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Ferrules

Different ferrules for different conductor cross sections

The ferrule is a useful tool in conductor assembly and wiring. Using sleeves prevents potential splicing of the individual litz wires, thereby enabling effective and, above all, reliable further processing.

In DIN 46228, the ferrule is defined as being between 0.5 and 50 mm². This standard is divided into four parts:

  • Part 1: Tubular end-sleeves without plastic sleeve
  • Part 2: Crimp-type end-splices, with and without insulation grip
  • Part 3: Conductor-embracing end-splices, without insulation grip
  • Part 4: Tubular end-sleeves with plastic sleeve

In addition to the geometric dimensions, the standard also sets out the material, the coloring according to the cross section, and the test specifications. Furthermore, the sleeve must fit class 2, 5, and 6 conductors. The conductor cross sections are defined using the electrical resistance values and not, as is the case for sleeves, using the geometric dimensions. Greater variations in the cross sections are therefore possible (also refer to the section on conductors and cables). Due to this, there is a certain discrepancy between the sleeve and the conductor. However, Phoenix Contact crimping tools are largely designed to compensate for this difference in capacity.

In addition to DIN, there is a French standard for ferrules, NF C 63-023. With the exception of the coloring for some cross sections (see matrix), the NF standard is based on the DIN standard. UL 486 F as well as Canadian standard C22.2 NO. 291-14 are new additions to the normative framework for ferrules. These harmonized standards are also based on the DIN standard. However, they deal more with test methods and specific requirements (for example, see table for pull-out values).

In UL 486 F, special sleeves such as “TWIN” for two-conductor connection are also recorded for the first time in the standard. For certification in accordance with the aforementioned UL and CSA standards, comprehensive testing must be carried out the respective organization. It is not just the sleeves that are tested and certified, but the entire system comprising crimping tools and ferrules.

The most important advantages of ferrules:

  • Increased, long-term operational and contact reliability
  • Time-saving further processing (particularly in the case of Push-in terminal blocks)
  • Reliable connection, even with repeated re-wiring
  • Reduction in cable breakages
  • Easy cross section detection
  • Increased vibration resistance
  • Permanently low contact resistance
  • Individual litz wires are protected (particularly in the case of screw terminal blocks)
  • Consistent clamping in the case of screw connections

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