• IEC 60364-4-43:2008

    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:  13-08-2008

    Publisher:  International Electrotechnical Committee

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

    FOREWORD
    43 Protection against overcurrent
        430.1 Scope
        430.2 Normative references
        430.3 General requirements
    431 Requirements according to the nature of the circuits
        431.1 Protection of line conductors
        431.2 Protection of the neutral conductor
        431.3 Disconnection and reconnection of the neutral conductor
              in multi-phase systems
    432 Nature of protective devices
        432.1 Devices providing protection against both overload
              current and short-circuit current
        432.2 Devices ensuring protection against overload current only
        432.3 Devices ensuring protection against short-circuit
              current only
        432.4 Characteristics of protective devices
    433 Protection against overload current
        433.1 Coordination between conductors and overload protective
              devices
        433.2 Position of devices for overload protection
        433.3 Omission of devices for protection against overload
        433.4 Overload protection of conductors in parallel
    434 Protection against short-circuit currents
        434.1 Determination of prospective short-circuit currents
        434.2 Position of devices for short-circuit protection
        434.3 Omission of devices for protection against short-circuit
        434.4 Short-circuit protection of conductors in parallel
        434.5 Characteristics of short-circuit protective devices
    435 Coordination of overload and short-circuit protection
        435.1 Protection afforded by one device
        435.2 Protection afforded by separate devices
    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
    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)

    Committee TC 64
    Development Note Supersedes IEC 60364-4-473 (01/2002) Supersedes and renumbers IEC 364-4-43 (07/2004) Stability Date: 2018. (10/2012)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current
    Supersedes

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

    04/30116083 DC : DRAFT JUL 2004 IEC 62305-5 - PROTECTION AGAINST LIGHTNING - PART 5: SERVICES
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    03/305095 DC : DRAFT MAR 2003 IEC 62305-4 - PROTECTION AGAINST LIGHTNING - PART 4: ELECTRICAL AND ELECTRONIC SYSTEMS WITHIN STRUCTURES
    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
    NBR IEC 61851-21 : 2013 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - PART 21: ELETRIC VEHICLE REQUIREMENTS FOR CONDUCTIVE CONNECTION TO AN A.C/D.C SUPPLY
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    DIN EN ISO 17409 E : 2017 ELECTRICALLY PROPELLED ROAD VEHICLES - CONNECTION TO AN EXTERNAL ELECTRIC POWER SUPPLY - SAFETY REQUIREMENTS (ISO 17409:2015, CORRECTED VERSION 2015-12-15)
    NF EN 60519-7 : 2009 SAFETY IN ELECTROHEAT INSTALLATIONS - PART 7: PARTICULAR REQUIREMENTS FOR INSTALLATIONS WITH ELECTRON GUNS
    IEC 60364-4-41:2005+AMD1:2017 CSV Low voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock
    UNE-HD 50573.5.57:2014 Co-ordination of electrical equipment for protection, isolation, switching and control
    EN 61851-22 : 2002 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - AC ELECTRIC VEHICLE CHARGING STATION
    CEI EN 60519-7 : 2010 SAFETY IN ELECTROHEAT INSTALLATIONS - PART 7: PARTICULAR REQUIREMENTS FOR INSTALLATIONS WITH ELECTRON GUNS
    12/30235292 DC : 0 BS EN 50343 - RAILWAY APPLICATIONS - ROLLING STOCK - RULES FOR INSTALLATION OF CABLING
    BS EN 61851-22 : 2002 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - AC ELECTRIC VEHICLE CHARGING STATION
    S.R. CLC/TR 60269-5:2011 LOW-VOLTAGE FUSES - PART 5: GUIDANCE FOR THE APPLICATION OF LOW-VOLTAGE FUSES
    BS 7856(2017) : 2017 SPECIFICATION FOR SPECIAL DESIGN AND OTHER FEATURES OF ALTERNATING CURRENT WATTHOUR METERS FOR ACTIVE ENERGY FOR USE IN THE UK (ACCURACY CLASSES A AND B)
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    17/30354245 DC : 0 BS EN 1648-1 - LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 1: CARAVANS
    BS ISO 17409 : 2015 ELECTRICALLY PROPELLED ROAD VEHICLES - CONNECTION TO AN EXTERNAL ELECTRIC POWER SUPPLY - SAFETY REQUIREMENTS
    CAN/CSA-C22.2 NO. 60950-22:17 Information technology equipment - Safety - Part 22: Equipment to be installed outdoors (Binational standard with UL 60950-22)
    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
    BS EN 60519-7:2009 Safety in electroheat installations Particular requirements for installations with electron guns
    I.S. HD 50573-5-57:2014 CO-ORDINATION OF ELECTRICAL EQUIPMENT FOR PROTECTION, ISOLATION, SWITCHING AND CONTROL
    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))
    IEC 60950-22 REDLINE : 2ED 2016 INFORMATION TECHNOLOGY EQUIPMENT - SAFETY - PART 22: EQUIPMENT TO BE INSTALLED OUTDOORS
    IEC 61851-22:2001 Electric vehicle conductive charging system - Part 22: AC electric vehicle charging station
    03/103069 DC : DRAFT JAN 2003
    05/30134690 DC : DRAFT JUNE 2005 IEC 60364-7-709 - LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 7-709: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - MARINAS AND SIMILAR LOCATIONS
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    17/30354248 DC : 0 BS EN 1648-2 - LEISURE ACCOMMODATION VEHICLES - 12 V DIRECT CURRENT EXTRA LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 2: MOTOR CARAVANS
    04/30115650 DC : DRAFT JUNE 2004 IEC 60364-7-720 ED 1 - ELECTRICAL INSTALLATIONS OF BUILDINGS - PART 7-720: REQUIREMENTS FOR SPECIAL INSTALLATIONS OR LOCATIONS - CARAVAN PARKS, CAMPING PARKS, MARINAS AND SIMILAR LOCATIONS
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    CEI EN 61851-22 : 2003 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - PART 22: AC ELECTRIC VEHICLE CHARGING STATION
    06/30145325 DC : DRAFT JUN 2006 IEC 60519-7 - SAFETY IN ELECTROHEAT INSTALLATIONS - PART 7: PARTICULAR REQUIREMENTS FOR INSTALLATIONS WITH ELECTRON GUNS
    HD 60364-5-56:2010/A12:2017 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-56: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SAFETY SERVICES
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    I.S. EN ISO 16230-1:2015 AGRICULTURAL MACHINERY AND TRACTORS - SAFETY OF HIGHER VOLTAGE ELECTRICAL AND ELECTRONIC COMPONENTS AND SYSTEMS - PART 1: GENERAL REQUIREMENTS (ISO 16230-1:2015)
    BS EN 60947-7-3 : 2009 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 7-3: ANCILLARY EQUIPMENT - SAFETY REQUIREMENTS FOR FUSE TERMINAL BLOCKS
    BS EN 60950-22:2017 (published 2017-08) Information technology equipment. Safety Equipment to be installed outdoors
    NBR IEC 61851-22 : 2013 ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM - PART 22: A.C ELECTRIC VEHICLE CHARGING STATION
    S.R. HD 60364-5-557:2013 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-557: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - AUXILIARY CIRCUITS
    IEC 61851-21:2001 Electric vehicle conductive charging system - Part 21: Electric vehicle requirements for conductive connection to an a.c./d.c. supply
    IEC 60364-6:2016 Low voltage electrical installations - Part 6: Verification
    I.S. EN 15869-2:2010 INLAND NAVIGATION VESSELS - ELECTRICAL SHORE CONNECTION, THREE PHASE CURRENT 400 V, UP TO 63 A, 50 HZ - PART 2: ONSHORE UNIT, SAFETY REQUIREMENTS
    15/30321124 DC : 0 BS EN 60364-4-41 ED 5.0 /A1 - LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-41: PROTECTION FOR SAFETY - PROTECTION AGAINST ELECTRIC SHOCK
    IEC TR 60269-5:2014 Low-voltage fuses - Part 5: Guidance for the application of low-voltage fuses
    IEC 60364-7-709:2007+AMD1:2012 CSV Low-voltage electrical installations - Part 7-709: Requirements for special installations or locations - Marinas and similar locations
    S.R. HD 60364-6:2016 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 6: VERIFICATION
    IEC TR 61200-52:2013 Electrical installation guide - Part 52: Selection and erection of electrical equipment - Wiring systems
    IEC 60364-5-53:2001+AMD1:2002+AMD2:2015 CSV Electrical installations of buildings - Part 5-53: Selection and erection of electrical equipment - Isolation, switching and control
    EN IEC 62933-2-1 : 2018 ELECTRICAL ENERGY STORAGE (EES) SYSTEMS - PART 2-1: UNIT PARAMETERS AND TESTING METHODS - GENERAL SPECIFICATION (IEC 62933-2-1:2017)
    IEC TR 61200-704:1996 Electrical installation guide - Part 704: Construction and demolition site installations
    UL 60950-22 : 2 INFORMATION TECHNOLOGY EQUIPMENT - SAFETY - PART 22: EQUIPMENT TO BE INSTALLED OUTDOORS
    I.S. EN ISO 17409:2017 ELECTRICALLY PROPELLED ROAD VEHICLES - CONNECTION TO AN EXTERNAL ELECTRIC POWER SUPPLY - SAFETY REQUIREMENTS (ISO 17409:2015, CORRECTED VERSION 2015-12-15)
    BIS IS 13252-22 : 2014 INFORMATION TECHNOLOGY EQUIPMENT - SAFETY - PART 22: EQUIPMENT TO BE INSTALLED OUTDOORS
    S.R. HD 60364-4-42:2011 LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 4-42: PROTECTION FOR SAFETY - PROTECTION AGAINST THERMAL EFFECTS
    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))
    CAN/CSA-C22.2 NO. 60947-7-3:17 Low-voltage switchgear and controlgear ? Part 7-3: Ancillary equipment ? Safety requirements for fuse terminal blocks (Trinational standard NMX-J-538/7-3-ANCE with UL 60947-7-3)
    I.S. EN 60519-7:2008 SAFETY IN ELECTROHEAT INSTALLATIONS - PART 7: PARTICULAR REQUIREMENTS FOR INSTALLATIONS WITH ELECTRON GUNS
    S.R. HD 60364-5-53:2015 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-53: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    I.S. HD 60364-5-54:2011 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
    ISO 14990-1:2016 Earth-moving machinery Electrical safety of machines utilizing electric drives and related components and systems Part 1: General requirements
    I.S. EN 60950-22:2017 INFORMATION TECHNOLOGY EQUIPMENT - SAFETY - PART 22: EQUIPMENT TO BE INSTALLED OUTDOORS
    CEI 103-1/12 : 2001 PRIVATE TELEPHONE EXCHANGES - PART 12: PROTECTION OF THE PRIVATE TELEPHONE EXCHANGES
    I.S. HD 60364-5-52:2011 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-52: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - WIRING SYSTEMS
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    I.S. HD 384.5.523:2002 ELECTRICAL INSTALLATIONS OF BUILDINGS - PART 5: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - SECTION 523: CURRENT-CARRYING CAPACITIES IN WIRING SYSTEMS
    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))
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    EN 60204-1 : 2006 COR 2010 SAFETY OF MACHINERY - ELECTRICAL EQUIPMENT OF MACHINES - PART 1: GENERAL REQUIREMENTS
    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))
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    I.S. EN 60947-7-3:2009 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 7-3: ANCILLARY EQUIPMENT - SAFETY REQUIREMENTS FOR FUSE TERMINAL BLOCKS
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    Standards Referencing This Book - (Show below) - (Hide below)

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    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
    IEC 60269-1:2006+AMD1:2009+AMD2:2014 CSV Low-voltage fuses - Part 1: General requirements
    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
    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
    IEC 60364-5-52:2009 Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems
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