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Materials for printed boards and other interconnecting structures - Part 2-52- Reinforced base materials clad and unclad - Thermosetting hydrocarbon resin system, woven E-glass reinforced laminate sheets of defined flammability (vertical. Original standard UNE-EN IEC 61249-2-52-2025 in PDF full version. Additional info + preview on request

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Corrigendum - Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-46- Tests Damp heat, cyclic. Original standard UNE-EN IEC 61300-2-46-2020 AC-2022 in PDF full version. Additional info + preview on request

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Controlgear for electric light sources - Safety - Part 2-8- Particular requirements - Ballasts for fluorescent lamps (IEC 61347-2-8-2024) Appareillages de commande pour les sources de lumière électriques. Original standard UNE-EN IEC 61347-2-8-2025 in PDF full version. Additional info + preview on request

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Wind energy generation systems Part 12-2- Power performance of electricity producing wind turbines based on nacelle anemometry. Original standard UNE-EN IEC 61400-12-2-2024 in PDF full version. Additional info + preview on request

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Wind energy generation systems Part 12-3- Power performance Measurement based site calibration. Original standard UNE-EN IEC 61400-12-3-2024 in PDF full version. Additional info + preview on request

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Corrigendum - Low-voltage switchgear and controlgear assemblies Part 5- Assemblies for power distribution in public networks. Original standard UNE-EN IEC 61439-5-2024 AC-2025 in PDF full version. Additional info + preview on request

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