IEC 60794-1-211-2021 pdf free.Optical fibre cables – Part 1-211: Generic specification – Basic optical cable test procedures – Environmental test methods – Sheath shrinkage, method F11.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
IEC 60794-1-1, Optical fibre cables — Part 1-1: Generic specification — General
IEC 60794-1-22:2017, Optical fibre cables — Part 1-22: Generic specification — Basic optical cable test procedures — Environmental test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60794-1-1 apply.
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4 Method FIIA — Sheath shrinkage (cables to be terminated with connectors)
4.1 Objective
The purpose of this test is to measure the shrinkage behaviour of the sheath due to thermal exposure of cables intended to be terminated with connectors.
This test is not intended for connectorised cable assemblies.
See Annex A for a comparison between method F11A and method F11B.
4.2 Sample
A 2 m length of cable shall be cut from the end of the cable and discarded in order to avoid end effects. The test sample lengths shall be cut from the adjoining cable. Five test samples of the length specified in the detail specification shall be cut from the cable.
— For test samples of a nominal 1 m length, cut 1 050 mm ± 5 mm.
— For test samples of a nominal length of 150 mm, cut 160 mm ± 5 mm.
4.3 Apparatus
A horizontal surface where the test samples are placed that permit free movement of the sheath. For example, talc, paper or paper dusted with talc on the surface permits free movement of the sheath.
A temperature chamber of appropriate size and a temperature sensing device. The temperature chamber shall be able to accommodate the test samples and maintain the specified temperature within ±3 °C.
A length measuring device of sufficient length with a minimum resolution of 1 mm for a sample with a nominal 1 m length, or 0,15 mm for a sample with a nominal 150 mm length.
4.4 Procedure
The cable on the supply reel, or alternatively the cable coil, shall be conditioned for 24 h at ambient temperature before cutting the test samples.
Two marks separated by the distance of the nominal test length per the detail specification (e.g. 1 000 mm, 150 mm), with a deviation not greater than ±1 mm, shall be applied to each test sample, as shown in Figure 1.
Alternatively, the sample ends may be cut to the measurement length. L1, using a razor knife. This alternative is best suitable for a short sample length of 150 mm. Two marks longitudinally to the cable axis shall be applied to both ends of each test sample to indicate the measurement points, as shown in Figure 2.IEC 60794-1-211 pdf free download.