Ferrules - Complete Selection Guide

Ferrules – Complete Selection Guide

Ferrules improve electrical safety, reliability, and connection quality when terminating flexible conductors. This guide explains ferrule types, sizing, selection criteria, and trusted brands supplied by Cablectrix.

1. What Are Ferrules?

Ferrules are metal sleeves fitted over stranded conductors before termination. They prevent strand splaying, ensure even clamping pressure, and improve long-term electrical reliability.

2. Types of Ferrules
  • Insulated Ferrules: Most common, colour-coded for size
  • Uninsulated Ferrules: Used where space is limited
  • Twin Ferrules: Terminate two conductors into one terminal
  • Bootlace Ferrules: Designed for fine-stranded wire
3. Ferrule Colour Coding & Sizing

Ferrules are colour-coded to match conductor cross-section (mm²). Correct sizing is critical — undersized ferrules damage strands, oversized ferrules reduce contact quality.

4. What to Consider When Selecting Ferrules
  • Conductor size and strand count
  • Terminal type and clamping method
  • Environmental conditions (vibration, temperature)
  • Compliance with wiring standards
5. Ferrule Tools & Crimp Quality

Use a ferrule-specific crimping tool with square or hex profiles. Proper tooling ensures gas-tight crimps and prevents pull-out or overheating.

6. Ferrule Brands Available from Cablectrix

Cablectrix supplies high-quality ferrules from trusted manufacturers, including Klauke and other recognised industrial brands, ensuring consistency, compliance, and long service life.

7. Best Practice Tips

Always strip to the correct length, insert fully into the ferrule, and crimp once only. Avoid twisting conductors before insertion.

Ferrules - Complete Selection Guide