How to Crimp Compression Joints?

General Information

Compression connections require precise matching of joint, conductor and tool size. Conductor, selected compression joint and compression die provides best results:
A durable, heavy duty connection.
The hexagon compression is designed for a conductor temperature up to 90°C, acc. to IEC.


All compression joints are stamped with cross section specification, manufacturer’s logo as well as die code number, corresponding roughly to the outer diameter of the sleeve. Select the compression tool die corresponding to this code. The hexagon compressions are carried out by means of mechanical or hydraulic tools.
“Cu” marked dies have to be used for copper or steel joints. Designated “Al” dies are used for aluminum or aluminum alloy joints.
In the case of hydraulic tools differentiation regarding the conductor materials is not necessary.

Assembly instruction:

1. Strip conductor to sleeve length +10%

2. Remove all tapes/yarn/powder or similar conductor filling materials before mounting

3. Erase dirt and oxide layers from both conductors using a metal brush

4. Insert conductor into compression sleeve up to the stop or inspection hole

5. Before compression verify the die code with the compression mark number on the joint

6. Start compression from the middle to the barrel end

7. The number and position of the compression points is indicated by marking Attention: All markings must be compressed

8. Insert second conductor into compression sleeve up to the stop or inspection hole

9. Start compression on second side from the middle to the barrel end

10. Final Check: The extension length of the joint is about 10 % by proper compression with correct conductor – joint – die – combination

11. Remove excess grease

Please note:
During installation of special connectors, such as notch type midspan joints and connectors with steel sleeve, you have to adhere specific installation requirements.