EN 3660-026:2009

Overview

EN 3660-026:2009 is a European standard developed by CEN that specifies the product requirements for cable outlet accessories used in aerospace applications. This standard covers Cable Outlet, Style A, 90° unsealed, designed specifically for circular and rectangular electrical and optical connectors according to EN 3646. It includes provisions for cable tie strain relief to ensure reliability under demanding aerospace conditions.

The cable outlets covered by this standard are compatible with the associated connector EN 3660-002 and are designed to operate efficiently within defined temperature classes:

• Class A and Class N: −65 °C to 200 °C
• Class W: −65 °C to 175 °C

This product standard ensures uniformity in dimensions, materials, mechanical performance, and marking, supporting safety and interchangeability in aerospace electrical systems.

Key Topics

• Product Scope
  Defines 90° cable outlets, Style A, for aerospace electrical and optical connectors, focusing on unsealed designs with cable tie strain relief.

• Material and Finish
  Three material/finish classes are specified:

  • Class A: Aluminium with black anodised finish
  • Class N: Aluminium with electroless nickel plating
  • Class W: Aluminium with olive drab cadmium plating

• Dimensions and Interface
  Comprehensive dimensioning including shell sizes 08 to 24, thread specifications, interface teeth dimensions, and cable tie areas ensure compatibility and ease of installation.

• Mechanical and Environmental Tests
  The standard mandates rigorous qualification tests covering:

  • Visual and dimensional examination
  • Electrical continuity and impedance
  • Temperature endurance and rapid temperature changes
  • Resistance to salt mist, sand, dust, fluids, ozone, and fire
  • Shock, vibration, locking wire hole strength, and magnetic permeability

• Assembly and Coupling Torque
  Defined torque specifications for installation and testing guarantee reliable mechanical performance without component damage.

• Marking and Identification
  Cable outlets must be clearly marked according to EN 3660-001, facilitating traceability and compliance verification.

Applications

EN 3660-026:2009 cable outlet accessories are crucial components in aerospace electrical and optical systems where secure, durable, and high-reliability cable connections are mandatory. Applications include:

• Aircraft Wiring Harnesses
  Ensuring stable cable exits from connectors under extreme temperature and mechanical stress conditions.

• Defense and Space Systems
  Supporting rugged aerospace environments requiring consistent strain relief and connection integrity.

• Circular and Rectangular Connector Systems
  Compatible with standardized aerospace connector families requiring unsealed, angular cable outlets with strain relief.

These products help prevent cable damage from mechanical strain, preserve signal integrity, and maintain safety standards in critical aerospace electrical systems.

Related Standards

• EN 3660-001: Technical specification for cable outlet accessories-provides general requirements and definitions applicable to EN 3660-026.
• EN 3660-002: Index of product standards for cable outlet accessories-defines the associated electrical and optical connectors to which EN 3660-026 outlets attach.
• EN 3660-036: Details on accessory parts like spacer pads related to cable outlets.
• EN 2591-100: Test methods for aerospace electrical and optical connection elements-covers testing protocols referenced for qualification.
• EN 3646: Defines the series of circular and rectangular connectors compatible with cable outlets.

Keywords: aerospace cable outlets, cable outlet accessories, unsealed cable outlet, strain relief, round and rectangular connectors, EN 3660-026, cable tie strain relief, aerospace electrical connectors, temperature class cable outlets, electrical connector accessories, CEN aerospace standards