NCV Reviewed Electrical Principles and Practice Level 3 12041003 STD 2023 (Final)

NATIONAL CERTIFICATE (VOCATIONAL)
NQF LEVEL 3
REVIEWED ICASS PRACTICAL

ASSESSMENT
TASK 1
INSTRUCTIONS TO STUDENTS
SUBJECT: ELECTRICAL PRINCIPLES AND PRACTICE

LEVEL 3
SUBJECT CODE: 12041003
DATE OF IMPLEMENTATION: 01 JANUARY 2023
This document consists of 7 pages.
Copyright reserved Please turn over

NC (V) ELECTRICAL PRINCIPLES AND PRACTICE LEVEL 3 2023
This is a practical application task that tests your ability to apply the knowledge and skills acquired
in the vocational subject. The work required from you is an important and compulsory component
of your studies.
1 General information
1.1 Study the task carefully.
1.2 Note the mark and time allocations per subtask and for the task as a whole.
1.3 Note the assessment date(s).
1.4 Study the resources required carefully.
1.5 Use the assessment tool as guidance on how your work will be marked.
1.6 You are required to provide proof that you submitted work done by yourself.
1.7 Research should not be a copy and paste exercise
1.8 Information sources should be correctly referenced.
2 Description of task
Electromagnetism is a fundamental part of the operation of electrical equipment such as
transformers, relays and contactors, motors and generators. In an electrical motor, the
electrical energy is used to generate a magnetic field through induction. This magnetic field
can interact with a second magnetic field and this interaction can cause rotation. This can
very easily be seen and implemented with very simple designs of DC motors.
You are required to research and build a simple DC motor from scratch or build a motor kit.
You will:
 Do research on the internet or in a library to find designs of simple or basic DC motors or
kits that you can build in the workshop or classroom. These designs can be easily found
on the internet, but also in electrical books or magazines.
 Select a design.
 Compile a list of materials and tools required.
 Construct, test and run the motor you have built.
As part of this task you will also be required to run a small commercial DC motor and
observe its behaviour in relation to different voltages and polarity.
3 Instructions for the task
3.1 Subtask 1: Research, construct and test a DC motor
Subtask 1.1: Research (Total 13 marks; Time: Own time )
Research suggestion: If you use the internet for your research, you may type in “simple DC
motor construction” to help you find some designs, or “DC motor kits.”
In your own time:
 Conduct research on the internet, in electrical books, relevant magazines in the library, or
any other available resource to find a variety of designs for simple DC motors.
Note: Focus on simple designs that can be easily built in the workshop, using very basic
materials and are in line with the current level of hand skills you possess.
 Draw or print copies of at least TWO motor designs.
 Place these designs in a folder or staple them together. This is your design portfolio.
 Choose ONE design from the ones in the portfolio that is simple to build with the
Copyright reserved 2 Please turn over

workshop resources available.

 Compile a suitable list of materials that you will need in Worksheet 1.
Note: Worksheet 1 will be given to you during the induction session.
 Compile a list of tools that you will need in Worksheet 1.
Subtask 1.2: Construct a motor (Total 18 marks; Time: ± 100 minutes)
Note: Construction component: You only need to implement ONE of the construction options
given below.
Option 1: Construct and test a motor from scratch
 Complete the safety task instruction (Annexure A) handed to you, before starting your
task.
 Use the college workshop to build the DC motor chosen from your portfolio.
 Compile a step-by-step plan for the construction process of the motor.
Option 2: Construct and test a simple permanent magnet DC motor, using a suitable
kit
 Complete the safety task instruction (Annexure A) handed to you, before starting your
task.
 Find a kit that is easy to construct. A motor with an operating voltage between 5 V and
9 V would be suitable.
 Assemble the motor kit according to the supplier’s specification.
Subtask 1.3: Test the motor (Total 9 marks; Time: ± 20 minutes)
 Select a suitable power supply, adjust it appropriately (4 V-9 V) and connect it to the
motor
OR
 Connect a suitable battery and correct combination of cells (4 V-9 V) to the motor
 When the battery or power supply is connected, the motor should self-start.
 If the motor does not self-start, push the armature by hand to try and start it.
 Sometimes the magnet needs to be repositioned to enable the motor to start.
 Complete and sign the safety task instruction close-out (Annexure B) handed to you
after the task is completed.
3.2 Subtask 2: Observe and record the operation of a commercial DC motor
(Total 10 marks; Time: 30 minutes)
Under supervision:
 Observe the operation of a small commercial DC motor under given circumstances and
record the observations in Worksheet 2, which will be given to you on the day of
assessment.
 Use an adjustable power supply and adjust the voltage to the maximum specified for the
motor being used. If an adjustable power supply is not available, batteries can be used by
connecting them in series to adjust the voltage.
 Connect the motor to the power supply and observe and record the direction of rotation
(clockwise; counter-clockwise) in Worksheet 2. If a tachometer (instrument used for the
measurement of rotational speed) is available, you can use it to make a subjective
observation of the speed of the motor, i.e. fast, medium, slow, etc.
 Slowly reduce the voltage on the power supply, observe and record what is happening to
the speed and direction of the motor in Worksheet 2.
 Observe and record at what voltage setting the motor stopped turning (Worksheet 2).
 Slowly start increasing the voltage on the power supply, observe and record at what
voltage the motor started turning again (Worksheet 2).
 Observe and record what happens if you keep increasing the voltage on the power
supply (Worksheet 2). NB! Be careful not to increase the voltage beyond the maximum
rated voltage of the motor as this can damage the motor.
 Swop the polarity of the power to the motor and observe and record what happens to the
direction and speed of the motor (Worksheet 2).
 Complete the safety task instruction close-out (Annexure B) once you have completed
your tasks.
4 Time and mark allocation

Time Mark Assessment
Subtask Activity
allocation allocation tools
1 Research, construct, and test a DC motor
1.1 Research Own time 13 Checklist
1.2 Construct a motor 18 Checklist
120 minutes
1.3 Test the motor 9 Checklist
2 Observe and record the operation of a commercial DC motor
Decrease voltage 4 Checklist
Increase voltage 30 minutes 4 Checklist
Change polarity 2 Checklist
TOTAL 150 minutes 50
5 Assessment tools
Use the following checklist as guidance on how your work will be marked

STUDENT’S CHECKLIST: PRACTICAL ASSESSMENT TASK 1

SECTION TICK
Task description: Construction and testing of basic DC motors. MARKS LIST
Subtask 1: Research, construct and test a DC motor [40]
Subtask 1.1: Research (13)
1.1 Complete and sign the safety task instruction (Annexure A) before the work starts. 2
1.2 Compile a portfolio with at least TWO designs and select a suitable design to build. 3
1.3 Compile a suitable and complete list of materials. 2
1.4 Compile a suitable and complete list of tools. 2
1.5 Present a step-by-step plan of construction with at least FOUR main steps. 4
Subtask 1.2: Construct a motor - -
Option 1: Build a motor from scratch (18)

1.6 Successfully wind the armature. 2
1.7 Properly form the axle for rotation, and make sure it is straight. 2
1.8 Properly form the commutator on the axle. 2
1.9 Select a suitable base material. 2
1.10 Form the wire supports in a suitable shape to support the armature. 2
1.11 Fasten the wire supports in a successful manner to the base. 2
1.12 Place the armature in a horizontal position and make sure that it can turn freely. 2
1.13 Place the magnet close to the armature without obstructing its motion. 2
1.14 Correctly connect the battery clip to the motor circuit. 2
OR
Option 2: Use a kit assembly to build a motor (18)
1.6 Wind the armature successfully. 2
1.7 Properly install the axle for rotation, and make sure that it is straight as per
2
instructions.
1.8 Properly form the commutator on the axle. 2
1.9 Properly install the supports for the magnets and axle. 2
1.10 Secure all structures to the base. 2
1.11 Properly install the brushes. 2
1.12 Install the armature so it could spin freely. 2
1.13 Position the magnets properly in relation to the armature. 2
1.14 Make the power connections to the appropriate points on the motor. 2

SECTION TICK
Task description MARKS LIST
Subtask 1.3: Test the motor (9)

1.15 Select a suitable power supply, adjust it appropriately (4 V-9 V) and connect it to the
motor.
3
OR
Connect a suitable battery and correct combination of cells (4 V-9 V) to the motor.
1.16 Connect/turn the power on 4
1.17 Complete and sign the safety task instruction close-out (Annexure B) after the task
2
is completed.
Subtask 2: Observe and record DC motor operation [10]
Do the following: - -
Decrease the voltage (4)
2.1 In which direction does the motor turn? 1
2.2 What happens to the motor’s speed? 2
2.3 What is the voltage when the motor stops? 1
Increase the voltage (4)
2.4 What is the voltage at which the motor starts rotating? 1
Change the polarity (2)
TOTAL MARKS 50

RECORD OF PERFORMANCE IN ICASS PRACTICAL ASSESSMENT TASK 1

College
Campus
Student’s surname and first name/s
Student’s ID number
Lecturer’s surname and initials
Date of conclusion of assessment
ASSESSMENT GRID
Mark Student’s Moderator
Subtasks
allocation marks mark
1 Research, construct, and test a DC motor
1.1 Research 13
1.2 Construct a motor 18
1.3 Test the motor 9
2 Observe and record the operation of a commercial DC motor
Decrease voltage 4
Increase voltage 4
Change polarity 2
TOTAL 50
Converted to %
COMPETENCE LEVEL INDICATORS

Not yet
Outstanding Highly competent Competent Not achieved
competent
80-100% 70-79% 50-69% 40-49% 0-39%
5 4 3 2 1
Student’s competence level
Student’s signature
Lecturer’s signature and date
Moderator’s signature and date
Feedback to student
Copyright reserved 7
NQF LEVEL 3
REVIEWED ICASS PRACTICAL

ASSESSMENT
TASK 2

LEVEL 3

of your studies.
It is important for electricians to recognise the basic electrical components as used in
alternating current machines, to know how to test these components and be familiar with
typical values that are found. It is very important to understand the use of various types of
measuring devices and testing instruments.
In this task, you are required to identify the type of motor as well as the various components
that are used within single and three-phase electric motors. You will identify the components
by using various measuring and testing instruments. You will also be required to show how
the motors can be wired in various motor configurations.
Both subtasks are done under supervision in the workshop.
3.1 Subtask 1: Test a single-phase induction motor (Total: 30 marks; Time: 90 minutes)
 Complete the safety task instruction (Annexure A) handed to you before starting your
task.
 Open the connection box on a single-phase motor.
 Set a multimeter to the lowest resistance scale.
 Measure the resistance between the various studs, and record the resistance of the two
coils, and the centrifugal switch (Worksheet 3).
 Switch the multimeter to the appropriate scale to measure the capacitance of the
capacitor. If the motor has two capacitors, record the value of both capacitors (Worksheet
3).
 From the measurements and observations made, identify the following:
o Motor type (capacitor start, capacitor run etc.)
o Starting winding
o Running winding
o Starting capacitor
o Running capacitor (optional)
 Make a neat sketch of the connection block of the motor tested and indicate the positions
of the various components connected to the connection block (Worksheet 3).

 Make a drawing of the internal circuit diagram of the type of motor identified and indicate
the various connecting block studs on the circuit diagram (Worksheet 3).
 Use an insulation resistance tester to determine and record the insulation resistance
between the windings of the motor (Worksheet 3).
o Measure and record the insulation resistance between each component of the motor
and the earth stud. (Worksheet 3)
 Restore the connection block of the motor to its original state and close it by replacing all
nuts, bridge plates and screws.
3.2 Subtask 2: Test a three-phase induction motor (Total: 20 marks; Time: 60 minutes)
 Open the connection box on a three-phase motor.
 Set a multimeter to the correct resistance scale.
 Measure the resistance between the various studs and record the resistance of the coils
of the three-phase motor.
 Use an insulation resistance tester to determine and record the insulation resistance
between the windings of the motor. (Worksheet 4)
o Measure and record the insulation resistance between each component of the motor
and the earth stud. (Worksheet 4)
 Make a neat sketch of the connection block of the motor tested and indicate the positions
of the various components (coils) connected to the connection block (Worksheet 4).
 Make TWO drawings of the connecting block of the motor, indicating how the motor can
be wired in a star or delta configuration (Worksheet 4).
 Restore the connection block of the motor to its original state and close it by replacing all
nuts, bridge plates and screws.
 Complete the safety task instruction close-out (Annexure B) once you have completed
your tasks.

Subtask Activity
1 Test a single-phase induction motor 90 minutes 30 Checklist
2 Test a three-phase induction motor 60 minutes 20 Checklist
5 Assessment tools
Use the following checklist as guidance on how your work will be marked.

STUDENT’S CHECKLIST: PRACTICAL ASSESSMENT TASK 2

Task description SECTION TICK
MARKS LISTS
Testing single and three-phase motors
Subtask 1: Test a single-phase induction motor [30]
1.1 Complete and sign the safety task instruction before you start working 2
1.2 Measurements and identification - -
Measure the following values: (8)
Coil 1 1
Coil 2 1
Centrifugal switch 1
Capacitor 1 1
Capacitor 2 (if fitted) none
Identification of motor 1
Which coil is the starting winding? 1
Which coil is the running winding? 1
Which capacitor is the starting capacitor? 1
Which capacitor is the running capacitor? (Not all single-phase motors will be fitted
none
with two capacitors)
1.3 Insulation resistance tests (10)
Correct testing voltage selected on insulation resistance tester 1
Coil 1 to coil 2 1
Coil 1 to centrifugal switch 1
Coil 1 to capacitor 1
1Coil 2 to centrifugal switch 1
Coil 2 to capacitor 1
Coil 1 to earth 1
Coil 2 to earth 1
Capacitor 1 to earth 1
Capacitor 2 to earth none
Centrifugal switch to earth 1
1.4 Draw the connecting block diagram 4
1.5 Draw the internal circuit diagram of the motor 6

Subtask 2: Test a three-phase induction motor [20]
2.1 Measurements (3)

Coil 1 1
Coil 2 1
2Coil 3 1
Important Note: Values should be as close to equal as possible to ensure motor is
- -
balanced electrically

SECTION TICK
MARKS LISTS
2.2 Insulation resistance tests (7)

Coil 1 to coil 2 1
Coil 1 to coil 3 1
Coil 2 to coil 3 1
Coil 1 to earth 1
Coil 2 to earth 1
Coil 3 to earth 1
Centrifugal switch to earth 1
2.3 Draw the motor terminal block drawing 3
2.4 Draw the motor terminal block wired in STAR 2
2.5 Draw the motor terminal block wired in DELTA 3
2.6 Complete and sign the safety task instruction close-out (Annexure B) after task is
2
completed.
TOTAL MARKS 50

RECORD OF PERFORMANCE IN ICASS PRACTICAL ASSESSMENT TASK 2

College
Campus
ASSESSMENT GRID
Subtasks
1 Test a single-phase induction motor 30
2 Test a three-phase induction motor 20
TOTAL 50
Converted to %

Not yet
competent
80-100% 70-79% 50-69% 40-49% 0-39%

5 4 3 2 1
Feedback to student
NQF LEVEL 3
REVIEWED INTEGRATED SUMMATIVE

ASSESSMENT TASK

LEVEL 3

NC (V) ELECTRICAL PRINCIPLES AND PRACTIC LEVEL 3 2023
of your studies.
In industry, it is required of an electrician to understand a design brief for, as well as wire and
commission, a direct-on-line (DOL) circuit that can be used in various applications, such as:
 Automated pool pumps
 Borehole and water reservoir pumps
 Conveyor systems
You are required to install a three-phase direct-on-line control (DOL) circuit for a 380 V
induction motor.
3.1 Subtask 1: Draw the wiring diagram for the 380 V DOL control and power circuits
 Complete the safety task instruction (Annexure A) handed out, before starting your task.
 Use Worksheet 5 to draw a complete wiring diagram and layout of the installation.
 The wiring diagram must clearly indicate the control and power/main circuit.
 The line connections and motor earth connection must be clearly labelled.
 For a 220 V contactor coil, clearly indicate the neutral connection.
 Correct symbols must be used.
Note: It is of the utmost importance to adhere to instructions.
 The motor must run when the start button is pressed.
 The motor must stop if the stop button is pressed.
 The motor must stop if the ESTOP button is pressed.
 The motor can be connected in star or delta.
 The overload will disconnect the motor in the case of an overload condition.
 An indicator light will show that the motor is running.

3.2 Subtask 2: Build and commission a 380 V DOL starter system

 Build the installation on a wiring panel using the appropriate size panel wire as specified
in the code of practice.
 Test the functionality of the installation.
 Complete the safety task instruction close-out (Annexure B) after completing your task.

Subtask Activity
1 Draw the wiring diagram for the 380 V 30 minutes 25 Checklist
DOL control and power circuits.
2 Build and commission a 380 V DOL 150 minutes 50 Checklist
starter system.
5 Assessment tools
Use the following checklist as guidance on how your work will be marked
STUDENT’S CHECKLIST: INTEGRATED SUMMATIVE ASSESSMENT TASK

Task description SECTION TICK
MARKS LIST
Install, wire and commission a direct-on-line system
Subtask 1: Draw the wiring diagram for the 380 V DOL control and power circuits [25]
1.1 Complete and sign the safety task instruction (Annexure A) before work
2
commenced
1.2 Draw a complete wiring diagram using the correct symbols. - -
Power circuit (9)
 L1 / L2 / L3 indicated correctly 3
 Three-phase circuit breaker 1
 Contactor 1
 Overload relay 1
 Three-phase motor 1
 Earth connection (correct symbol and connection). 2

Control circuit (14)
 Control circuit breaker 1
 ESTOP 1
 Overload relay 1
 Stop push button 1
 Start push button 1
 Holding contacts on contactor 1

SECTION TICK
MARKS LIST
 Contactor coil 1
 Indicator lamp (symbol, label and correct connection) 1
 Neutral connection if 220V contactor is used. (second phase connection if 400V 1

contactor is used)
 Wiring diagram connections are correct, wiring circuit complete and ready for 3
construction
 Complete and sign safety task instruction close-out (Annexure B) after task was 2
completed.
Subtask 2: Build and commission a 380V DOL starter system [50]
2.1 Build a circuit to the following specifications - -
 Neatness of wiring (no pinched wires), including correct conductor sizes and 5
colours
 Terminals not exposed more than 1 mm. 5
 Earthing in accordance with SANS 10142 regulations 5
 Start button functions correctly 5
 Indicator light functions correctly 5
 Stop button functions correctly 5
 Overload functions correctly 5
 Emergency stop functions correctly 5

2.2 Carry out fault finding. The fault should be found within 15 minutes. 5
2.3 Fix the fault and test the operation 5
TOTAL MARKS 75

NC (V) ELECTRICAL PRINCIPLES AND PRACTIC LEVEL 3 2023
RECORD OF PERFORMANCE IN INTEGRATED SUMMATIVE ASSESSMENT TASK

College
Campus
ASSESSMENT GRID
Subtasks
1 Draw the wiring diagram for the 380 V DOL control
25
and power circuits.
2 Build and commission a 380 V DOL starter system 50
TOTAL 75
Converted to %

Not yet
competent
80-100% 70-79% 50-69% 40-49% 0-39%

5 4 3 2 1
Feedback to student

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NATIONAL CERTIFICATE (VOCATIONAL)

REVIEWED ICASS PRACTICAL

SUBJECT: ELECTRICAL PRINCIPLES AND PRACTICE

SUBJECT CODE: 12041003

DATE OF IMPLEMENTATION: 01 JANUARY 2023

This document consists of 7 pages.

Copyright reserved Please turn over

Copyright reserved 2 Please turn over

workshop resources available.

4 Time and mark allocation

Copyright reserved 4 Please turn over

STUDENT’S CHECKLIST: PRACTICAL ASSESSMENT TASK 1

Subtask 1: Research, construct and test a DC motor [40]

Subtask 1.1: Research (13)

Option 1: Build a motor from scratch (18)

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Subtask 1.3: Test the motor (9)

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RECORD OF PERFORMANCE IN ICASS PRACTICAL ASSESSMENT TASK 1

COMPETENCE LEVEL INDICATORS

REVIEWED ICASS PRACTICAL

SUBJECT: ELECTRICAL PRINCIPLES AND PRACTICE

SUBJECT CODE: 12041003

DATE OF IMPLEMENTATION: 01 JANUARY 2023

This document consists of 6 pages.

Copyright reserved Please turn over

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4 Time and mark allocation

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STUDENT’S CHECKLIST: PRACTICAL ASSESSMENT TASK 2

1.5 Draw the internal circuit diagram of the motor 6

2.1 Measurements (3)

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2.2 Insulation resistance tests (7)

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RECORD OF PERFORMANCE IN ICASS PRACTICAL ASSESSMENT TASK 2

COMPETENCE LEVEL INDICATORS

80-100% 70-79% 50-69% 40-49% 0-39%

REVIEWED INTEGRATED SUMMATIVE

SUBJECT: ELECTRICAL PRINCIPLES AND PRACTICE

SUBJECT CODE: 12041003

DATE OF IMPLEMENTATION: 01 JANUARY 2023

This document consists of 5 pages.

Copyright reserved Please turn over

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3.2 Subtask 2: Build and commission a 380 V DOL starter system

4 Time and mark allocation

STUDENT’S CHECKLIST: INTEGRATED SUMMATIVE ASSESSMENT TASK

 Three-phase circuit breaker 1

 Earth connection (correct symbol and connection). 2

 Control circuit breaker 1

 Stop push button 1

 Start push button 1

 Holding contacts on contactor 1

Copyright reserved 3 Please turn over

 Indicator lamp (symbol, label and correct connection) 1

 Neutral connection if 220V contactor is used. (second phase connection if 400V 1

2.1 Build a circuit to the following specifications - -

 Earthing in accordance with SANS 10142 regulations 5