PRACTICAL GUIDE FOR ELECTRICAL WORKSHOP PRACTICE II

(EEC 129)

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COMPILED
BY

ODUBONA
ISMAIL

 

 

ELECTRICAL
ELECTRONICS DEPARTMENT

YABA
COLLEGE OF TECHNOLOGY

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTENTS

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

Aims:
At the end of the exercise students should be able to understand different
methods of joining electrical cables and their applications

 

Materials

8mm2 service cable

Tools

Cutting plier

Scraping knife

Nose plier

 

Type1
1: Y-splice joint

Application:
This
method of wrapping is generally used on small cables because the strands are
flexible and all can be wrapped in one operation

 

Diagram

 

 

Step 1:

 

Step 2:

 

Type 2: Knotted
tap.

Application:
This
is used where the tap wire is under heavy tensile stress.

 

Diagram

Step 1

 

 

 

Type 3: Plain
tap joint.

Application:
This
is used where the tap wire is under considerable tensile stress circuit.

 

Diagram

Step
1

 

Type4:
Duplex cross joint.

Application:
This
is a two-tap wire turned simultaneously and is used where the two tap wire is
under heavy tensile stress

 

Diagram

Step 1

 

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.

Diagram

 

Step
1

 

 

Type
6: Cross joint.

Application:
The
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.

 

Diagram

 

Step
1:

 

 

 

 

 

WORKSHOP PRACTICE 02;

WIRING 
TECHNIQUES

Aim: At the end of the exercise, students should be
able to:

1.                 
Install a Single light point controlled by a one-way switch

2.                 
Install Two light points controlled by a one-way switch

3.                 
Install Two light points controlled separately by two one-way
switches

4.                
Install a ring circuit

5.                
Install an Earth Leakage Circuit Breaker
(ELCB.)

 

1.                
Materials/Items

1.                
5A 1-gang, 1-way switch

Earth
Leakage Circuit Breaker

13A
Switch socket outlet x4 (pattress)

Ceiling
rose x 4

Joint
box x 5

¾
screws 5 packets

Bulked
clips 20 packets

13A
plugs x 5

Cables
1.5 mm2 x 2 PVC         , 2.5mm2
x 3 PVC, 0.5mm2 x 2 (flexible cord)

                                                         

2.3     Diagrams

 

(i)                
Single
light point controlled by a one-way switch

N

L

S

LAMP

 

 

 

 

 

 

(ii)              
Two
light points controlled by a one-way switch

N

L

S

LAMP 1

LAMP 2

 

 

 

 

 

 

(iii)            
Two
light points controlled separately by two one-way switches

N

L

LAMP 1

LAMP 2

S1

S2

 

 

 

 

 

 

 

2.4     Description/Operation

2.5     Precaution

2.6     Conclusion

 

 

 

 

EXPERIMENT 03:

3.0    Title: power Distribution

3.1     Aim:

At
the end of the exercise, students should be able to distribute power in a consumer
premises employing;

1.                
Single phase

2.                
Three-phase four-wire systems.

3.2    Material/Items

i.        Consumer
Control Unit:          I-Phase

3-Phase

ii.       1.5
mm2 x 2 co res PVC

iii.      2.5mm2
x 3 cores PVC

iv       4.0mm2
x 3 cores PVC

v.      6.0mm2 x 3 cores PVC

 

3.3     Descriptions/Diagram (attached)

3.4     Precaution

3.5    Conclusion

 

EXPERIMENT 04:

4.0
    Title: Testing of Electrical
Installation

 

4.1     Aim:

At the end of the exercise, students should be able
to carry out:

1.                
Verification of polarity;

2.                
Insulation test;

3.                
Earthing test

4.                
Test of Ring Circuit Continuity

 

4.2     Materials/items/Equipment

i.        Test board

ii        Ohmmeter

iii.      Megger

iv.      Indicator tester (Neon Tester)

 

4.3    Diagrams
(attached)

 

4.4     Description

 

4.5    Precaution

 

4.6    Conclusion

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXPERIMENT
05:

5.0    Title: Electrical Soldering

5.1     Aim: At the end of the exercise, the students
should be able to carry out;

i.        Soldering
bit method

ii.       Stick
“Method

iii.      Pot
and Laddie Method. (Metal)

 

5.2    Materials/Equipment

i.        Pliers

ii.       Sharp knife

iii.      Soldering bit

iv.      Flux

v.       Blow lamp

vi.      Solder

vii.     Rubber Tape

viii.    Cambric tape (empire tape    ix. Black Insulating tape.

 

5.3     Description

5.3.1  Soldering bit method

i.        Smear
joint with resinous flux

ii.       Apply
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)

i.        Heat
solder pot until the solder is running freely.

ii.
      When the solder as reached working
temperature, transfer from the pot with a ladle.

iii.      As
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,

5.4
    Precaution

 

5.5     Conclusion

 

 

 

 

 

 

 

 

EXPER1MENT 06:

 

6.0     Title:
Electric Motor Installation

 

6.1
    Aim: At the end of the
exercise, students should be able to wire Electric motors using:

i.        Direct-On-Line
Starter

ii.       Auto
Transformer Starter

iii.      Resistance
Starter

iv.      Star-Delta
Starter

 

6.2     Material/Items

i.        Contractors

ii.       Isolator

Hi.     Delay
on-timer/delay off-timer

iv.      Over
load relay

v.       Limiting
switch

vi.      Current
transformer, V,

vii.     Ammeter,
voltmeter, frequency meter

viii.
   Start/Stop button

ix       Pilot
lamps (red, green, amber)

 

6.3     Diagrams
(attached)

 

6.4     Description
(operation)

 

6.5     Precaution

 

6.6
    Conclusion

 

 

 

x

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