The standard includes informative annexes showing:

Selecting Insulators for Polluted Environments: Utility ... - INMR

Purchasing the official PDF ensures you have the complete, accurate, and up-to-date requirements needed for your project.

Feature deep under-ribs that increase the creepage distance and keep the inner sections dry during light rain or fog, disrupting the continuous conductive path. Why Engineers Need the IEC 60815-2 PDF

If you are drafting technical documentation, an article, or a summary regarding this standard, ensure you cover these primary pillars:

While you can find scanned versions floating around, the IEC Webstore is the only source for the official, un-watermarked, color PDF (the graphs are impossible to read in black & white scans). Many national bodies (like ANSI in the US or BSI in the UK) also sell the identical document.

In practice, the document addresses:

The baseline creepage distance determined directly from the Site Pollution Severity (SPS) class.

: Explain the transition from "creepage distance" to "USCD" based on the Emcap E sub m (mean surface electric field).

for insulator dimensions, diameter, mounting position, and altitude to determine the mandatory Unified Specific Creepage Distance (USCD).

To understand Part 2, it helps to see how the complete standard is organized:

Utilizing standardized calculations reduces the risk of over-engineering (which wastes money on oversized towers and insulators) or under-engineering (which leads to costly grid failures). How to Access the PDF Safely and Legally

It gives a range (e.g., 31–43 mm/kV). The final choice depends on local history, importance of the line, and economic trade-offs between outages and hardware cost.