PRACTICAL GUIDE FOR ELECTRICAL WORKSHOP PRACTICE II
COLLEGE OF TECHNOLOGY
WORKSHOP PRACTICE 01: CABLE JOINTS
WORKSHOP PRACTICE 02: WIRING TECHNIQUES
WORKSHOP PRACTICE 03: POWER DISTRIBUTION
WORKSHOP PRACTICE 04: TESTING OF ELECTRICAL INSTALLATION
WORKSHOP PRACTICE 05: ELECTRICAL SOLDERING
WORKSHOP PRACTICE 06:
ELECTRIC MOTOR INSTALLATION
WORKSHOP PRACTICE 01:
TITLE: CABLE JOINTS
At the end of the exercise students should be able to understand different
methods of joining electrical cables and their applications
8mm2 service cable
1: Y-splice joint
method of wrapping is generally used on small cables because the strands are
flexible and all can be wrapped in one operation
Type 2: Knotted
is used where the tap wire is under heavy tensile stress.
Type 3: Plain
is used where the tap wire is under considerable tensile stress circuit.
Duplex cross joint.
is a two-tap wire turned simultaneously and is used where the two tap wire is
under heavy tensile stress
Type 5: Western
Union Short-tie Splice.
Application: This is the most
widely used splice or joint in interior wiring installation to extend the length
of wire from one point to another.
6: Cross joint.
same application is done as in plain tap and the only difference is that this
tap is a combination of two plain taps place side by side with each other.
WORKSHOP PRACTICE 02;
Aim: At the end of the exercise, students should be
Install a Single light point controlled by a one-way switch
Install Two light points controlled by a one-way switch
Install Two light points controlled separately by two one-way
Install a ring circuit
Install an Earth Leakage Circuit Breaker
5A 1-gang, 1-way switch
Leakage Circuit Breaker
Switch socket outlet x4 (pattress)
rose x 4
box x 5
screws 5 packets
clips 20 packets
plugs x 5
1.5 mm2 x 2 PVC , 2.5mm2
x 3 PVC, 0.5mm2 x 2 (flexible cord)
light point controlled by a one-way switch
light points controlled by a one-way switch
light points controlled separately by two one-way switches
3.0 Title: power Distribution
the end of the exercise, students should be able to distribute power in a consumer
Three-phase four-wire systems.
Control Unit: I-Phase
mm2 x 2 co res PVC
x 3 cores PVC
x 3 cores PVC
v. 6.0mm2 x 3 cores PVC
3.3 Descriptions/Diagram (attached)
Title: Testing of Electrical
At the end of the exercise, students should be able
to carry out:
Verification of polarity;
Test of Ring Circuit Continuity
i. Test board
iv. Indicator tester (Neon Tester)
5.0 Title: Electrical Soldering
5.1 Aim: At the end of the exercise, the students
should be able to carry out;
and Laddie Method. (Metal)
ii. Sharp knife
iii. Soldering bit
v. Blow lamp
vii. Rubber Tape
viii. Cambric tape (empire tape ix. Black Insulating tape.
5.3.1 Soldering bit method
joint with resinous flux
tinned bit under the joint the heat penetrates it.
iii Apply stick of solder to the joint until the
solder flows freely through it
5.32 Stick method
i. Heat joint with a b low Iamp
ii. Apply flux to the joint
iii. Apply stick of solder to the joint until the
solder Hows freely through it.
5.3.3 Pot and
laddle method (heavy duty)
solder pot until the solder is running freely.
When the solder as reached working
temperature, transfer from the pot with a ladle.
the solder is being pour over the prepared joint, it is caught by another ladle
placed under the joint.
iv. This action is repeated until the solder
penetrates the joint,
Electric Motor Installation
Aim: At the end of the
exercise, students should be able to wire Electric motors using:
voltmeter, frequency meter
lamps (red, green, amber)