IEC 60794-1-107:2025 PDF

Optical fibre cables - Part 1-107: Generic specification - Basic optical cable test procedures - Mechanical test methods - Torsion, method E7

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Title (English):

IEC 60794-1-107:2025

Optical fibre cables - Part 1-107: Generic specification - Basic optical cable test procedures - Mechanical test methods - Torsion, method E7

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 10
Publication date:: October 17, 2025
Edition:: IEC IS 60794 edition 1 version 1
ICS:: 33.180.10

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Description (English):

IEC 60794-1-107:2025 applies to optical fibre cables for use with telecommunication equipment and devices employing similar techniques, and to cables having a combination of both optical fibres and electrical conductors. This document defines test procedures used in establishing uniform requirements for torsion performance. Refer to IEC 60794-1-2 for a reference guide to test methods and for general requirements and definitions. NOTE Throughout this document, the wording "optical cable" also includes optical fibre units, microduct fibre units, etc. This first edition partially cancels and replaces IEC 60794-1-21:2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 60794-1-21:2015: a) Update of the typical test length according to the different types of cables; b) Update of Figure 2 by loading weights to cable gripping fixture.

Technical details

Technical committee: SC 86A - Fibres and cables
SKU: IEC 60794-1-107:2025

Abstract

Overview

IEC 60794-1-107:2025 - "Optical fibre cables - Part 1‑107: Basic optical cable test procedures - Mechanical test methods - Torsion, method E7" is an IEC international standard that defines a uniform test method to evaluate the torsion performance of optical fibre cables. The procedure measures variation in fibre attenuation and checks for physical damage when a cable is subjected to mechanical twisting. This edition (2025) is a technical revision that replaces method E7 from IEC 60794‑1‑21:2015 and updates typical test lengths and the torsion apparatus loading arrangement.

Key topics and technical requirements

Scope: Applies to optical fibre cables used with telecommunication equipment, including cables with combined optical and electrical conductors; the term “optical cable” covers fibre units and microduct fibre units.
Objective: Measure change in attenuation and detect physical damage under torsional stress.
Apparatus:
- Two cable grips (one fixed, one rotatable) with adjustable separation.
- Rotating clamp driven by torquing equipment (e.g., torquing lever).
- Optional tensioning/loading weights to minimize sag and simulate installation conditions.
- Optical attenuation measurement equipment per IEC 60793‑1‑46:2024 (change in attenuation by transmitted power).
Procedure highlights:
- Test length L is specified by cable type (see Table 1). Examples: outdoor stranded armored ≤ 10.0 m; most cables = 125 × diameter but with upper/lower limits per cable class.
- One cycle = 180° clockwise → return → 180° counterclockwise → return; typically 10 cycles, each cycle completed within 1 minute (unless otherwise agreed).
- Measure attenuation after clamping and in the first and last cycles at extreme positions held for ≥10 s.
- Allow sample to rest ≥5 min before final measurements and visual inspection.
Acceptance criteria: Defined by the relevant product/specification; typical failure modes: loss of optical continuity, increased fibre loss, and damage to sheath or core components.
Information to specify/report: cable description, test length, applied tension, number of cycles, fibres monitored, maximum allowable attenuation change, rotating angle, cycle time, and test temperature.

Applications and users

Primary users: cable manufacturers, independent test laboratories, telecommunications equipment vendors, procurement and QA teams, R&D and product development engineers.
Practical uses:
- Validate cable design against installation twisting and handling stresses.
- Establish supplier/acceptance test criteria for contract specifications.
- Investigate field failures related to torsional loads.

Related standards

IEC 60794-1-2 - reference guide to test methods, general requirements and definitions.
IEC 60793-1-46:2024 - method for monitoring changes in attenuation (used for optical measurements in E7).

Keywords: IEC 60794-1-107:2025, torsion method E7, optical fibre cables, torsion test, cable torsion, attenuation change, mechanical test methods.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope: Applies to optical fibre cables used with telecommunication equipment, including cables with combined optical and electrical conductors; the term “optical cable” covers fibre units and microduct fibre units.
Objective: Measure change in attenuation and detect physical damage under torsional stress.
Apparatus:
- Two cable grips (one fixed, one rotatable) with adjustable separation.
- Rotating clamp driven by torquing equipment (e.g., torquing lever).
- Optional tensioning/loading weights to minimize sag and simulate installation conditions.
- Optical attenuation measurement equipment per IEC 60793‑1‑46:2024 (change in attenuation by transmitted power).
Procedure highlights:
- Test length L is specified by cable type (see Table 1). Examples: outdoor stranded armored ≤ 10.0 m; most cables = 125 × diameter but with upper/lower limits per cable class.
- One cycle = 180° clockwise → return → 180° counterclockwise → return; typically 10 cycles, each cycle completed within 1 minute (unless otherwise agreed).
- Measure attenuation after clamping and in the first and last cycles at extreme positions held for ≥10 s.
- Allow sample to rest ≥5 min before final measurements and visual inspection.
Acceptance criteria: Defined by the relevant product/specification; typical failure modes: loss of optical continuity, increased fibre loss, and damage to sheath or core components.
Information to specify/report: cable description, test length, applied tension, number of cycles, fibres monitored, maximum allowable attenuation change, rotating angle, cycle time, and test temperature.

Applications and users

Primary users: cable manufacturers, independent test laboratories, telecommunications equipment vendors, procurement and QA teams, R&D and product development engineers.
Practical uses:
- Validate cable design against installation twisting and handling stresses.
- Establish supplier/acceptance test criteria for contract specifications.
- Investigate field failures related to torsional loads.

Related standards

IEC 60794-1-2 - reference guide to test methods, general requirements and definitions.
IEC 60793-1-46:2024 - method for monitoring changes in attenuation (used for optical measurements in E7).

Keywords: IEC 60794-1-107:2025, torsion method E7, optical fibre cables, torsion test, cable torsion, attenuation change, mechanical test methods.

IEC 60794-1-107:2025 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and users

Related standards

Related standards

Optical fibre cables - Part 1-21: Generic specification - Basic optical cable test procedures - Mechanical te…

Optical fibres - Part 1-46: Measurement methods and test procedures - Monitoring of changes in attenuation

Optical fibre cables - Part 1-210: Generic specification - Basic optical cable test procedures - Environmenta…