The document discusses cable jointing and different types of cable joints. It explains that cable joints connect low, medium, or high voltage cables and must match the cable's voltage, structure, insulation, and number of cores. The main types of joints discussed are straight through joints, branch joints like T-joints and Y-joints, pot end joints, and indoor/outdoor terminations. Straight through joints provide quick preparation and installation while maintaining electrical and mechanical integrity. Branch joints are used to connect a service cable from a main cable. Pot end joints seal each cable core separately and provide termination for live power cables.

1. Unit 4, part 2/3 of cables
JOINTING OF CABLES
PRESENTED BY
MOHSIN MULLA
ASST. PROF, DEPT OF EE.

2. • The electrical cable termination
is the physical and electrical
connection of a cable end that
connects to another cable, or to
the terminal of the equipment.
• The cable terminations are
often designed to enable the
p h y s i c a l a n d e l e c t r i c a l
interconnecting of two cable
ends, or a cable end and a
terminal on the equipment.

4. • The cable joints are used to connect low, medium or high voltage cables. The type of cable joint
sizes and shapes vary according to the voltage, structure, insulation and the number of cores of
the cable to be jointed.
Voltage:
• The joints are designed for low, medium or high voltages and it is important to match the capacity
of the joint to that of the cable otherwise a low power cable joint will fail if subjected to high
current.
Structure:
• The cable joints are made according to how the cables are to be connected. The simple joints such
as the straight through connectors are used to connect two power cables at one point while the
other more advanced branch connectors may be used to accommodate a cable branching off the
main line or several cables coming into one joint to form one main cable.

5. Cont...
Cores:
• The cable joints are required to have the same number of cores to those of the cables to
be joined.
Insulation:
• There are different cable insulations depending on the application of the cable and the
cable joint must be compatible with the cable insulation.
• To maintain insulation of the jointed cables, there are a variety of insulation procedures,
and can be either heat or cold shrinkable insulation, r molded type of insulation, or use
of tape.

6. • There are about four commonly used types of joints;
• Straight through joints
• Branch which can be a T or Y joint
• Pot ends
• Indoor/Outdoor terminations

7. Straight Through joints
• This is the mostly used type of a joint and is used to extend pieces of
electrical cables. A typical joint is as shown in figure.
1. Raiser 2. Earth continuity connection 3. C J Compound 4. Plastinate 5. Pouring gate
6. Core insulation 7. PVC tape 8. Ferrule 9.BOPP Tape two layers each half overlapped over plastinet

9. Advantages of Straight through joint
Straight through Joints provide
• quick cable preparation
• high electrical insulation
• no moisture ingress.
• good mechanical strength
• compact dimensions
• suitable for all conductor, shape and
material
• Straight through Joints are made by metal
joining processes, such as welding and
soldering

10. T-Joint or Y-joint
• These types are used for jointing
of a service cable from a main
cable. T-joints are helpful as
turning and twisting of cable
damages its outer core

12. Pot End Joints
• The pot end joints are used at the live voltage cable ends. In a typical
cable, each of the cores is sealed separately using a heat shrink cable end
caps. A screen bandage is then applied to provide for earth fault
protection and the combination is then covered with a thick wall of heat
shrink cable cap.
• The pot ends joints are suitable for temporary and permanent cable
abandonment to provide safe termination of live power cables for indoor,
outdoor as well as underground cables.

15. video link: https://youtu.be/9ZpvhRqe748