bs英国标准bsen50288-6-2-20xx用于模拟和数字通信和控制的多元件金属电缆第6-2部分250mhz及以下的非屏蔽电缆的分规范工作区域和中继电缆

bs英国标准bsen50288-6-2-20xx用于模拟和数字通信和控制的多元件金属电缆第6-2部分250mhz及以下的非屏蔽电缆的分规范工作区域和中继电缆内容摘要：

t methods, are detailed. This sectional specification is to be read in conjunction with EN 502881, which contains the essential provisions for its application. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the cited publications are listed hereafter. For dated references, subsequent amendments to or revisions of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. EN 50173 Information technology Generic cabling systems EN 502881 Generic specification for multielement metallic cables used in analogue and digital munication and control EN 50289 Series Communication cables Specifications for test methods EN 50290 Series Communication cables IEC 601892 Lowfrequency cables and wires with PVC insulation and PVC sheath Part 2: Cables in pairs, triples, quads and quintuples for inside installations 3 Definitions For the purposes of this European Standard the definitions of EN 502881 apply. 4 Cable construction Conductor The conductor shall be solid or stranded copper and meet the requirements of of EN 502881. The stranded conductor shall consist of seven wires each with a nominal diameter of  0,12 mm to  0,21 mm. The solid conductor nominal diameter shall be  0,4 mm to  0,8 mm. The conductor shall be plain or metal coated. ﾖ 5 ﾖ EN 5028 8 6 2 :2 00 3 Insulation The insulation shall be of a suitable material according to the relevant part of EN 502902. Cabling elements The cable element shall be a pair or a quad. Identification of cabling elements Unless otherwise specified, the colour coding for identification is given in IEC 601892. The colours shall meet the requirements of of EN 502881. Screening of cabling elements Not applicable. Cable makeup The cable elements shall be laid up in concentric layer(s) or units to form the cable core. Filling pound Not applicable. Interstitial fillers Where fillers are used they shall meet the requirements of of EN 502881. Screening of the cable core Not applicable. Moisture barriers Not applicable. Wrapping layers Where wrapping layers are used they shall be in accordance with of EN 502881. Sheath The sheath shall be of a suitable material according to the relevant part of EN 502902. EN 5028 8 6 2 :2 00 3 ﾖ 6 ﾖ 1 4 10 16 20 31,25 62,5 100 155 200 250 MHz 66,0 65,3 59,3 56,2 54,8 51,9 47,4 44,3 41,4 39,8 38,3 dB 5 Tests and requirements for pleted cables The following tables give the tests to be applied, together with the respective limits, in order to demonstrate pliance with this specification. Electrical tests Lowfrequency and . electrical measurements EN 50288 1 Subclaus e no. Parameter Requirement Conduc tor loop resistanc e  29,0 /100 m Conduc tor resistanc e unbal anc e  2,0 % Dielectric strength conductor/c o nduc tor 1,0 kV . or 0,7 kV . for 1 min or 2,5 kV . or 1,7 kV . for 2 s Insulati on resistanc e  500 M km using 100 V 500 V test voltage Mutual capaci tanc e No require m ent specifi ed Capaci tanc e unbal a nc e to earth  1 600 pF/km Highfrequency electrical and transmission measurements EN 50288 1 Subclaus e no. Parameter Requirement Velocity of propagati on Phase delay  534+ 36/√f ns/100 m, 1 MHz  f  250 MHz Propa ga ti on del ay differ enc e (sk ew)  40 ns/100 m at 100 MHz Longi tudi nal attenu ati on 2) 3) 4) 1 4 10 16 20 31,25 62,5 100 155 200 250 MHz 3,1 5,7 9,0 11,4 12,8 16,1 23,2 29,9 37,9 43,7 49,5 dB/100 m  1,5(1,82 f+ 0,01 69f+ 0,25/f), 1 MHz  f  250 MHz Nearend crosstalk (NEXT) 1) 2)  74,3 1。