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Practical tips 13 May 2024
Using Ferrules

Conductors for which a WAGO installation connector is approved always refer to an untreated conductor, i.e., a conductor that is inserted directly after stripping.

In practice, this results in limitations. For example, not every terminal block is approved for use with fine-stranded conductors. A glance at the data sheets shows that fine-stranded conductors can be connected using ferrules.

There is no blanket statement for using ferrules because some important points must be observed.

  • The length of the ferrule corresponds to the required strip length: If the conductor is too long, the required insulation cannot be provided. If the conductor is too short, a secure connection may not be possible – the strip length is always printed on the connector.
  • The maximum conductor cross-section that can be accommodated is reduced: A ferrule increases the diameter of the conductor. For this reason, it is not possible to accommodate the maximum cross-section of an untreated conductor.
  • The maximum conductor cross-section for insulated and uninsulated ferrules can vary: Insulated ferrules can reduce the maximum cross-section again, as the insulated collar may prevent the conductor from being fully inserted.

  • The conductor should always be inserted in a specific way: The best contact is ensured when the crimp surface is parallel to the contact surface.
  • The conductor should be grasped briefly and inserted using tools if necessary: If the conductor is clamped too long, there is a risk of it buckling above the ferrule and damaging the conductor.
  • A gas-tight crimp part must be selected: The ferrule should be compressed gas-tight with the conductor to ensure a durable, secure connection, e.g., with the WAGO Variocrimp 4 crimping tool (item number 206-1204).