Overview
IEC 61300-2-37:2016 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the test procedures for evaluating the effectiveness of sealing and clamping hardware in fibre optic closures under cable bending conditions. This standard is part of the IEC 61300 series which covers basic test and measurement procedures for fibre optic interconnecting devices and passive components.
The third edition of IEC 61300-2-37 (2016) revises and updates the second edition from 2006, introducing significant technical changes including updated test clauses and the addition of bending severities influenced by factors such as bending direction, number of bends, test temperature, and overpressure conditions adhering to environmental categories described in IEC 61753-1.
Key Topics
Purpose and Scope
The standard addresses the impact of cable bending on the sealing integrity and mechanical reliability of fibre optic closures. It is designed to simulate real-world conditions where cables entering or exiting closures are subjected to bending stresses. The main goals include:
- Testing sealing and clamping hardware effectiveness to prevent water and dust ingress.
- Assessing structural durability of the closure and cable interface under bending cycles.
Test Procedure
The testing involves placing the device under test (DUT)-an assembled fibre optic closure with cables-into a climatic chamber. The cable undergoes controlled bending cycles defined as bending the cable in one direction, then bending it back equally in the opposite direction, and returning to the neutral position.
Key components of the procedure include:
- Sample Preparation: DUTs are assembled using cables with minimum and maximum diameters as per design specifications.
- Holding Fixture and Bending Device: These secure and bend the cable at a defined distance from the closure, typically 400 mm except for larger diameter cables.
- Conditioning: Testing occurs under specified environmental conditions, using the climatic chamber to simulate various temperatures and pressures.
- Evaluation: Post-test examinations check for damage, seal integrity loss, and hardware failure within the closure.
Severity Levels
IEC 61300-2-37:2016 introduces severity classifications that depend on variables such as:
- Number and direction of cable bends.
- Test environmental category (temperature, pressure).
- Overpressure conditions compliant with IEC 61753-1.
This layering ensures standardized testing respects the operational environments closures will encounter.
Applications
The IEC 61300-2-37 standard is essential in the design, manufacturing, and quality assurance of fibre optic closures. Its practical applications include:
- Manufacturing Testing: Ensures closures meet resilience requirements for sealing hardware and cable retention under mechanical stress.
- Product Development: Assists engineering teams in validating new closure designs against standardized bending stresses.
- Quality Control: Facilitates consistent checks during production to confirm compliance with international performance criteria.
- Installation Guidelines: Provides data supporting recommendations on cable handling and bending limits to maintain closure integrity in the field.
- Certification and Compliance: Supports conformance verification processes for global markets requiring IEC standard adherence.
Related Standards
Compliance with IEC 61300-2-37 is complemented by referencing the following associated IEC standards:
- IEC 61300-1: General guidance on basic test and measurement procedures for fibre optic interconnecting devices and passive components.
- IEC 61300-2-38: Tests for sealing performance of pressurized fibre optic closures.
- IEC 61300-3-1: Visual examination protocols to detect physical defects.
- IEC 61300-3-28: Measurement techniques for transient loss in fibre optic components.
- IEC 61753-1: Environmental categories specification for fibre optic components subjected to outdoor and climatic influences.
Together, these standards establish a comprehensive framework for testing, evaluating, and certifying fibre optic closures to ensure reliability and longevity in telecommunications and data networks.
Keywords: IEC 61300-2-37, fibre optic closures, cable bending test, sealing hardware effectiveness, fibre optic interconnecting devices, passive components, cable bending severity, optical fibre closure testing, IEC standards for fibre optics, environmental testing for fibre optic closures.
Open preview (PDF)Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-37: Tests - Cable bending for fibre optic closures
