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Multi-element metallic cables used in analogue and digital communication and control - Sectional specification for screened cables characterised up to 100 MHz. Horizontal and building backbone cables Ingestion-build-44680 The methods and test procedures1 Scope EN 5028821 is a sectional specification for screened cables, characterised from 1 MHz up to 100 MHz, to be used in horizontal and building backbone wiring as defined in EN 50173. This sectional specification contains the electrical, mechanical, transmission and environmental performance characteristics of the cables, when tested in accordance with the referenced test methods. This sectional specification is to be read in conjunction with EN