IEC 61156-3:2003 pdf – Multicore and symmetrical pair/quad cables for digital communications – Part 3: Work area wiring – Sectional specification.
1 General 1.1 Scope and object This sectional specification relates to IEC 61156-1. The cables are specifically intended for work area wiring as defined in ISO/IEC 11801. It covers individually unscreened pairs in cables for work area wiring. The cables may be provided with a common screen over the cable core. These cables are suitable for the various communication systems for which the reference is given in the appropriate detail specification. The cables covered by this sectional specification are intended to operate with voltages and currents normally adopted for communication systems. These cables should not be connected to low impedance sources, for example, the public mains electricity supply. The recommended temperature range during installation and operation may be indicated in the detail specification. NOTE 1 The nominal characteristics impedance of a cabling link, measured according to IEC 61156-1 should be 100 Ω, 120 Ω or 150 Ω at frequencies between 1 MHz and the highest specified frequency for the cabling category. NOTE 2 The attenuation should not be higher by more than 50 % for each respective category. NOTE 3 The resistance may be 20 % higher than the resistance of the corresponding category. 1.2 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. Reference documents given in IEC 61156-1 as well as the following apply: IEC 60096-0-1, Radio Frequency cables – Part 0-1: Guide to the design of detail specifications – Coaxial cables IEC 61156-1, Multicore and symmetrical pair/quad cables for digital communications – Part 1: Generic specification ISO/IEC 11801, Information technology – Generic cabling for customer premises 1.3 Installation considerations See IEC 61156-1. 2 Definitions, materials and cable construction 2.1 Definitions See 2.1 of IEC 61156-1.
2.2 Materials and cable construction 2.2.1 General remarks The choice of materials and cable construction shall be suitable for the intended application and installation of the cable. Particular care shall be taken to meet any special requirements for fire performance (such as burning properties, smoke generation, evolution of halogen gas, etc.). 2.2.2 Cable construction The cable construction shall be in accordance with the details and dimensions given in the appropriate detail cable specification. 2.2.3 Conductor The conductor shall consist of annealed copper. The conductor may be solid or stranded. The solid conductor nominal diameter shall be between 0,3 mm and 0,6 mm. Preferably, the stranded conductor should consist of seven strands. The conductor shall be plain or tinned. The conductor may consist of one or more elements of thin copper or copper alloy tape which shall be applied spirally over a fibrous thread. Joints in the complete element shall not be permitted. 2.2.4 Insulation The conductor shall be insulated with a suitable thermoplastic material. Examples of suitable materials are: – polyolefin; – PVC; – fluoropolymer; – low-smoke zero halogen thermoplastic material. The insulation may be solid or cellular with or without a solid dielectric skin. The insulation shall be continuous and shall have a thickness such that the completed cable meets the specified requirements. The nominal thickness of insulation shall be compatible with the method of conductor connection. 2.2.5 Colour code of insulation The colour code is not specified but shall be indicated in the appropriate detail specification. The colours shall be readily identifiable and shall correspond reasonably with the standard colours shown in IEC 60304. NOTE It is acceptable to mark or stripe the “a” wire with the colour of the “b” wire to facilitate pair identification. 2.2.6 Cable element The cable element shall be a pair adequately twisted to aid pair identification.
2.2.7 Screening of the cable element Subclause 2.2.7 of IEC 61156-1 is not applicable to cables covered by this specification. 2.2.8 Cable make-up The cable elements shall be assembled to form the cable core. The core of the cable may be wrapped with a protective layer of non-hygroscopic material. 2.2.9 Screening of the cable core When required by the appropriate detail specification, a screen for the cable core may be provided. The screen shall be in accordance with 2.2.9 of IEC 61156-1. Where a copper braid is used, it shall have a minimum filling factor of 0,41 (65 % coverage) Where a tape and braid screen is used, the minimum filling factor of the braid shall be 0,16 (30 % coverage). The filling factor is defined in IEC 60096-0-1. 2.2.10 Sheath The sheath material shall consist of a suitable thermoplastic material. Examples of suitable materials are: – polyolefin; – PVC; – fluoropolymer; – low smoke zero halogen thermoplastic material. The sheath shall be continuous, having a thickness as uniform as possible. A non-metallic rip cord may be provided. 2.2.11 Colour of sheath The colour of the sheath shall be agreed between customer and supplier and may be stated in the appropriate detail specification. 2.2.12 Identification Each length of cable shall be identified as to the manufacturer, when required, the year of manufacture, using one of the following methods: a) appropriately coloured threads or tapes; b) printed tape; c) printing on the core cable wrappings; d) marking on the sheath. Additional markings are permitted on the sheath and may be indicated in the appropriate detail specification. 2.2.13 Finished cable The finished cable shall be adequately protected for storage and shipment.