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Railway applications Fixed installations Electrical safety, earthing and the return circuit Part 1: Protective provisions against electric shock. Original standard UNE-EN 50122-1-2023 in PDF full version. Additional info + preview on request

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Railway applications Fixed installations Electrical safety, earthing and the return circuit Part 2: Provisions against the effects of stray currents caused by DC traction systems. Original standard UNE-EN 50122-2-2023 in PDF full version. Additional info + preview on request

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Railway applications - Fixed installations - Electrical safety, earthing and the return circuit Part 3: Mutual Interaction of AC and DC traction systems. Original standard UNE-EN 50122-3-2023 in PDF full version. Additional info + preview on request

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Alarm systems Intrusion and hold-up systems Part 2-2: Requirements for passive infrared detectors. Original standard UNE-EN 50131-2-2-2023 in PDF full version. Additional info + preview on request

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Alarm systems - Intrusion and hold-up systems Part 2-3: Requirements for microwave detectors. Original standard UNE-EN 50131-2-3-2023 in PDF full version. Additional info + preview on request

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Corrigendum - Central safety power supply systems. Original standard UNE-EN 50171-2022 AC-2024 in PDF full version. Additional info + preview on request

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