State system for ensuring the uniformity of measurements. State verification chain for measuring instruments of length and signal propagation time in optical fiber, average power, attenuation and wavelength of optic radiation for fiber-optical communication and data transmission systems
Low-voltage switchgear and controlgear assemblies. Part 3. Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use. Distribution boards
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