bs英国标准bsen50288-7-20xx模拟和数字通信及控制中使用的多元件金属电缆仪器和控制电缆的分规范

bs英国标准bsen50288-7-20xx模拟和数字通信及控制中使用的多元件金属电缆仪器和控制电缆的分规范内容摘要：

ed. This sectional specification is to be read in conjunction with EN 502881, which contains the essential provisions for its application. Cables covered by this specification have maximum rated voltages of 90 V, 300 V and 500 V . These cables shall not be connected directly to mains electricity supply or other low impedance sources. Multielement cables for use in analogue, digital and control circuits are not designed to be used for power supply. These cables should be installed in accordance with the applicable local and national regulations. Cables intended to have limited circuit integrity in a fire are not covered by this specification, but they are however under consideration for future editions. There may be occasions when cables are required to have higher operating temperature ratings than those provided by using materials specified by the EN 50290 series. Suitable alternative materials are under consideration. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Publication Year Title EN 102181 EN 102442 Steel wire and wire products ﾖ General ﾖ Part 1: Test methods Steel wire and wire products ﾖ Nonferrous metallic coatings on steel wire ﾖ Part 2: Zinc or zinc alloy coatings EN 102571 Zinc or zinc alloy coated nonalloy steel wire for armouring either power cables or telemunications cables ﾖ Part 1: Land cables EN 50289 Series Communication cables Specifications for test methods EN 50290 Series Communication cables EN 50307 Lead and lead alloy sheath and sleeves of electric cables EN 5028 8 7 :2 0 0 5 6 EN 60708 Lowfrequency cables with polyolefin insulation and moisture barrier EN 6081111 polyolefin sheath (IEC 60708) Insulating and sheathing materials of electric and optical cables ﾖ Common test methods ﾖ Part 11: General application ﾖ Measurement of thickness and overall dimensions ﾖ Tests for determining the mechanical properties (IEC 6081111) HD 383 S2 Conductors of insulated cables First supplement: Guide to the dimensional limits of circular conductors (IEC 60228 + IEC 60228A, mod.) HD S1 Thermocouples Part 3: Extension and pensating cables ﾖ tolerances and identification system (IEC 605843, mod.) 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, symbols and abbreviations For the purposes of this European Standard the definitions of EN 502881 apply in addition to the following: foil a metal tape laminated to a plastic tape 4 Cable construction Conductor Except for thermocouple extension and pensating cables, with conductors as described in Annex D, conductors shall be solid, stranded or flexible plain or metal coated copper in accordance with Class 1, 2 or 5 of HD 383 in the range of 0,5 mmﾲ to 2,5 mmﾲ . For multicore cables the maximum conductor resistance shall be as HD 383, and for finished multipair, multi triple and multiquad cables the maximum resistance of HD 383 shall be increased by 2 %. Conductor joints shall be as EN 502881. Stranded and flexible conductors shall consist of wires circular in cross section assembled, without insulation between them, by concentric stranding or by bunching. When the installed length of cable results in a high conductor resistance, larger conductor sizes can be used. 7 EN 5028 8 7 :2 0 0 5 Insulation The insulating material shall be selected from those listed below. It shall be applied to ply with the requirements of EN 502881. a) PVC EN 50290221 b) Polyethylene EN 50290223 c) Polypropylene EN 50290225 d) Halogen free flame retardant pound EN 50290226 e) Crosslinked polyethylen EN 50290229 The minimum thickness at any point of the insulation shall not be less than the value given in Table 1, for the specified voltage rating, and the concentricity shall not fall below 75 % when measured using the procedure in Annex A. There may be occasions when cables are required to have higher operating temperature ratings than those provided by using materials specified by the EN 50290 series. Suitable alternative materials are under consideration. Table 1 ﾖ Minimum insulation thickness Conductor size mm2 Minimum thickn ess mm Voltage rating 90 V 300 V 500 V 0,5 0,20 0,26 0,44 0,75 0,20 0,26 0,44 1,0 0,26 0,26 0,44 1,5 0,30 0,35 0,44 2,5 0,53 Cable elements Cable elements shall be in accordance with of EN 502881. The lay length of a pair, triple or quad shall not exceed 100 mm for cables with conductor cross section ≤ 1,5 mmﾲ , nor 150 mm for cables with conductor crosssection 2,5 mmﾲ . EN 5028 8 7 :2 0 0 5 8 Identification of cabling elements Unless otherwise specified . by means of numbered cores or tapes, the coding for identification shall be as given in IEC 601892 or EN 60708, as appropriate. The colours shall meet the requirements of of EN 502881. Coloured or numbered nonhygroscopic binder tapes may be applied over screened cabling e。