EN 3375-004:2007

Overview

EN 3375-004:2007 is a European standard developed by CEN that defines the product specifications for aerospace-grade electrical cables designed for digital data transmission. Specifically, it covers the double braid, 77 Ohms, size 24 electrical cable type WJ. This standard ensures that cables meet stringent requirements critical for aerospace applications, balancing electrical performance, mechanical durability, and environmental resistance.

This standard must be used in conjunction with EN 3375-001 and EN 3375-002, which provide technical specifications and general requirements for aerospace digital data transmission cables. It covers essential aspects such as physical dimensions, electrical properties, testing protocols, quality assurance, marking, and packaging.

Key Topics

• Cable Construction and Dimensions
  The cable features two conductors (AWG 24) with fluorocarbon insulation, surrounded by dual braided copper screens with tin or silver plating options and an outer fluorocarbon jacket. Detailed dimensions and mass specifications are provided to ensure consistency.

• Electrical Performance Characteristics

  • Nominal impedance: (77 ± 7) Ohms at 1 MHz
  • Capacitance: max 78 pF/m, nominal 70 pF/m
  • Attenuation: max 3.6 dB/100m at 1 MHz
  • Transfer impedance values across DC to 30 MHz frequencies are specified
  • Peak voltage rating: 600 V AC

• Environmental and Mechanical Properties

  • Operating temperature ranges:
    • Tin plated braid: −65 °C to +150 °C
    • Silver plated braid: −65 °C to +200 °C
  • Minimum bend radius: 26 mm
  • UV laser markable jacket for traceability
  • Twisting pitch between 8x to 16x the cable diameter for mechanical flexibility

• Comprehensive Testing Requirements
  The standard mandates a rigorous battery of tests aligned with EN 3375-001 and EN 3475-100 including:

  • Visual inspection and dimensional verification
  • Electrical testing for resistance, insulation, and voltage proof
  • Mechanical tests encompassing bending, abrasion, and cold bend
  • Environmental endurance such as accelerated aging and humidity resistance
  • Safety tests like smoke density and toxicity under fire conditions

• Identification and Marking System
  Marking requirements ensure clear identification of the cable type, braid nature (tin or silver plating), and jacket color codes (green, red, blue) aligned with EN 3375-002 and TR 6058. This facilitates traceability and proper deployment in aerospace environments.

Applications

EN 3375-004:2007 cables are specifically designed for use in aerospace and defense industries where reliable digital data transmission is critical. Typical applications include:

• Avionics systems requiring stable, low impedance cabling for digital communication
• In-flight data networks for sensors, control units, and communication devices
• Mission-critical aerospace electrical harnesses operating under harsh environmental conditions
• Digital interconnections demanding high resistance to temperature extremes, mechanical stress, and electromagnetic interference (EMI)

This product standard supports the development of aerospace wiring systems that adhere to international compliance requirements, helping manufacturers achieve certification and ensuring operational safety and performance.

Related Standards

• EN 3375-001: Aerospace series - Cable, electrical, for digital data transmission - Part 001: Technical specification
  Provides the overarching technical requirements for digital data cables in aerospace use.

• EN 3375-002: Aerospace series - Cable, electrical, for digital data transmission - Part 002: General
  Covers general principles and provisions applicable to the entire series of cables.

• EN 2083 & EN 2084: Aerospace series - Copper conductors and cables
  Define conductor materials and specifications critical for cable core quality.

• EN 2235: Aerospace series - Single and multicore electrical cables
  Provides specifications relevant to screening and jacketing, integral to cable integrity.

• EN 3475-100: Aerospace cables - Test methods - Part 100: General
  Specifies test procedures referenced throughout the product standard.

• EN 9133: Aerospace series - Quality management systems
  Establishes the quality assurance framework required for aerospace standard components.

By following EN 3375-004:2007 along with these related standards, aerospace manufacturers ensure their digital data transmission cables meet industry-leading benchmarks for durability, performance, and safety.

Keywords: aerospace cable standard, digital data transmission cable, double braid cable, 77 Ohms cable, EN 3375-004, aerospace electrical wiring, aerospace cable certification, fluorocarbon insulation cable, aerospace data cable testing, aerospace cable identification, electromagnetic interference shielding cable