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close this bookHandling and Connection of Cables and Lines for Fixed Laying - Course: Basic skills and knowledge of electrical engineering. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 17 p.)
close this folder3. Connection of Cables and Lines for Fixed Laying to Electrical Equipment
View the document(introduction...)
View the document3.1. Making Screw Joints
View the document3.2. Criteria for Clamped Joints in Electrical Installations
View the document3.3. Pressed Joints
View the document3.4. Making Wire-wrap Joints
View the document3.5. Making Soldered Joints

3.3. Pressed Joints

Criteria for connections by means of press-sleeves

- Hand pressing plier required.

Figure 20 Pressing plier

1 grips with pawl bolt, 2 setscrew for mechanical end stop

- Applicable for Al and AlCu conductors only.

- Applicable only for three or four conductors with a cross section of 2.5 mm2. (If two conductors are to be connected only, a third or fourth conductor is to be pressed in as filler).

- Shorter assembly time.

- Clamping inserts are not required.

- Longer lasting contact than that of other types of joints.

Sequence of operations

- Conductor length to permit three times re-adjustment. (150 mm are sufficient)

- Strip conductor ends and remove any oxide or other contamination layers.

Figure 21 Branch box prepared for pressing

- Slip press-sleeve over stripped conductor ends with rotary motion. Make sure that all conductor ends contact the bottom of the sleeve!

- Distance between sleeve opening and beginning of conductor insulation should not be more than 3 mm!

- Apply pressing plier at front and compress up to stop.

- Slip insulation sleeve onto pressed sleeve until conical end of insulation sleeve closely fits on press-sleeve.

Figure 22 Finished pressed-joint

1 press-sleeve, 2 insulation sleeve, 3 distance sleeve opening to conductor insulation

Figure 23 Pressed joint in a branch box/conduit box, made and insulated

What are the advantages of pressed joints over clamped joints?