Lecture on wire splicing and termination
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The document outlines wire splicing and termination techniques, detailing the importance of splicing in creating electrical connections from longer wire lengths. It describes various splicing methods, such as the Western Union splice, married joint, and pigtail joint, along with their application in specific scenarios. The lecture emphasizes proper termination practices to prevent short circuits and ensure safe electrical installations.
Lecture on wire splicing and termination
- 1. Lecture on Wire Splicing and Termination Prepared by Amit Kumer Podder Khulna University of Engineering &Technology (KUET)
- 2. Wire Splicing A wire spice is when two pieces of electrical wire are taken and join them together with a crimp, butt-splice, or heat shrink to make a complete electrical connection. Importance of Wire Splicing The Splicing or jointing is required since the wires are manufactured in 100 metres lengths and the total length of wire used for house wiring may be more than 100 metres. The jointing conductors and wires should always be carried out at outlets i.e. in switches,ceiling roses using the looping in system or in junction boxes. Splicing should never be done in conduit runs but sometimes necessary when repairing old works.
- 3. Various Kinds of Splicing Techniques Western Union Splice orTwist Splice Married Joint Single Branch Splice orATap Joint Double Branch Splice Flexible Cord Splicing Pigtail Joint Pigtail Joint of a Solid Conductor and A FlexibleWire
- 4. Western Union Splice orTwist Splice It can be completed in four steps-- 1. Removing Insulation 2. Mechanically jointing the conductors 3. Soldering the joint 4. Tapping the soldered joint
- 6. Mechanically jointing the conductors
- 8. Tapping the soldered joint
- 9. Married joint For a wire having one strand only ,the joint made is called twisted joint, but for wires having a number of strands ,the joint is called as married joint. Spreading of Strands
- 10. Married joint Intersecting of Strands of two wires Twisting of Strands Finishing Joints
- 11. Single Branch Splice orTap joint Sometimes It is necessary to tap the electrical energy from a running line .In that case one free end of the wire is available and thus the twist joint is not possible which necessarily requires two free ends. So in such circumstances aT joint is necessarily made. Removing the insulation
- 12. Single Branch Splice orTap joint Neck turn for makingT-joint Finishing Joints
- 13. Double Branch Splice The double branch splice is used when the electrical energy is required to be sent in two directions at right angles to each other.
- 14. Tap Joint for stranded wires For Stranded wires the single branch or the tap joint is made below---
- 15. Flexible Cord Splicing Sometimes it is necessary to provide a joint in a twin core cord. In such cases the two joints of the cores must be staggered as presented below--
- 16. Pigtail Joint The Pigtail joint is the most important joint, since it is often required of termination of the wires in switches, holders etc as presented below–
- 17. Pigtail Joint of a Solid Conductor and a flexible wire Such a joint is made in a manner similar to that of an ordinary pigtail joint ,except that after wrapping the stranded wire round the solid conductor for a length of 2.5 cm as presented below–
- 18. Termination of theWire While making termination ,the insulation of the wire is brought near the screw ,it is wrong method to keep it away as presented below as such a termination causes a short circuit–