【導(dǎo)讀】EPL/46,Cables,wires,waveguides,.connectors,.andmicrowave. StandardsOnline.Câblesmétalliquesàélémentsmultiples

　　

【正文】 Characteristic impedance EN 502891 11 Return loss EN 502891 11 Coupling attenuation EN 502891 6 Transfer impedance EN 502891 6 Screening attenuation EN 502891 6 1) Although values given in the s ectional s pecification m ust be met to ply with the cable s tandard, the s ys tem requirements always take precedence. For exam ple, EN 5028821 gives an attenuation equation of 1,9108?f + 0,0222f + 0,2/?f, but when it is known that the maximum length of the horizontal cable is less than 87 m or when the flexible cables used in conjunction with the horizontal cable have an additional attenuation factor not greater than 1,20, it is permissible to us e cable cons tructions corresponding to the equation 1,967?f + 0,0222f + 0,2/?f to m eet the cabling s ystem requirement. EN 502881:2020 – 12 – Mechanical test methods Subclause no. Parameter Test method Standard Part no. Conductor elongation at break EN 100021 Shrinkage of insulation EN 502893 4 Crush resistance of the cable EN 502893 5 Impact resistance of the cable EN 502893 6 Abrasion resistance of the sheath marking EN 502893 8 Simulated installation testing of the cable EN 502893 9 Tensile performance of the cable EN 502893 16 Flexing performance of the cable EN 502893 10 Environmental test methods Subclause no. Parameter Test method Standard Part no. Cold bend performance of the cable EN 608111 4, subclause W ater peration test EN 502894 2 Moisture permeation test EN 502894 3 Resistance to solvents and contaminating fluids EN 502894 4 Temperature cycling EN 502894 6 Fire performance test methods The choice of the tests to be performed shall be made according to EN 5029041 and any regulatory requirements, such as the construction products directive. – 13 – EN 502881:2020 Bibliography The following standards are referenced but do not constitute a normative part of the standard: EN 5009021 Home and Building Electronic Systems (HBES) Part 21: System overview Architecture EN 5009031 Home and Building Electronic Systems (HBES) Part 31: Aspects of application Introduction to the application structure EN 500981 Customer premises cabling for Information Technology Part 1: ISDN basic access EN 500982 Customer premises cabling for Information Technology Part 2: 2 048 kbit/s ISDN primary access and leased line work interface BS EN 502881:2020 BSI 389 Chiswick High Road London W4 4AL BSI — British Standards Institution BSI is the indep e n d e nt national body responsible for preparin g British Standard s. 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