HD 60364-4-43:2023/FprAA:2026
(Amendment)Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent
General Information
- Abstract
IEC 60364-4-43:2023 provides requirements for: - protection of live conductors, PEN conductors, PEM conductors, and PEL conductors against the harmful effects caused by overcurrent; - coordination of measures for protection against overcurrent. This fourth edition cancels and replaces the third edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the standard has been restructured, see Table 1 (Correspondence between IEC 60364‑4‑43:2008 and this document) below; b) the measure "automatic disconnection of supply" has been designated as the preferred measure for protection against overcurrent; c) all measures except the measure "automatic disconnection of supply" have been transferred into new normative annexes to indicate that these measures are usable in certain applications and under certain restricted conditions only (see Annex A, Annex B and Annex E); d) a new clause "Terms and definitions" has been added; e) new requirements have been added for the protection of the neutral or mid-point conductor (with and without triplen harmonics).
- Status
- Not Published
- Publication Date
- 03-Jan-2027
- Technical Committee
- CLC/TC 64 - Electrical installations and protection against electric shock
- Current Stage
- 4599 - Dispatch of FV draft to CMC - Finalization for Vote
- Start Date
- 10-Jul-2026
- Due Date
- 11-Mar-2026
- Completion Date
- 10-Jul-2026
Overview
HD 60364-4-43:2023/FprAA:2026 is a critical standard issued by the European Committee for Electrotechnical Standardization (CLC). This document specifies requirements for the protection of live, PEN, PEM, and PEL conductors against the harmful effects of overcurrent in low-voltage electrical installations. It further outlines the coordination between protective measures designed to mitigate the risks of overcurrents, whether due to overload or short-circuit conditions.
The current edition represents a technical revision, with significant updates, including the restructuring of requirements and a greater focus on the automatic disconnection of supply as a primary protective measure. This standard is an essential reference for industry professionals seeking to ensure safety, reliability, and conformity in electrical installation design and operation throughout Europe.
Key Topics
- Protection of Conductors: Specifies rigorous measures for safeguarding various conductor types (including neutral, PEN, PEM, PEL) against overcurrent events.
- Automatic Disconnection of Supply: Prioritizes automatic disconnection as the preferred method for overcurrent protection, while alternative measures are detailed in normative annexes for restricted applications.
- Positioning of Overcurrent Protection Devices: Requires installation of protective devices at the origin of each circuit, with exceptions and specific cases outlined for flexibility and safety.
- Special National Conditions: Incorporates unique national practices and regulations under certain annexes, ensuring harmonization across European member states while allowing for lawful local deviations.
- Short-Circuit and Overload Protection: Provides specific requirements for the placement and coordination of devices that protect against short-circuit currents and overloads, adapting to changes in conductor capacity or installation characteristics.
Applications
Implementing the requirements of HD 60364-4-43:2023/FprAA:2026 ensures that low-voltage electrical systems are protected from the damaging effects of excessive current. Key practical applications include:
- Building Electrical Installations: Ensures residential, commercial, and industrial buildings are equipped with compliant overcurrent protection, minimizing fire and electrical safety hazards.
- Electricity Supply Networks: Applies to primary and secondary distribution circuits, helping grid operators and network designers ensure safe and coordinated protection.
- Modernization Projects: Supports engineers and contractors in upgrading existing installations to current safety standards, particularly with respect to neutral conductor and special overcurrent provisions.
- System Integration: Essential for integrators specifying and coordinating fuses, circuit breakers, and related overcurrent devices, accommodating changes in wiring configuration, installation environment, or conductor materials.
By adhering to the standard, organizations can achieve legal compliance within the EU, reduce downtime from electrical faults, and enhance protection of property and personnel.
Related Standards
- IEC 60364-4-43:2023: The international equivalent detailing overall requirements for protection against overcurrent in low-voltage electrical installations.
- EN 60364 Series: The broader family of European standards for low-voltage electrical installations, covering everything from wiring rules to earthing and circuit design.
- IEC 60364-5-53: Addresses selection and erection of electrical equipment, with extensions impacting overcurrent protection measures discussed in national annexes.
- HD 60364-5-53:2015: Provides complementary guidelines for protective devices and their integration into electrical assemblies.
Conclusion
HD 60364-4-43:2023/FprAA:2026 is a cornerstone for ensuring electrical safety in low-voltage installations across Europe. By specifying robust requirements and harmonizing them with national practices, the standard enhances protection against overcurrent, helping professionals deliver safe, reliable, and standard-compliant electrical solutions. For engineers, designers, and inspectors, familiarity and implementation of this standard are fundamental for high-quality electrical infrastructure.
Relations
- Effective Date
- 09-Apr-2024
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Frequently Asked Questions
HD 60364-4-43:2023/FprAA:2026 is a draft published by CLC. Its full title is "Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent". This standard covers: IEC 60364-4-43:2023 provides requirements for: - protection of live conductors, PEN conductors, PEM conductors, and PEL conductors against the harmful effects caused by overcurrent; - coordination of measures for protection against overcurrent. This fourth edition cancels and replaces the third edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the standard has been restructured, see Table 1 (Correspondence between IEC 60364‑4‑43:2008 and this document) below; b) the measure "automatic disconnection of supply" has been designated as the preferred measure for protection against overcurrent; c) all measures except the measure "automatic disconnection of supply" have been transferred into new normative annexes to indicate that these measures are usable in certain applications and under certain restricted conditions only (see Annex A, Annex B and Annex E); d) a new clause "Terms and definitions" has been added; e) new requirements have been added for the protection of the neutral or mid-point conductor (with and without triplen harmonics).
IEC 60364-4-43:2023 provides requirements for: - protection of live conductors, PEN conductors, PEM conductors, and PEL conductors against the harmful effects caused by overcurrent; - coordination of measures for protection against overcurrent. This fourth edition cancels and replaces the third edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the standard has been restructured, see Table 1 (Correspondence between IEC 60364‑4‑43:2008 and this document) below; b) the measure "automatic disconnection of supply" has been designated as the preferred measure for protection against overcurrent; c) all measures except the measure "automatic disconnection of supply" have been transferred into new normative annexes to indicate that these measures are usable in certain applications and under certain restricted conditions only (see Annex A, Annex B and Annex E); d) a new clause "Terms and definitions" has been added; e) new requirements have been added for the protection of the neutral or mid-point conductor (with and without triplen harmonics).
HD 60364-4-43:2023/FprAA:2026 is classified under the following ICS (International Classification for Standards) categories: 29.120.50 - Fuses and other overcurrent protection devices; 91.140.50 - Electricity supply systems. The ICS classification helps identify the subject area and facilitates finding related standards.
HD 60364-4-43:2023/FprAA:2026 has the following relationships with other standards: It is inter standard links to HD 60364-4-43:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
HD 60364-4-43:2023/FprAA:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Nizkonapetostne električne inštalacije - 4-43. del: Zaščitni ukrepi - Zaščita pred
nadtoki - Dopolnilo AA
Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against
overcurrent
Errichten von Niederspannungsanlagen - Teil 4-43: Schutzmaßnahmen - Schutz bei
Überstrom
Installations électriques à basse tension - Partie 4-43: Protection pour assurer la sécurité
- Protection contre les surintensités
Ta slovenski standard je istoveten z: HD 60364-4-43:2023/prAA:2025
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
HARMONIZATION DOCUMENT DRAFT
HD 60364-4-43:2023
DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT
prAA
June 2025
ICS 91.140.50; 29.120.50 -
English Version
Low-voltage electrical installations - Part 4-43: Protection for
safety - Protection against overcurrent
Installations électriques à basse tension - Partie 4-43: Errichten von Niederspannungsanlagen - Teil 4-43:
Protection pour assurer la sécurité - Protection contre les Schutzmaßnahmen - Schutz bei Überstrom
surintensités
This draft amendment prAA, if approved, will modify the Harmonization Document HD 60364-4-43:2023; it is submitted to CENELEC
members for enquiry.
Deadline for CENELEC: 2025-08-29.
It has been drawn up by CLC/TC 64.
If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for implementation of this amendment on a national level.
This draft amendment, was established by CENELEC in three official versions (English, French, German).
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a Harmonization Document. It is distributed for review and comments. It is subject to change without notice
and shall not be referred to as a Harmonization Document.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 79835 Ref. No. HD 60364-4-43:2023/prAA:2025 E
HD 60364-4-43:2023/prAA:2025 (E)
Contents Page
1 European foreword . 3
2 1 Modification to Subclause 431.4, “Protection against overload current” . 4
3 2 Modification to Subclause 431.5, “Protection against short-circuit currents” . 4
4 3 Addition of Annex G, “Position of overcurrent protection devices” . 4
5 Annex G (normative) Position of overcurrent protection devices. 5
6 G.1 General . 5
7 G.2 Positioning of devices for overload protection . 5
8 G.3 Positioning of devices for short-circuit protection . 6
9 4 Addition of Annex ZB, “Special national conditions” and Annex ZC, “A-deviations” . 6
10 Annex ZA (normative) Special national conditions. 7
11 Annex ZB (informative) A-deviations . 8
HD 60364-4-43:2023/prAA:2025 (E)
12 European foreword
13 This document (HD 60364-4-43:2023/prAA:2025) has been prepared by CLC/TC 64 “Electrical installations
14 and protection against electric shock”.
15 This document is currently submitted to the Enquiry.
16 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
HD 60364-4-43:2023/prAA:2025 (E)
17 1 Modification to Subclause 431.4, “Protection against overload current”
18 In 431.4.1, add the following paragraph:
19 “The positioning of overcurrent protective devices for protection against overload currents shall meet the
20 requirements provided in Annex G.”
21 2 Modification to Subclause 431.5, “Protection against short-circuit currents”
22 In 431.5.1, replace Note 1 with the following paragraph:
23 “The positioning of overcurrent protective devices for protection against short-circuit currents shall meet the
24 requirements provided in Annex G.”
25 3 Addition of Annex G, “Position of overcurrent protection devices”
26 Add the following new normative Annex G:
27 “
HD 60364-4-43:2023/prAA:2025 (E)
28 Annex G
29 (normative)
31 Position of overcurrent protection devices
32 G.1 General
33 Devices for overload and/or short-circuit protection shall be installed at the origin of each circuit unless the
34 exceptions of G.2 and/or G.3 are applied.
35 G.2 Positioning of devices for overload protection
36 G.2.1 A device for protection against overload shall be placed at each point where there is a reduction in the
37 value of current-carrying capacity of the conductors except where A.2, G.2.2, G.2.3, or G.2.4 apply. The
38 requirements in G.2.2 to G.2.4 shall not be applied to installations situated in locations presenting a fire risk or
39 risk of explosion.
40 NOTE A reduc
...