IEC 60794-2-50:2023

Overview - IEC 60794-2-50:2023 (Optical fibre cables - Indoor simplex & duplex)

IEC 60794-2-50:2023 is the third edition family specification that defines construction, mechanical, environmental, transmission and fire‑performance requirements for indoor simplex and duplex optical fibre cables intended for use in terminated cable assemblies (patchcords, pigtails) or for termination of passive components. This 2023 technical revision updates test references and performance limits to reflect current indoor application needs and laboratory test practice.

Key topics and technical requirements

• Scope and constructions: Requirements for optical fibres, primary coating, buffer/tube, strength and anti‑buckling members, sheath materials and marking for simplex and duplex formats.
• Mechanical tests: Tensile (now with a 10 min load duration), crush, impact, repeated bending, bend and torsion (clamp spacing clarified to 125 × cable diameter, minimum 0.3 m), kink, sheath pull‑off, abrasion and buffered‑fibre movement under compression.
• Environmental tests: Temperature cycling and recommended test temperatures for indoor cables (default −10 °C and +60 °C). The edition aligns temperature cycling/shrinkage testing with operating environments in IEC 61753‑1 for categories C, CHD, OP and OPHD.
• Sheath shrinkage: Updated to use IEC 60794‑1‑211 (F11A) method with a maximum shrinkage requirement of 20 mm.
• Transmission & fire performance: Transmission limits and an improved description of fire performance requirements for indoor applications are included.
• Normative references: Added references such as IEC 60793‑1‑46 (monitoring optical transmittance changes) and IEC 60794‑1‑211 (sheath shrinkage).

Practical applications and users

This standard is intended for:

• Cable designers and manufacturers producing indoor simplex and duplex cables for patchcords, pigtails and terminated assemblies.
• Test laboratories and quality assurance teams validating mechanical, environmental and shrinkage performance.
• Component suppliers, integrators and spec writers ensuring compliance for data‑centre, premise wiring, telecom and AV installations.
• Procurement and compliance officers specifying performance criteria for indoor optical connectivity.

Using IEC 60794‑2‑50:2023 helps ensure cables meet harmonized mechanical, environmental and fire expectations for reliable indoor terminated assemblies.

Related standards (select)

• IEC 60794 series - Optical fibre cables (generic and sectional specifications)
• IEC 60794‑1‑21 / ‑1‑22 / ‑1‑23 - Basic cable test procedures (mechanical, environmental, element tests)
• IEC 60794‑1‑211 - Sheath shrinkage (F11A)
• IEC 60793‑1‑46 - Monitoring changes in optical transmittance
• IEC 61753‑1 - Operating service environment categories

Keywords: IEC 60794-2-50, optical fibre cables, indoor simplex duplex cables, terminated cable assemblies, tensile test 10 min, torsion clamp distance, sheath shrinkage 20 mm, fire performance.