SIST EN 3475-707:2018

Overview

SIST EN 3475-707:2018 is a European Standard developed by CEN specifying test methods for assessing the stabilization of twisted electrical cable assemblies used in aerospace applications. This standard focuses on measuring the stability of twisted assemblies, a critical characteristic for cables with conductor cross-sections up to 1 mm². SIST EN 3475-707:2018 is intended to be used in conjunction with EN 3475-100, which covers general test methods for aerospace electrical cables.

Ensuring the stability of twisted cable assemblies improves electrical performance, mechanical integrity, and reliability in demanding aircraft environments. This standard supports aerospace manufacturers and suppliers in meeting strict quality and performance requirements.

Key Topics

• Scope: Defines the methodology for evaluating the stability of twisted cable assemblies, essential for aerospace cables with conductor sizes up to 1 mm².
• Test Preparation: Specifies specimen preparation from cable reels or coils, requiring minimum deformation to maintain test accuracy. Samples must be cut to (250 ± 10) mm using sharp scissors, ensuring a clean cut.
• Evaluation Method: Visual examination of the cable ends, focusing on the degree of wire splay.
• Acceptance Criteria:
  • Wires shall not splay over a length exceeding half a lay of the cable.
  • Maximum permissible wire splay is limited to three millimeters.
• Normative References: Mandates the application of EN 3475-100 alongside this part for comprehensive test procedures.
• Standardization and Compliance: Approved by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and adopted by multiple European member countries.

Applications

• Aerospace Cable Manufacturing: Provides manufacturers with standardized test methods to verify the mechanical stability of twisted cable assemblies, ensuring high product quality and performance.
• Aircraft Electrical Systems: Supports design validation and quality assurance for electrical wiring systems in aircraft, where cable stability affects reliability and safety.
• Quality Control and Inspection: Utilized by quality departments for routine inspection of cable assemblies, helping detect issues related to conductor splay or improper twisting.
• Certification and Regulatory Compliance: Assists in meeting regulatory standards and customer requirements by following established European aerospace standard test methods.
• Research and Development: Helps R&D teams in evaluating new cable designs or materials for improved twisting stability and durability under operational stresses.

Related Standards

• EN 3475-100: Aerospace series - Cables, electrical, aircraft use - Test methods - Part 100: General test methods, which must be used together with SIST EN 3475-707:2018.
• Other parts of EN 3475 series that address specific test methods and requirements for aerospace electrical cables, ensuring comprehensive standard coverage.
• National and international aerospace cable standards that complement EN 3475-707 for global compliance and compatibility.

Keywords: SIST EN 3475-707:2018, aerospace cables, twisted assembly stability, electrical cable test methods, aircraft electrical wiring, cable splay measurement, aerospace cable standards, ASD-STAN, CEN aerospace standard, cable assembly stabilization.