SIST EN 3475-405:2004

Overview

SIST EN 3475-405:2004 is a European standard under the aerospace series that defines test methods for electrical cables used in aircraft. Specifically, Part 405 focuses on assessing the bending behavior of electrical cables at ambient temperature. This standard is designed to ensure that aerospace cables maintain their integrity and performance after being subjected to bending stresses, a common condition in aircraft environments.

The standard is intended to be used alongside EN 3475-100, which provides general test methods for aerospace electrical cables. Together, these standards ensure comprehensive testing protocols for cable durability and safety in aircraft applications.

Key Topics

• Test Purpose
  SIST EN 3475-405:2004 specifies a method to determine how an electrical cable behaves after undergoing a bending test at ambient temperature, replicating operational stresses during installation and use.

• Specimen Preparation
  A cable specimen must be at least 750 mm long and representative of the finished product to ensure accurate test results.

• Test Apparatus
  The bending test requires a horizontally supported mandrel. The correct mandrel diameter and load weight are supplied according to the cable's technical specifications.

• Bending Procedure
  The cable is fixed at one end, loaded at the other, and wound around the mandrel between two and three turns per minute, covering the entire length of the specimen. This winding and unwinding cycle is repeated twice to simulate bending in both directions.

• Performance Requirement
  After bending, the cable must pass a voltage proof test following EN 3475-302 to confirm electrical insulation integrity.

• Normative References
  Compliance with EN 3475-100 (general test methods) and EN 3475-302 (voltage proof test) is mandatory.

Applications

• Aircraft Electrical Cable Testing
  This standard provides aerospace manufacturers, cable producers, and quality control laboratories with a reliable method to evaluate cable flexibility and mechanical strength under bending stresses common in aircraft.

• Quality Assurance
  Ensures cables maintain electrical performance and mechanical durability after bending, critical for safe and reliable aircraft electrical systems.

• Design Validation
  Supports aerospace engineers in validating cable designs against bending fatigue and mechanical deformation within aircraft environmental conditions.

• Compliance and Certification
  Helps manufacturers meet European aerospace industry requirements and facilitates harmonized certification processes for electrical cables used in aircraft.

Related Standards

• EN 3475-100: Aerospace Electrical Cables – General Test Methods
  Defines the overall framework and general principles for testing aerospace electrical cables, supplementary to Part 405.

• EN 3475-302: Aerospace Electrical Cables – Voltage Proof Test
  Specifies the test to verify an electrical cable’s insulation integrity after physical stress, such as bending.

• Other Aerospace Cable Test Methods in EN 3475 Series
  Includes additional parts covering various electrical, mechanical, and environmental tests relevant to aerospace cable reliability.

Keywords: EN 3475-405, aerospace cables, electrical cables, aircraft use, cable bending test, ambient temperature, aerospace standards, cable test methods, EN 3475-100, voltage proof test, EN 3475-302, aircraft cable testing, cable durability, aerospace electrical systems, CEN standards.