Offer excellent mechanical rigidity and flexible shed manufacturing options, but sub-surface micro-cracks require specialized testing to detect.
To mitigate these risks, utility engineers and system designers rely on international standards to select the right insulator geometry and materials. The definitive standard for this process is , titled "Selection and dimensioning of high-voltage insulators intended for use in polluted conditions." iec 60815-2 pdf
The original IEC/TS 60815‑2 was issued in 2008, superseding the old technical report IEC/TR 60815 (1986). The 2025 second edition, published on 3 December 2025, constitutes a . The 2025 second edition, published on 3 December
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SPS is measured using Unified Specific Creepage Distance (USCD) targets or via physical measurements like Equivalent Salt Deposit Density (ESDD) and Non-Soluble Deposit Density (NSDD). 2. Determining USCD (Unified Specific Creepage Distance)
is the shortest distance along the insulator surface between the two metal fittings. Together with the system voltage it gives the specific creepage distance (usually expressed in mm/kV).