages up to 1500 V d.c. independent from the method of measuring.

    Scope - (Show below) - (Hide below)

    This part of IEC61557 specifies the requirements for insulation monitoring devices (IMD) which permanently monitor the insulation resistance R F to earth of unearthed a.c. IT systems, of a.c. IT systems with galvanically connected d.c. circuits having nominal voltages up to 1000V a.c., as well as of unearthed d.c. IT systems with voltages up to 1500V d.c. independent from the method of measuring. IT systems are described in IEC60364‑4‑41 amongst other literature. Additional data for the selection of devices in other standards should be noted. NOTE Various standards specify the use of IMDs in IT systems. In such cases, the objective of the equipment is to signal a drop in insulation resistance R F below a minimum limit. IMDs according to this part of IEC61557 can also be used for de-energized TT, TN and IT systems or appliances.

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

    Committee PEL/85
    Development Note Supersedes 95/200309 DC. (09/2005) Supersedes 04/30125208 DC. (11/2007) Supersedes 12/30274733 DC. (02/2015)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

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

    BS 7671(2008) : 2018 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
    BS 7671(2008) : 2008 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS

    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 - Part 3: Classification of groups of environmental parameters and their severities - Section 1: 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 - Part 5-4: 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 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
    IEC 60691:2015 Thermal-links - Requirements and application guide
    IEC 60721-3-2:1997 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 2: Transportation
    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
    HD 60364-7-712:2016 Low-voltage electrical installations - Part 7-712: Requirements for special installations or locations - Photovoltaic (PV) systems
    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 1 000 V a.c. and 1 500 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 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 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
    EN 60721-3-2:1997 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 2: 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 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 60721-3-1:1997 Classification of environmental conditions - Part 3 Classification of groups of environmental parameters and their severities - Section 1: 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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