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Low-voltage surge protective devices - Part 31- Requirements and test methods for SPDs for photovoltaic installations. Original standard UNE-EN 61643-31-2021 in PDF full version. Additional info + preview on request

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Mathematical expressions for reliability, availability, maintainability and maintenance support terms. Original standard UNE-EN 61703-2021 in PDF full version. Additional info + preview on request

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Corrigendum - Amendment 1 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications - Part 2- Lithium systems. Original standard UNE-EN 62133-2-2017 A1-2021 AC-2022 in PDF full version. Additional info + preview on request

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Amendment 1 - Secondary cells and batteries containing alkaline or other non-acid electrolytes. Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications - Lithium systems. Original standard UNE-EN 62133-2-2017 A1-2021 in PDF full version. Additional info + preview on request

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Amendment 11 - Household refrigerating appliances. Characteristics and test methods. Original standard UNE-EN 62552-3-2021 A11-2025 in PDF full version. Additional info + preview on request

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Amendment 1 - Power quality measurement in power supply systems - Functional tests and uncertainty requirements. Original standard UNE-EN 62586-2-2017 A1-2021 in PDF full version. Additional info + preview on request

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