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Measuring relays and protection equipment - Functional requirements for frequency protection. Original standard BS EN IEC 60255-181-2019 in PDF full version. Additional info + preview on request

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Measuring relays and protection equipment - Functional requirements for differential protection. Restrained and unrestrained differential protection of motors, generators and transformers. Original standard BS EN IEC 60255-187-1-2021 (2023) in PDF full version. Additional info + preview on request

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Measuring relays and protection equipment - Electromagnetic compatibility requirements. Original standard BS EN IEC 60255-26-2025 in PDF full version. Additional info + preview on request

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Measuring relays and protection equipment - Product safety requirements. Original standard BS EN IEC 60255-27-2025 in PDF full version. Additional info + preview on request

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Scales and sizes for plotting frequency characteristics and polar diagrams. Original standard BS EN IEC 60263-2020 in PDF full version. Additional info + preview on request

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Sound system equipment - Objective rating of speech intelligibility by speech transmission index. Original standard BS EN IEC 60268-16-2020 in PDF full version. Additional info + preview on request

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