Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, and definitions
IEC · IEC TC 64
The top-level part of the IEC 60364 low-voltage installation series, defining its scope and fundamental safety requirements; sixth edition published in 2025.
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Overview
IEC 60364-1 is the top-level part of the IEC 60364 series on low-voltage electrical installations. It defines the scope and objective of the series and the fundamental safety requirements an electrical installation must meet, which makes it the framework document on which the other parts rest. The sixth edition, published on 5 September 2025, runs to 99 pages and was prepared by IEC TC 64.
The new edition cancels and replaces the 2005 fifth edition, and the entire document has been restructured and renumbered. New topics include safety services and standby electric supply systems (1.5.2.2.2), energy efficiency (1.5.2.14) and prosumer electrical installations (1.5.2.15). In addition, clause 1.5.4.3 recommends periodic verification of protective measures over the lifetime of the installation.
Related documents include IEC 60364-4-41, IEC 60364-5-56, HD 60364-1 and the Turkish Elektrik İç Tesisleri Yönetmeliği. Its limit is that it does not give detailed design rules; those sit in the later parts of the series, which this page does not replace.
Key points
- Defines the scope and objective of the IEC 60364 series and fundamental safety requirements.
- Sixth edition cancels and replaces the 2005 fifth edition; restructured and renumbered.
- 1.5.2.2.2 adds safety services and standby electric supply systems.
- 1.5.2.14 adds energy efficiency.
- 1.5.2.15 adds prosumer electrical installations.
- 1.5.4.3 recommends periodic verification of protective measures over the installation lifetime.
- Published 5 September 2025; 99 pages, IEC TC 64.
Using it in design
- In the electrical rules engine, use IEC 60364-1 as the root of the low-voltage rule set.
- Capture the earthing system (TN/TT/IT) and supply characteristics at project start.
- Record standby and safety-service supplies as distinct source types, because the series treats them differently.
- Reflect the periodic verification recommendation in the operations maintenance plan.
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Who should read it
Electrical engineers designing low-voltage installations and standards compliance leads.
Related standards
- IEC 60364-4-41
- IEC 60364-5-56
- HD 60364-1
- Elektrik İç Tesisleri Yönetmeliği
Publication details
- Authors
- IEC TC 64
- Publisher
- IEC
- Year
- 2025
- Document number
- IEC 60364-1:2025
- Document language
- English
- Source type
- Standard
- Access
- Citation only
- Licence
- Copyright retained; citation only — the publisher’s terms apply to the original document
Original licence note
Paid standard. Record built only from the publisher's public catalogue abstract and product metadata; full text not redistributed.
Citation
IEC TC 64 (2025). Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, and definitions. IEC. IEC 60364-1:2025. https://webstore.iec.ch/en/publication/63699
Events on this subject
- Electricity Eurasia 2027
- The smarter E Europe (Intersolar Europe, ees Europe, Power2Drive, EM-Power)
- ELECO 2026 Elektrik-Elektronik ve Biyomedikal Mühendisliği Konferansı
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