oSIST prEN 3475-203:2026

Overview

oSIST prEN 3475-203:2026 is a European draft standard developed by CEN under ASD-STAN for the aerospace industry. It defines precise test methods for measuring the dimensions of electrical cables and conductors intended for aircraft use. The standard ensures consistent and accurate dimensional verification essential for safety, quality, and compliance within aerospace electrical systems. This standard is intended to be used alongside EN 3475-100, which covers general test methods for aircraft cables.

The document emphasizes reliable measurement techniques and apparatus specifications, including micrometers and profile projectors. It addresses conductor diameter, insulation and jacket thickness, as well as overall external cable diameter, contributing to the robustness of cable manufacturing and quality assurance processes in aviation.

Key Topics

• Conductor Dimension Measurement
  • Verification of strand count, nominal strand diameter, and conductor diameter.
  • Measurements taken at multiple points along a straightened conductor using precise flat-ended micrometers.
• Insulation and Jacket Thickness
  • Testing wrapped insulation or jackets including number of layers, tape sealing, tape overlap, and minimum thickness (including sealed materials such as PTFE).
  • Extruded insulation or jackets measured at their thinnest and thickest radial points to ensure uniformity.
  • Use of averaged thickness values over four 90-degree interval measurements around the cable circumference.
• External Diameter Assessment
  • Detailed methods for single insulated wires or cables, and for non-cylindrical cable constructions.
  • Multiple measurement locations along the cable length with micrometers or profile projectors.
• Equipment Specifications
  • Requirements for measuring instruments with at least 5 mm diameter flat ends for single cables and 15 mm for multi-conductor cables.
  • Instruments must allow measurements with accuracy to 0.01 mm.

Applications

This standard is crucial for manufacturers and quality control laboratories involved in producing and testing aerospace electrical cables. Accurate dimensional measurement ensures:

• Compliance with aerospace industry standards and safety regulations.
• Compatibility with aircraft installation requirements where precise cable dimensions affect performance and integration.
• Assurance that insulation and jacketing meet design and environmental protection specifications, preventing failures related to improper thickness or sealing.
• Support for product development, certification, and production quality monitoring in aerospace cable manufacturing.

Use of oSIST prEN 3475-203:2026 helps maintain uniformity across suppliers and across multiple countries adhering to CEN standards, ultimately enhancing safety and reliability of aircraft electrical systems.

Related Standards

• EN 3475-100 - Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General
  Provides general test methods applying to all aircraft electrical cables and complements the dimension-specific procedures of oSIST prEN 3475-203:2026.

• Other Aerospace Cable Standards
  Various parts of the EN 3475 series specify additional test methods, material requirements, and performance criteria relevant to aerospace electrical cables.

• ISO and IEC Terminology Resources
  For standardized definitions and terminology, references to ISO Online Browsing Platform and IEC Electropedia are recommended to maintain consistency in standardization documentation.

Keywords: aerospace cables, electrical aircraft cables, cable dimension measurement, conductor diameter test, insulation thickness test, aircraft cable standards, oSIST prEN 3475-203:2026, CEN aerospace standards, PTFE cable insulation, aerospace electrical connector compliance, aviation cable quality control, cable external diameter testing.