IEC 60794-1-211:2021 pdf free download

IEC 60794-1-211:2021 pdf free download Optical fibre cables – Part 1-211: Generic specification – Basic optical cable test procedures – Environmental test methods – Sheath shrinkage, method F11
1 scope
This part of lEC 60794 defines test procedures to measure the shrinkage of the sheath due tothermal exposure of cables.
A first test method,F11A, is included for cables where the fibre or buffered fibre and the sheathof the cable are intended to be fully terminated into a connector at one or both cable ends.
A second test method,F11B, is included in this document for sheath shrinkage testing forgeneral purpose.
See lEC 60794-1-2 for a reference guide to test methods of all types and for generalrequirements.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.For dated references, only the edition cited applies.For undated references,the latest edition of the referenced document (including anyamendments) 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 opticalcable test procedures – Environmental test methods
3Terms and definitions
For the purposes of this document, the terms and definitions given in lEC 60794-1-1 apply.
lSo and lEc maintain terminological databases for use in standardization at the followingaddresses:
IEC Electropedia: available at http://www.electropedia.orgl
Iso Online browsing platform: available at http://www.iso.org/obp
4Method F11A – Sheath shrinkage (cables to be terminated with connectors)
4.1Objective
The purpose of this test is to measure the shrinkage behaviour of the sheath due to thermalexposure of cables intended to be terminated with connectors.
See Annex A for a comparison between method F1 1 A and method F1 1 B.
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 1 50 mm, cut 1 60 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.