SIST EN 3373-013:2006

Overview

SIST EN 3373-013:2006 is a European aerospace standard specifying in-line splices that are insulated and moisture resistant for crimping on nickel plated copper conductors. Designed for high-temperature applications up to 260 °C, this product standard ensures reliable and durable electrical connections in aerospace environments. The standard is part of the aerospace series guidelines for terminal lugs and splices used on electric conductors and should be applied alongside EN 3373-001 for technical specifications.

Key Topics

• Temperature Range
  The in-line splices are engineered to operate reliably in temperatures from -65 °C up to a maximum of 260 °C, suitable for extreme aerospace conditions.

• Materials

  • Insulating Sleeve: Made from heat-shrinkable polytetrafluoroethylene (PTFE) with a meltable fluorinated ethylene propylene (FEP) inner sleeve for effective moisture sealing and insulation.
  • Crimp Barrel: Composed of copper alloy per ASTM B 75 and nickel plated in accordance with QQ-N-290A, enhancing corrosion resistance and electrical performance.

• Design and Dimensions
  Available in multiple sizes covering a range of conductor diameters (26 AWG to 12 AWG), with color-coded bands (red, blue, yellow) indicating the specific type and size of the splice.

• Testing and Compliance

  • Moisture resistance tested per MIL-STD-202 Method 106F ensures dielectric withstand voltage of 2,500 V DC and insulation resistance above 5,000 MΩ after humidity conditioning.
  • Temperature change tested per EN 2591-305 with operational assurance down to -65 °C.
  • Quality assurance processes align with EN 3373-001 to maintain consistent product reliability.

• Assembly Tooling
  Crimping tools must conform to MIL-DTL-22520/37 standards, and heat application requires hot air heaters ranging from 320 °C to 380 °C with appropriate safety features to avoid damage and hazardous conditions.

• Marking and Packaging
  Crimp barrels feature color bands for immediate identification, and packaging includes EN standard designation, manufacturer details, part number, quantity, and batch information for traceability.

Applications

SIST EN 3373-013:2006 compliant in-line splices are critical for aerospace electrical wiring systems where environmental resistance and durability are paramount. Typical applications include:

• Aircraft power and signal wiring harnesses requiring moisture and heat resistance.
• High-temperature zones within aerospace systems, such as engine compartments and avionics bays.
• Electrical installations demanding consistent performance under harsh temperature cycles and humidity exposure.
• Systems where nickel plated copper conductors are used for enhanced corrosion and mechanical stability.

By adhering to this product standard, aerospace manufacturers ensure high integrity of electrical connections, reducing failure risks and maintenance needs.

Related Standards

• EN 3373-001 – Technical specification for terminal lugs and in-line splices, providing detailed requirements complementary to the product definitions in EN 3373-013.
• EN 2083 – Defines copper or copper alloy conductors for aerospace electrical cables, relevant for conductor compatibility.
• EN 2591-305 – Outlines test methods for rapid temperature changes, applied to validate splice performance.
• MIL-DTL-22520/37 – Specifies crimping tools suitable for wire splicing in aerospace environmental conditions, essential for assembly and installation.
• MIL-STD-202 – Provides standardized testing procedures for electrical component durability, including moisture resistance.
• ASTM B 75 – Standard for seamless copper tube used in crimp barrels enhancing mechanical and electrical reliability.
• QQ-N-290A – Nickel plating specifications critical for corrosion resistance of crimp barrels.

Keywords: aerospace in-line splices, insulated splices, moisture resistant splices, crimping on copper conductors, high-temperature electrical connectors, EN 3373-013 standard, aerospace wiring components, nickel plated copper conductors, electrical splice product standard, crimp barrel design.