HD 60364-4-43:2023/prAA:2025
(Amendment)Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent
Low-voltage electrical installations - Part 4-43: Protection for safety - Protection against overcurrent
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).
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
Nizkonapetostne električne inštalacije - 4-43. del: Zaščitni ukrepi – Nadtokovna zaščita - Dopolnilo AA.
General Information
- Status
- Not Published
- Publication Date
- 08-Sep-2026
- Technical Committee
- CLC/TC 64 - Electrical installations and protection against electric shock
- Current Stage
- 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
- Start Date
- 29-Aug-2025
- Due Date
- 16-Jul-2025
- Completion Date
- 29-Aug-2025
Relations
- Effective Date
- 09-Apr-2024
Overview
HD 60364-4-43:2023/prAA:2025 is a draft amendment under the European Committee for Electrotechnical Standardization (CLC) addressing the safety and reliability of low-voltage electrical installations. Specifically, this standard focuses on protection against overcurrent by providing updated requirements for the placement and coordination of overcurrent protection devices within installations. This amendment aligns closely with IEC 60364-4-43:2023, introducing technical revisions and clarifications, while also defining the scope of national conditions and deviations to support harmonized practices across member states.
By adopting this standard, electrical engineers, designers, and regulatory bodies can ensure enhanced safety for persons and properties, prevent electrical fires, and maintain effective operation of household, commercial, and industrial power systems.
Key Topics
- Protection of Conductors: Outlines how live, PEN, PEM, and PEL conductors must be shielded from harmful overcurrent effects to minimize safety hazards.
- Device Positioning: Annex G provides detailed requirements for placing protective devices. Devices must typically be installed at the origin of each circuit unless exceptions apply.
- Overload and Short-Circuit Protection: Updated criteria for positioning devices to guard against overloads and short-circuits, considering different installation scenarios and the reduction of conductors' capacity.
- Special National Conditions and Deviations: Annex ZB and ZC note specific national requirements and regulatory deviations, ensuring national legislation is respected while supporting harmonization.
- Technical Updates and Restructuring:
- Preferred use of “automatic disconnection of supply” for overcurrent protection.
- Other methods confined to specific annexes for restricted use.
- Addition of new terms and definitions.
- Enhanced focus on the neutral or mid-point conductor, especially for installations with or without triplen harmonics.
Applications
The standard is critical for professionals involved in the design, installation, inspection, and maintenance of low-voltage electrical systems. Common areas of application include:
- Residential Buildings: Ensuring household wiring is safeguarded against potential overload or short-circuit incidents.
- Commercial and Industrial Facilities: Providing requirements for complex installations with multiple circuits and varied conductor types.
- Electricity Supply Systems: Guidance for network operators on the correct installation and coordination of overcurrent protection devices at various distribution points.
- Product Compliance: Manufacturers of fuses, circuit breakers, and overcurrent protection devices can align product design with regional expectations and technical requirements.
The practical guidelines and technical clarifications in this standard help reduce risks such as electrical fires, equipment damage, and minimize service interruptions, supporting both safety and continuity.
Related Standards
Professionals referencing HD 60364-4-43:2023/prAA:2025 should also consider related standards for comprehensive compliance:
- IEC 60364-4-43:2023: The international base document for overcurrent protection in low-voltage systems.
- HD 60364-5-53: Protection, isolation, switching, control, and monitoring in electrical installations.
- National standards: Country-specific standards such as CEI 0-21 (Italy) for supply grid provisions, or additional annexes covering national requirements in Germany and the UK.
- SIST HD 60364 series: Other parts of the Slovenian adaptation of the IEC 60364 series for low-voltage installations.
- Product standards: For fuses and overcurrent protection devices (ICS 29.120.50).
Consulting these references together supports robust, compliant, and safe electrical system design and operation across Europe.
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Frequently Asked Questions
HD 60364-4-43:2023/prAA:2025 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/prAA:2025 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/prAA:2025 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/prAA:2025 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
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
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)
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 “
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
...
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