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Radio-frequency connectors - Electrical test methods - Voltage standing wave ratio for a single connector by double connector method. Original standard PD IEC TR 61169-1-8-2025 in PDF full version. Additional info + preview on request

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High-voltage switchgear and controlgear - Guidance for the extension of validity of type tests of AC metal and solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV. Original standard PD IEC TR 62271-307-2024 in PDF full version. Additional info + preview on request

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Effective area measurements of single-mode optical fibres - Guidance. Original standard PD IEC TR 62284-2025 in PDF full version. Additional info + preview on request

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LVDC systems - Low-voltage DC electric island power supply systems. Original standard PD IEC TR 63282-102-2025 in PDF full version. Additional info + preview on request

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Nuclear facilities - Instrumentation, control and electrical power systems important to safety - Structure of the IEC SC 45A standards series. Original standard PD IEC TR 63400-2025 in PDF full version. Additional info + preview on request

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Design and application of retrofit LED lamps. Original standard PD IEC TR 63633-2025 in PDF full version. Additional info + preview on request

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