SIST EN 3660-012:2008

Overview

SIST EN 3660-012:2008 is a European product standard developed by CEN for the aerospace sector, focusing on cable outlet accessories for circular and rectangular electrical and optical connectors. This specific part of the standard defines the requirements for grommet nut, style A, designed for use with connectors conforming to EN 3372 and referenced in EN 3660-002. The standard details critical aspects such as interface dimensions, material and finish, torque values, and qualification test methods, ensuring compatibility, reliability, and safety in aerospace electrical systems.

Key Topics

• Scope and Compatibility

  • Specifies grommet nut, style A, for use with EN 3372 connectors, catalogued in EN 3660-002.
  • Intended for aerospace applications requiring secure cable termination and environmental sealing.

• Temperature Classification

  • Class N: Operates effectively from -65°C to +200°C.
  • Class W: Operates from -65°C to +175°C.
  • Temperature class selection ensures suitability across diverse aerospace environments.

• Construction and Materials

  • Class N grommet nuts: Aluminium with electroless nickel finish.
  • Class W grommet nuts: Aluminium with olive drab cadmium plating.
  • Material and finish are specified for corrosion resistance and durability.

• Mechanical and Environmental Testing

  • Design and performance verified against EN 2591 and EN 3660-001.
  • Includes tests for endurance, shock, vibration, fluid resistance, salt mist, ozone, flammability, fire resistance, and mechanical strength.

• Interconnection and Interface

  • Fully compatible with internationally recognized aerospace connector standards.
  • Detailed dimensional specifications ensure proper fit and function in multi-system installations.

Applications

• Aircraft Electrical and Optical Systems

  • Enables secure and environmentally sealed cable terminations in avionics, power systems, and data transmission lines.
  • Suitable for both circular and rectangular connector configurations.

• Aerospace Equipment Manufacturing

  • Used by original equipment manufacturers (OEMs) and maintenance, repair, and overhaul (MRO) service providers to meet stringent international standards for connector accessories.

• System Integration

  • Facilitates modular assembly and reliable interface between cables and connectors, reducing maintenance time and improving operational reliability.

• Environmental Protection

  • Ensures resistance to temperature fluctuations, humidity, salt mist, and other harsh conditions typical of aerospace environments.

Related Standards

• EN 3660-001: Cable outlet accessories for circular and rectangular electrical and optical connectors – Technical specification. Provides general requirements for outlets and accessories.
• EN 3660-002: Index of product standards for cable outlet accessories, indexing all related parts and variants.
• EN 2591: Aerospace series – Elements of electrical and optical connection – Test methods. Specifies the testing regime for connector components.
• AS85049: Connector accessories, electrical general specification. Reference standard for international compatibility, published by the Society of Automotive Engineers (SAE).
• EN 3372: Aerospace series – Electrical connectors, associated hardware.

By following SIST EN 3660-012:2008, aerospace organizations can ensure compliant selection and installation of grommet nuts for electrical and optical connectors. This supports not only the longevity and dependability of aircraft systems but also harmonizes component selection across supply chains in the European and global aerospace industries.