SIST EN 3660-014:2008

Overview

SIST EN 3660-014:2008 is a European standard published by CEN (European Committee for Standardization), detailing the product specifications for aerospace cable outlet accessories. Specifically, this standard covers cable outlets of style A with a 90° bend, designed for unsealed circular and rectangular electrical and optical connectors. These outlets feature a cable tie strain relief mechanism, ensuring secure cable management in aerospace electrical systems.

Designed to operate under extreme temperature conditions, the cable outlets specified in EN 3660-014 are compatible with electrical connectors conforming to EN 3660-002. This standard is essential for designers, manufacturers, and engineers involved in aerospace cable management systems, ensuring reliable and standardized interface accessories critical for aerospace electrical and optical connectivity.

Key Topics

• Scope and Association
  Defines cable outlets in style A, 90° unsealed type with cable tie strain relief, intended for use with EN 3660-002 electrical connectors.

• Temperature Classes

  • Class N: Operational temperature range from −65°C to 200°C
  • Class W: Operational temperature range from −65°C to 175°C

• Dimensions and Design
  The standard specifies detailed dimensional requirements including coupling thread sizes, shell sizes (ranging from 08 to 24), interface dimensions, and spacer pad sizes. Key features include:

  • Thread and coupling nut dimensions conforming to AS85049 interface requirements
  • Wire lock holes for cable securing (max 0.8 mm diameter wire)
  • Design optimized for aerospace electrical and optical connectors

• Material and Finish

  • Class N: Aluminium with electroless nickel finish
  • Class W: Aluminium with olive-drab cadmium plating
  • Spacer pad made from green fluorosilicone to ensure durability under temperature and environmental stress

• Torque and Mechanical Requirements
  The standard specifies assembly torque to guarantee secure installation and coupling thread strength to endure mechanical stress during use and testing.

• Testing and Qualification
  A comprehensive set of tests are prescribed in line with EN 3660-001 and EN 2591 series:

  • Visual and dimensional inspections
  • Electrical continuity and surface impedance tests
  • Environmental endurance including temperature, salt mist, sand/dust, and fluid resistance
  • Mechanical shock, vibration, and endurance testing
  • Magnetic permeability and flammability assessments

• Marking and Identification
  Markings follow conventions detailed in EN 3660-001, with clear identification of material class, shell size, and variant.

Applications

SIST EN 3660-014:2008 cable outlets serve a crucial role in aerospace electrical system design, offering:

• Reliable cable management with 90° angled outlets preventing cable damage and facilitating space-saving routing in confined environments
• Strain relief protection using cable tie accessories to reduce mechanical stresses on connections during flight operation or maintenance
• High-temperature performance enabling applications in harsh aerospace environments, including avionics, satellite systems, and military equipment
• Compatibility with circular and rectangular connectors, allowing seamless integration into established aerospace connector systems
• Standardized interfaces that ensure interchangeability and compliance across manufacturers and operators within the aerospace industry

This standard aids engineers in selecting and specifying cable outlet accessories that meet stringent aerospace requirements for durability, safety, and functionality.

Related Standards

• EN 3660-002: The electrical connector series associated with the cable outlets specified in EN 3660-014
• EN 3660-001: Technical specification standard covering the general requirements and terminology for cable outlet accessories
• EN 2591: Aerospace test methods for electrical and optical connection elements
• AS85049: SAE standard covering general specifications for electrical connector accessories, serving as an interface reference
• EN 3660 Series: Complete aerospace cable outlet product family standards detailing other styles and configurations of connector accessories

Summary

SIST EN 3660-014:2008 defines critical parameters for 90° unsealed cable outlets with cable tie strain relief tailored for aerospace circular and rectangular connectors. Meeting this standard ensures high performance in extreme temperature ranges, mechanical resilience, and compatibility with widely used aerospace connector systems. By adhering to EN 3660-014, aerospace manufacturers and maintainers guarantee standardized, tested, and reliable cable outlet accessories essential for safe and efficient aerospace electrical operations.