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  • HD 60364-4-43:2010

    Current The latest, up-to-date edition.

    Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent

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    Published date:  26-03-2010

    Publisher:  European Committee for Standards - Electrical

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

    FOREWORD
    43 Protection against overcurrent
    431 Requirements according to the nature of the circuits
    432 Nature of protective devices
    433 Protection against overload current
    434 Protection against short-circuit currents
    435 Coordination of overload and short-circuit protection
    436 Limitation of overcurrent by characteristics of supply
    Annex A (informative) Protection of conductors in parallel
                          against overcurrent
    Annex B (informative) Conditions 1 and 2 of 433.1
    Annex C (informative) Position or omission of devices for
                          overload protection
    Annex D (informative) Position or omission of devices for
                          short-circuit protection
    Annex E (informative) List of notes concerning certain countries
    Annex ZA (normative) Normative references to international
                         publications with their corresponding
                         European publications
    Annex ZB (normative) Special national conditions
    Bibliography

    Abstract - (Show below) - (Hide below)

    IEC 60364-4-43:2008 provides requirements for the protection of live conductors from the effects of overcurrents. IEC 60364-4-43:2008 describes how live conductors are protected by one or more devices for the automatic disconnection of the supply in the event of overload (Clause 433) and short-circuit (Clause 434) except in cases where the overcurrent is limited in accordance with Clause 436 or where the conditions described in 433.3 (omission of devices for protection against overload) or 434.3 (omission of devices for protection against short-circuit) are met. Coordination of overload protection and short-circuit protection is also covered (Clause 435). This third edition cancels and replaces the second edition, published in 2001, and constitutes a technical revision. The main changes with respect to the previous edition are: - Introduction of new informative Annexes B, C and D. - Information concerning flexible cables added to Scope. - Requirements added for overload detection for the neutral conductor for harmonic currents. - Requirement that devices for protection against short-circuit current be capable of making as well as breaking short-circuit current added. - Information added to clarify protection against overload current. - Requirements where devices for protection against overload need not be provided expanded. - Requirements where devices for protection against short-circuit need not be provided expanded. - Requirements for short-circuit current ratings of busbar trunking systems added. The contents of the corrigendum of October 2008 have been included in this copy.

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

    Development Note Supersedes HD 384.4.43. (04/2010) Supersedes HD 384.4.473. (03/2013)
    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
    HD 60364-7-708:2017 Low-voltage electrical installations - Part 7-708: Requirements for special installations or locations - Caravan parks, camping parks and similar locations
    S.R. HD 60364-5-557:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-557: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - AUXILIARY CIRCUITS
    I.S. HD 60364-5-559:2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-559: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - LUMINAIRES AND LIGHTING INSTALLATIONS (IEC 60364-5-55:2011 (MOD))
    I.S. HD 60364-7-715:2005 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-715: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - EXTRA-LOW-VOLTAGE LIGHTING INSTALLATIONS (IEC 60364-7-715:2011 (MOD))
    S.R. HD 60364-7-715:2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-715: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - EXTRA-LOW-VOLTAGE LIGHTING INSTALLATIONS
    I.S. EN 1648-2:2018 LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 2: MOTOR CARAVANS
    I.S. EN IEC 62485-2:2018 SAFETY REQUIREMENTS FOR SECONDARY BATTERIES AND BATTERY INSTALLATIONS - PART 2: STATIONARY BATTERIES
    UNI EN 1648-2 : 2012 LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 2: MOTOR CARAVANS
    S.R. HD 60364-7-709:2009 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-709: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MARINAS AND SIMILAR LOCATIONS
    I.S. EN 1648-1:2018 LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 1: CARAVANS
    CLC/TR 60269-5:2011 Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses
    BS 7671(2008) : 2018 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
    HD 60364-5-534:2016 Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Isolation, switching and control - Clause 534: Devices for protection against transient overvoltages
    EN IEC 62485-2:2018 Safety requirements for secondary batteries and battery installations - Part 2: Stationary batteries
    HD 60364-5-557:2013/A11:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-557: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - AUXILIARY CIRCUITS
    HD 60364-5-559:2012/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-559: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - LUMINAIRES AND LIGHTING INSTALLATIONS
    12/30235292 DC : 0 BS EN 50343 - RAILWAY APPLICATIONS - ROLLING STOCK - RULES FOR INSTALLATION OF CABLING
    17/30354245 DC : 0 BS EN 1648-1 - LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 1: CARAVANS
    S.R. HD 60364-5-534:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - ISOLATION, SWITCHING AND CONTROL - CLAUSE 534: DEVICES FOR PROTECTION AGAINST TRANSIENT OVERVOLTAGES
    17/30354248 DC : 0 BS EN 1648-2 - LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 2: MOTOR CARAVANS
    UNE-HD 60364-5-56:2010 Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services
    VDI 2166 Blatt 2:2015-10 Planning of electrical installations in buildings - Advice for electric mobility
    HD 60364-7-709:2009/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-709: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MARINAS AND SIMILAR LOCATIONS
    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))
    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. HD 60364-5-56:2010 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-56: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SAFETY SERVICES (IEC 60364-5-56:2009 (EQV))
    S.R. HD 60364-7-708:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-708: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - CARAVAN PARKS, CAMPING PARKS AND SIMILAR LOCATIONS
    PREN 1648-2 : DRAFT 2017 LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 2: MOTOR CARAVANS
    UNE-HD 60364-7-710:2014 Low-voltage electrical installations - Part 7-710: Requirements for special installations or locations - Medical locations
    UNE-HD 60364-5-53:2016 Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Switchgear and controlgear
    PREN 1648-1 : DRAFT 2017 LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 1: CARAVANS
    HD 60364-5-56:2010/A12:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-56: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SAFETY SERVICES
    S.R. HD 60364-5-53:2015 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    S.R. HD 60364-5-559:2012 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-559: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - LUMINAIRES AND LIGHTING INSTALLATIONS
    UNI EN 1648-1 : 2012 LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 1: CARAVANS
    S.R. CLC/TR 60269-5:2011 LOW-VOLTAGE FUSES - PART 5: GUIDANCE FOR THE APPLICATION OF LOW-VOLTAGE FUSES
    I.S. HD 60364-7-708:2009 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-708: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - CARAVAN PARKS, CAMPING PARKS AND SIMILAR LOCATIONS
    I.S. 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
    S.R. CLC/TR 50480:2011 DETERMINATION OF CROSS-SECTIONAL AREA OF CONDUCTORS AND SELECTION OF PROTECTIVE DEVICES
    UNE-EN 61009-1:2013 Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
    PD CLC/TR 50480:2011 Determination of cross-sectional area of conductors and selection of protective devices
    UNE-HD 60364-5-534:2016 Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Isolation, switching and control - Clause 534: Devices for protection against transient overvoltages
    BS EN 60204-33:2011 Safety of machinery. Electrical equipment of machines Requirements for semiconductor fabrication equipment
    BS EN 61009-1 : 2012 RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS WITH INTEGRAL OVERCURRENT PROTECTION FOR HOUSEHOLD AND SIMILAR USES (RCBOS) - PART 1: GENERAL RULES
    EN 61009-1:2012/A12:2016 RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS WITH INTEGRAL OVERCURRENT PROTECTION FOR HOUSEHOLD AND SIMILAR USES (RCBOS) - PART 1: GENERAL RULES
    EN 1648-1:2018 Leisure accommodation vehicles - 12 V direct current extra low voltage electrical installations - Part 1: Caravans
    EN 1648-2:2018 Leisure accommodation vehicles - 12 V direct current extra low voltage electrical installations - Part 2: Motor caravans
    UNE-HD 60364-7-709:2011 Low-voltage electrical installations -- Part 7-709: Requirements for special installations or locations - Marinas and similar locations
    I.S. HD 50573-5-57:2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    I.S. HD 60364-7-709:2009 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-709: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MARINAS AND SIMILAR LOCATIONS (IEC 60364-7-709:2007 (MOD))
    UNE-HD 60364-7-708:2018 Low-voltage electrical installations - Part 7-708: Requirements for special installations or locations - Caravan parks, camping parks and similar locations
    S.R. HD 60364-5-56:2010 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-56: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SAFETY SERVICES
    HD 50573-5-57:2014 Co-ordination of electrical equipment for protection, isolation, switching and control
    I.S. EN 61009-1:2012 RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS WITH INTEGRAL OVERCURRENT PROTECTION FOR HOUSEHOLD AND SIMILAR USES (RCBOS) - PART 1: GENERAL RULES
    I.S. EN 60204-33:2011 SAFETY OF MACHINERY - ELECTRICAL EQUIPMENT OF MACHINES - PART 33: REQUIREMENTS FOR SEMICONDUCTOR FABRICATION EQUIPMENT
    HD 60364-7-710:2012/AC:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-710: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MEDICAL LOCATIONS
    HD 60364-5-53:2015/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    BS 7671(2008) : 2008 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
    CLC/TR 50480:2011 Determination of cross-sectional area of conductors and selection of protective devices
    HD 60364-7-715:2012/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-715: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - EXTRA-LOW-VOLTAGE LIGHTING INSTALLATIONS
    EN 60204-33:2011 Safety of machinery - Electrical equipment of machines - Part 33: Requirements for semiconductor fabrication equipment
    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
    UNE-HD 60364-5-557:2014 Low-voltage electrical installations - Part 5-557: Selection and erection of electrical equipment - Auxiliary circuits
    UNE-HD 60364-7-715:2013 Low-voltage electrical installations - Part 7-715: Requirements for special installations or locations - Extra-low-voltage lighting installations
    UNE-HD 60364-5-551:2013 Low-voltage electrical installations -- Part 5-55: Selection and erection of electrical equipment - Other equipment -- Clause 551: Low-voltage generating sets

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

    IEC 60287-1-3:2002 Electric cables - Calculation of the current rating - Part 1-3: Current rating equations (100 % load factor) and calculation of losses - Current sharing between parallel single-core cables and calculation of circulating current losses
    IEC 60364-5-54:2011 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
    IEC 60947-6-2:2002+AMD1:2007 CSV Low-voltage switchgear and controlgear - Part 6-2: Multiple function equipment - Control and protective switching devices (or equipment) (CPS)
    IEC 60269-4:2009+AMD1:2012+AMD2:2016 CSV Low-voltage fuses - Part 4: Supplementary requirements forfuse-links for the protection of semiconductor devices
    IEC 60724:2000+AMD1:2008 CSV Short-circuit temperature limits of electric cables with rated voltages of 1 kV (Um = 1,2 kV) and 3 kV (Um = 3,6 kV)
    IEC 60947-4-1:2009+AMD1:2012 CSV Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
    IEC 60364-4-41:2005+AMD1:2017 CSV Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock
    IEC 60439-2:2000+AMD1:2005 CSV Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)
    IEC 60269-2:2013+AMD1:2016 CSV Low-voltage fuses - Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) - Examples of standardized systems of fuses A to K
    HD 60364-4-41:2017/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-41: PROTECTION FOR SAFETY - PROTECTION AGAINST ELECTRIC SHOCK
    HD 60364-5-54:2011/A11:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
    IEC 60269-1:2006+AMD1:2009+AMD2:2014 CSV Low-voltage fuses - Part 1: General requirements
    EN 60947-1:2007/A2:2014 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: GENERAL RULES (IEC 60947-1:2007/A2:2014)
    EN 60947-3:2009/A2:2015 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 3: SWITCHES, DISCONNECTORS, SWITCH-DISCONNECTORS AND FUSE-COMBINATION UNITS (IEC 60947-3:2008/A2:2015)
    EN 60269-4:2009/A2:2016 LOW-VOLTAGE FUSES - PART 4: SUPPLEMENTARY REQUIREMENTS FOR FUSE-LINKS FOR THE PROTECTION OF SEMICONDUCTOR DEVICES (IEC 60269-4:2009/A2:2016)
    EN 60947-4-1 : 2010 AMD 1 2012 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 4-1: CONTACTORS AND MOTOR-STARTERS - ELECTROMECHANICAL CONTACTORS AND MOTOR-STARTERS (IEC 60947-4-1:2009/A1:2012)
    IEC 60269-3:2010+AMD1:2013 CSV Low-voltage fuses - Part 3: Supplementary requirements for fuses foruse by unskilled persons (fuses mainly for household or similar applications) - Examples of standardized systems of fuses A to F
    IEC 60947-1:2007+AMD1:2010+AMD2:2014 CSV Low-voltage switchgear and controlgear - Part 1: General rules
    HD 60269-2:2013 Low-voltage fuses - Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) - Examples of standardized systems of fuses A to K
    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 60947-3:2008+AMD1:2012+AMD2:2015 CSV Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units
    IEC 60947-2:2016 Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
    EN 60947-2:2017 Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
    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 60269-3:2010/A1:2013 LOW-VOLTAGE FUSES - PART 3: SUPPLEMENTARY REQUIREMENTS FOR FUSES FOR USE BY UNSKILLED PERSONS (FUSES MAINLY FOR HOUSEHOLD AND SIMILAR APPLICATIONS) - EXAMPLES OF STANDARDIZED SYSTEMS OF FUSES A TO F
    EN 60439-2:2000/A1:2005 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 2: PARTICULAR REQUIREMENTS FOR BUSBAR TRUNKING SYSTEMS (BUSWAYS)
    IEC 60364-5-52:2009 Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems
    EN 60269-1:2007/A2:2014 LOW-VOLTAGE FUSES - PART 1: GENERAL REQUIREMENTS (IEC 60269-1:2006/A2:2014)
    EN 60947-6-2:2003/A1:2007 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 6-2: MULTIPLE FUNCTION EQUIPMENT - CONTROL AND PROTECTIVE SWITCHING DEVICES (OR EQUIPMENT) (CPS)
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