Iec 600995 Pdf May 2026

IEC 60099-5 is an international technical standard that provides comprehensive guidelines for the selection and application of surge arresters in high-voltage three-phase systems (above 1 kV). Overview of IEC 60099-5

This standard is part of the broader IEC 60099 series and focuses on ensuring that surge arresters are correctly matched to the power system they protect. It is essential for engineers involved in insulation coordination and substation design.

Current Edition: The most recent major update is the third edition, IEC 60099-5:2018. Scope: It covers several types of arresters, including: Gapless metal-oxide surge arresters (per IEC 60099-4).

Arresters with series and parallel gapped structures (rated 52 kV and less). Externally gapped line arresters (EGLA) for overhead lines. Key Recommendations: iec 600995 pdf

Voltage Selection: It defines how to choose the Maximum Continuous Operating Voltage ( Uccap U sub c or MCOV) and Rated Voltage ( Urcap U sub r ).

Insulation Coordination: Provides models and methods for calculating fast-front and slow-front overvoltages to protect equipment like transformers.

Maintenance: Includes guidance on diagnostic programs, such as measuring leakage current to monitor arrester degradation. IEC 60099-5:2018 - Afnor EDITIONS IEC 60099-5 is an international technical standard that

This is a comprehensive guide and analysis covering IEC 60099-5, the international standard governing the selection and application of surge arresters.

While many search for an "IEC 60099-5 PDF" to find the specific document, this guide provides a detailed summary of the standard's contents, its role in electrical engineering, and the critical technical concepts it defines.

B. GIS (Gas Insulated Switchgear)

Arresters for GIS are encapsulated in SF6 gas. The standard discusses the different dielectric environments and the absence of air clearances. they may be outdated

Step 4: Determine the Protective Level ($U_p$)

The user must calculate the Lightning Impulse Protective Level (LIPL) and Switching Impulse Protective Level (SIPL). These values represent the "clamping voltage"—the maximum voltage the arrester lets through during a surge.

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Typical structure of the document

Scope and normative references
Terms and definitions
Classification and characteristics of SPDs
Selection and application guidance
Installation, wiring and earthing recommendations
Testing, verification and maintenance
Annexes with examples and calculation guidance

How to obtain the IEC 60099-5 PDF legally

Purchase from the IEC Webstore (official, authoritative copy).
National standards bodies (e.g., ANSI, BSI, DIN, SABS) may sell an adopted national version; check their stores.
Many university or corporate libraries provide access to IEC standards via their subscriptions—use institutional credentials.
Some companies and manufacturers provide excerpts, application guides, or white papers summarizing the standard; these are useful but are not substitutes for the full standard.

Do not rely on unauthorized free copies; they may be outdated, incomplete, or infringe copyright.

6. What About a “Free” Version?

If you need the standard only for reference or academic research:

IEC “Preview” – Many standards have a preview (first ~15 pages) on the IEC Webstore.
Older withdrawn editions – Some libraries (e.g., Internet Archive, university repositories) may have scanned copies of the 1990s editions, but these are not valid for compliance certification.
ISO/IEC Publicly Available Specifications (PAS) – Rarely applicable to battery/earthing standards.

Trade associations sometimes publish summaries or application guides (e.g., Battery Council International for IEC 60095). These are free but non-normative.