IEC 61156-6 pdf download.Multicore and symmetrical pair/quad cables for digital communications
1.1 Scope This sectional specification relates to IEC 61156-1: Multicore and symmetrical pair/quad cables for digital communications – Part 1: Generic specification. The cables described herein are specifically intended to construct patch, equipment, and work area cords for class D, E and F channels, as defined in IEC 11801:2000, Information technology – Generic cabling for customer premises (see Table 1). It covers individually screened (STP), common screened (FTP) and unscreened (UTP) pairs or quads having a pair count of four pairs or less. The transmission characteristics of the cables are specified at 20 °C. See Annex A of IEC 61156-5 for a discussion of cable performance at temperatures higher than 20 °C. The designation “Category 5e” is used herein to describe an enhanced Category 5 cable and is used in the same context as “Category 5” in ISO/IEC 11801. This enhanced cable is designated Category 5e to differentiate it from the Category 5 cables described in IEC 61156-2, 61156-3, and 61156-4. Although both Category 5 and 5e cables are characterized to 100 MHz and can in used for Class D channels, Category 5e has additional requirements, as compared to Category 5, which make it preferred for use in systems utilizing four pairs transmitting simultaneously in both directions.These cables are intended for various new communication systems that are under development and which use as many as four pairs simultaneously. In this sense, this sectional specification provides the cable characteristics required by system developers to evaluate new systems. The cables covered by this sectional specification are intended to operate with voltages and currents normally encountered in communication systems. These cables are not intended to be used in conjunction with low impedance sources, for example, the electric power supplies of public utility mains. Though the recommended temperature range during installation is 0 °C +50 °C, the actual temperature range during installation should be indicated in the detail specification.
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 relevant detail specification. 2.2.3 Conductor The conductor shall be solid or stranded annealed copper conductor, in accordance with 2.2.3 of IEC 61156-1 and shall have a nominal diameter between 0,4 mm to 0,65 mm. The stranded conductor should have preferably seven strands. Conductor diameter up to 0,8 mm may be used if compatible with the connecting hardware. 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 helically over a fibrous thread (tinsel cord). In this case, 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; – 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 the insulation shall be compatible with the method of conductor termination. 2.2.5 Colour code of insulation The colour code is not specified but shall be indicated in the relevant 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.