IEC 61156-5:2020 pdf free download.Multicore and symmetrical pair/quad cables for digital communications – Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz – Horizontal floor wiring – Sectional specification.
IEC 61156-5:2020 describes the cables intended primarily for horizontal floor wiring as defined in ISO/IEC 11801. It covers cable designs comprising individually screened, common screened and unscreened pairs or quads. The transmission characteristics and the frequency range of the cables are specified at 20 °C.
The minimum return loss of any pair in the frequency range indicated in Table 10 shall not be less than the values in Table 10 for the respective categories.
6.4 Mechanical and dimensional characteristics and requirements
Dimensional requirements
The overall diameter of insulation. the nominal thickness of the sheath and the maximum overall diameter of the sheath are not specified, but shall be indicated in the relevant detail specification.
6.4.2 Elongation at break of the conductors
The minimum elongation of the conductor shall be not less than 8%.
6.4.3 Tensile strength of the insulation
The tensile strength of the insulation is not specified, but may be indicated in the relevant detail specification.
6.4.9 Impact test of the cable
The impact resistance of the cable is not specified but may be indicated in the relevant detail specification.
6.4.10 Bending under tension
The bending performance of the cable is not specified but shall be indicated in the relevant detail specification.
6.4.11 Repeated bending of the cable
Not applicable
6.4.12 Tensile performance of the cable
The tensile strength of the cable is not specified but may be indicated in the relevant detail specification.

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