BS EN IEC 60794-1-308:2023

1   Scope

  This part of [IEC 60794](/search?q=IEC%C2%A060794)
   describes test procedures to evaluate the degree of permanent twist in an uncabled
  ribbon or in a cabled optical fibre ribbon. 
This document applies to optical fibre ribbons in optical cables for use with telecommunication
  equipment and devices employing similar techniques, and to optical fibre ribbons in
  cables having a combination of both optical fibres and electrical conductors. 
This document is not applicable to partially-bonded ribbons. The method for partially-bonded
  ribbons is under consideration. 
Throughout the document, the wording "optical cable" can also include optical fibre
  units, microduct fibre units, etc. 

    NOTE  The environmental testing of optical fibre ribbon would be valuable for some applications.
     Useful information about suitable test methods can be found in the optical fibre standards
     [IEC 60793‑1‑50](/search?q=IEC%C2%A060793%E2%80%911%E2%80%9150), [IEC 60793‑1‑51](/search?q=IEC%C2%A060793%E2%80%911%E2%80%9151), [IEC 60793‑1‑52](/search?q=IEC%C2%A060793%E2%80%911%E2%80%9152), and [IEC 60793‑1‑53](/search?q=IEC%C2%A060793%E2%80%911%E2%80%9153).