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close this bookMaking Permanent Joints - Course: Basic skills and knowledge of electrical engineering. Trainees' handbook of lessons (Institut fr Berufliche Entwicklung, 19 p.)
View the document(introduction...)
View the documentIntroduction
View the document1. Types and Meaning of Permanent Joints
View the document2. Tools for Making Permanent Electrical Joints (Bondings)
Open this folder and view contents3. Soldered Joints
View the document4. Wire-wrap Joints
View the document5. Notched Joints
View the document6. Pressed Joints

6. Pressed Joints

Pressed joints are a way of connecting cable eyes with a multiple-wire or flexible conductor. The cable eyes are selected so as to suit the cross section and material of the conductor. Conductor and cable eye must be of the same material. The joint is made be means of a pressing tool.

What cross-sections of copper or aluminium conductors can be pressed?

Steps of work

· Cutting to length and stripping of the conductor
· Cleaning of the conductor

· Feeding the conductor into the cable eye or the conductors into the sleeve

The press-sleeve must be used only for aluminium conductors of 2.5 mm2 cross-section.

Three conductors must always be fed into the press-sleeve.

If only two conductors are to be joined, third conductor is to be used as filler.

· Making the pressed joint

The cable eye or the sleeve is to be put into the respective tool with existing marks for fixing the position to be considered. In correct position the pressing process can be performed.

Figure 18 - Marked and fixed cable eye connections

After the pressing process the cable eye or sleeve is to be removed from the pressing tool. The flash produced at the cable eye is to be removed by a side cutting plier or by a file. The insulating sleeve is to be slipped over the press-sleeve until the conical end sticks on the press-sleeve. The pressing tools are to be cleaned after use.

Why must the flash at the cable eye be removed after pressing?

Figure 19 - Sleeve or passed joint - 1 press-sleeve, 2 insulating sleeve, 3 conductors to be connected

· Inspection of the pressed joint

Check gauges are used for checking the proper execution of the pressing

What steps are required for making the various types of joints?

soldered joint

wire-wrap joint

notched joint

pressed joint