By following the recommendations in this guide, engineers can ensure that the surge arresters they select will provide reliable protection against overvoltages, extending the lifespan of valuable grid assets.
The "995" part may come from a misreading of a document title, a barcode, or an internal company document number mistakenly associated with IEC.
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Obtaining official standards requires adherence to copyright laws. Here is how to legally access the document:
As of 2026, remains the current standard, offering guidelines for selecting and applying surge arresters in three-phase systems exceeding 1 kV. This 2018 version, which replaced the 2013 edition, is active and directly aligned with the revised classification system in IEC 60099-4:2014. Key technical updates include: iec 600995 pdf upd
): The maximum charge that can be passed through the arrester blocks repeatedly during sequential lightning or switching operations. Analytical Estimation Formulas IEC 60099-5:2018
The guidance in IEC 60099-5 applies universally across high-voltage transmission, distribution, and substation equipment. It details how to protect expensive power assets from transient overvoltages caused by both atmospheric phenomena (lightning strikes) and system maneuvers (switching surges).
Be highly cautious of third-party websites offering free "PDF updates" or direct downloads for this standard. They frequently distribute pirated documents, outdated revisions, or malicious files disguised as standard PDFs. To obtain a legitimate, fully updated copy: Purchase and download the official PDF directly from the IEC Webstore
The work on international standards is never truly finished. The is currently in development. According to the latest project information, the "Working Draft (WD)" was approved for registration as a "Committee Draft (CD)" as of August 2024 . By following the recommendations in this guide, engineers
within this standard (such as line switching energy or continuous operating voltage calculations) to help with a project?
To stay current with IEC 60099-5 PDF updates, manufacturers, engineers, and other stakeholders can:
This article is for informational purposes only. Standard numbers and edition statuses change. Always refer to the latest IEC catalog for definitive validation.
The 3.1 edition introduced clarifications for harmonic measurement under distorted waveforms and improved uncertainty specifications for Class A instruments. Without the update, your compliance certification may be invalid. Here is how to legally access the document:
IEC releases three types of updates:
Additionally, the historical context of older Silicon Carbide (SiC) gapped arresters is retained in the standard's informative annexes to assist utilities managing legacy grid infrastructure. 2. Key Technical Evolutions in the Latest PDF Update
Includes expanded discussions and formulas (Annexes H and I) for calculating or estimating the corresponding charge for different system stresses.
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