ASSESSMENT TOOL

PERFORM TESTING OF
Unit(s) of ELECTRICAL Unit Code: ENG/OS/EI//CR/03/5
competency: INSTALLATION

Qualification: ELECTRICAL INSTALLATION OPERATOR (KNQF LEVEL 5)

Qualification Code:

CANDIDATE INSTRUCTIONS

This assessment requires you to demonstrate competence against unit of competency: Perform
Testing of Electrical Installation
In this assessment, you will be required to answer written questions and carry out practical tasks.

WRITTEN ASSESSMENT
Instructions:

i. You are allocated Two (2) hours to attempt all the questions.
ii. This assessment has three sections (A, B and C)
iii. You are provided with a separate answer booklet.
iv. Do not write on the question paper
v. Marks for each question are indicated in the brackets [ ]

SECTION A: MULTIPLE CHOICE QUESTIONS (20 Marks) Instructions

to the candidate
In this section, you are required to indicate your response by writing the letter you have chosen
from one of the four choices listed in the answer sheets provided.

1. Which documents makes an electrical installation certificate valid? [2 marks]

A. Schedule of test results and schedule of inspection.
B. Verification of installation document
C. Maintenance procedures
D. Certificate of completion
2. Which of the following instruments is used to measure the insulation resistance of a circuit?
[1 mark]
A. Multimeter
B. Ammeter
C. Voltmeter
D. Megger

2
3. Which one of the following is not a protective device? [1 mark]
A. Fuse
B. Circuit breaker
C. Residual current tester
D. Supply cut out (main switch)
4. Which of the following is the correct definition of a ring final circuit? [2 marks]
A. A circuit that opposes the flow of current
B. A circuit which the conductor forms a loop starting at the supply point and returning to the
same point
C. A circuit whose supply is connected to the installation
D. A circuit which provides to intake point of a supply
5. Why do we carry a polarity tester? [3 marks]
A. To ensure that the conductors are connected into the correct terminal.
B. To ensure that the conductors form a complete loop.
C. To ensure that circuit protective conductors of a radial circuit are intact.
D. To ensure that protective bonding conductors are unbroken.
6. For a circuit to have good insulation which value of the reading is appropriate? [2 marks]
A. Below one (1) mega ohms
B. Below two (2) mega ohms
C. Above two (2) mega ohms
D. Two (2) mega ohms
7. Which of the following is the first step of isolating a circuit from the main supply before
carrying out any test? [2 marks]
A. Testing between conductors and earth
B. Ensure the circuit is live and that the voltage indicator is working
C. Locate the point of isolation
D. Testing the circuit to prove that you have isolated the correct circuit
8. One of the following is not a factor during visual inspection. What is it? [2 marks]
A. Safety
B. Corrosion
C. Wear and tear
D. Time of installation
9. In carrying out periodic inspection and testing the following documents are required. Which is
not? [2 marks]
A. An electrical installation condition report
B. A condition report inspection schedule
C. A new installation report
D. A schedule of test results
10. Select the appropriate list of instruments that are used in carrying out tests on completed
installations. [3 marks]
A. Wire strippers, ammeters, side cutters and pliers
B. Insulation resistance tester, multimeter, ohmmeter and clamp meter
C. Cutter, multimeter, ohmmeter and clamp meter
D. Megger, rotary hammer, pliers and ammeter.

TVET CDACC ASSESSMENT TOOLS Page 1

3
 SECTION B: SHORT ANSWER QUESTIONS (30 MARKS)

Instructions:

In this section, you are required to provide short responses in the answer sheets provided.

1. As an electrician which types of joints are you likely to make while at work? [3 marks]
2. Accidents occur in electrical workshops what might be the possible causes of this? [5marks]
3. What is meant by a switch gear in as applied electrical installation [3 marks]
4. What are some of the I.E.E regulations regarding cable joints and terminations? [5 marks]
5. In your own view why should one take into account safety precautions before testing an
electrical installation? [6 marks]
6. What are the essential requirements of a switch gear? [6 marks]
7. Testing and visual inspection is always done on various electrical installation works. Which
areas are recommended for doing these? [2 marks]

SECTION C: EXTENDED RESPONSE QUESTIONS (50 MARKS)

Instructions:
In this section, you are required to answer the questions in the answer booklet provided.

1. Testing and inspection are terminologies applied electrical installation. What is the main
difference between the two? [4 marks]
2. As an electrician a Megger is one of the instrument you are expected to work with. How
can it be used to determine effectiveness of insulation? [8marks]
3. As an electrician after you are done carrying out a machine installation which tests a you
going to carry out the completed electrical installation before finally powering it? [18 marks]
4. While working in a packaging section of a sugar factory, a colleague of yours has already
installed a motor as per the schematic diagram shown in Figure Q below. What are some of
the visual inspection are you likely to carry out before performing necessary tests? (Make a
table of what to look for in your checklist) [20 marks]

4
Figure Q

5
 PRACTICAL ASSESSMENT

Instructions:
In this assessment, you are required to complete the following tasks using with reference to figure G
below

Figure G
a) You have 5 minutes to view the installed diagram to be tested.
b) You have 10 minutes to assemble all the required tools and equipment for carrying out:
 Continuity test
 Short circuit test
 Insulation resistance tests
 Polarity test
 Earth fault loop impedance test
6
 c) You have 10 minutes to verify all the installed fittings.
d) You have one (1) hour and 30 minutes to carry out the above tests when the circuit is dead and
record results.
e) You have 20 minutes to compare the test results and permissible data.
f) You have 15 minutes to compile the test report.
g) Video recording and photoshoots will be done as you carry out the practical assessment.

You are provided with the following resources for the tasks:
Tools/
Equipment: Materials:
 Combination Answer booklet
pliers to record the
 Long nose pliers practical test
 Phase tester results
 Star Screw driver
 Flat screw driver
 Digital
multimeter
 Analog
multimeter
 Megger
 Protective hand
gloves

ASSESSOR INSTRUCTIONS

This assessment requires the candidate to demonstrate competence against unit of competency:
Perform Testing On Electrical Installations.
In this assessment, the candidate will be required to answer written questions and perform practical
tasks.
a) Allocate 5 minutes for the candidate to view the installed diagram to be tested.
b) Allocate 10 minutes for the candidate to assemble all the required tools and equipment for
carrying out the following tests:
 Continuity test
 Short circuit test
 Insulation resistance tests
 Polarity test
 Earth fault loop impedance test
7
 c) Allocate 10 minutes to verify all the installed fittings.
d) Allocate one (1) hour and 30 minutes for the candidate to carry out the above tests when the
circuit is dead and record results.
e) Allocate 20 minutes for the candidate to compare the test results and permissible data.
f) Allocate 15 minutes for the candidate to compile the test report.
g) Video record and take photos as the candidate carry’s out activities in the practical assessment.

Provide the candidate with the following resources for the tasks:
Tools/
Equipment: Materials:
 Combination Answer booklet
pliers to record the
 Long nose pliers practical test
 Phase tester results
 Star Screw driver
 Flat screw driver
 Digital
multimeter
 Analog
multimeter
 Megger
 Protective hand
gloves

SECTION A: MULTIPLE CHOICE QUESTIONS ASSESSMENT (20 MARKS)

MULTIPLE CHOICE QUESTIONS AND APPROPRIATE ANSWERS

Task: Assessor to gauge understanding of the candidate by asking the oral questions
Question Response Max. Marks
1. Which documents makes an electrical (A). Schedule of test results and schedule of 2
installation certificate valid? inspection.

2. Which of the following instruments is (D.) Megger 1

used to measure the insulation •
resistance of a circuit?
3. Which one of the following is not a (C.) Residual current tester 1
protective device? [1 mark]

ORAL ASSESSMENT QUESTIONS AND MODEL ANSWERS

Task: Assessor to gauge understanding of the candidate by asking the oral questions

8
Question Response Max. Marks

4. Which of the following is the correct (B). A circuit which the conductor forms a 2
definition of a ring final circuit? loop starting at the supply point and
returning to the same point

5. Why do we carry out a polarity tester? (A). To ensure that the conductors are 3
connected into the correct terminal.

6. For a circuit to have good insulation (C). Above two (2) mega ohms 2
which value of the reading is
appropriate?
7. Which of the following is the first (B.) Ensure the circuit is live and that the 2
step of isolating a circuit from the voltage indicator is working
main supply before carrying out any
test?

8. One of the following is not a factor (D). Time of installation 2

during visual inspection. What is it?

9. In carrying out periodic inspection (C). A new installation report 2

and testing the following documents
are required. Which is not?

10. Select the appropriate list of (B). Insulation resistance tester, multimeter, 3
instruments that are used in carrying ohmmeter and clamp meter
out tests on completed installations.

Total Marks 20

SECTION A: MULTIPLE CHOICE ASSESSMENT

MARKS SHEET
Candidate’s name & Registration No.

Assessor’s name & Reg. code

Unit(s) of Competency

Venue of Assessment

Date of assessment:

Marks Marks
Question
Available Obtained
Question 1 2
Question 2 1
Question 3 1

9
 Question 4 2
Question 5 3
Question 6 2
Question 7 2
Question 8 2
Question 9 2
Question 10 3
TOTAL: 20 (100%) `
The candidate was found to be: Competent Not yet competent

(The candidate is competent if s/he gets 50% or )

higher

Comments by Assessor:

SECTION B: SHORT ANSWER QUESTIONS (30 MARKS)

MODEL ANSWERS FOR THE SHORT ANSWERS QUESTIONS Note to Assessor:

These are suggested answers to act as guidelines

1. As an electrician which types of joints are you likely to make while at work? [3 marks]
 T-joint
 Married joint
 Scarf-Joint
2. Accidents occur in electrical workshops what might be the possible causes of this?
[5marks]
 Carelessness
 Overconfidence
 Failure to adhere to workshop procedures
 Skylarking in the workshops
 Ignorance
 Poor lighting

3. What is meant by a switch gear in as applied electrical installation [3 marks]

 It is an electrical equipment capable of providing protection, isolation and earthing
terminals.

10
 4. What are some of the I.E.E regulations regarding cable joints and terminations?[5
marks]
 It has to be Electrically sound
 Mechanically sound
 Should be accessible
 Should be provided with an insulation with strength equivalent to original insulating material
 Should be made from the same conductor materials (any four)

5. In your own view why should one take into account safety precautions before testing an
electrical installation? [6 marks]
 This helps to avoid injury to testing personnel
 This helps to avoid damage to equipment and property
 This helps to ensure un authorised persons are kept away from danger

6. What are the essential requirements of a switch gear? [6 marks]

 Means of Isolation
The function is to ensure that power can be switched on and off at the intake point.
 Means of Earthing
This can be provided as a means of protection for the circuit
 Means of Protection
Achieved either by use of fuse or circuit breaker for the purpose of the circuit for over current or
faults.

7. Testing and visual inspection is always done on various electrical installation works.
Which areas are recommended for doing these? [2
marks]
 On newly completed installations before powering them from the supply intake point.
 After completing repair and maintenance work on existing installations
 After carrying out an extension of wiring from one building to another.

SECTION B: SHORT ANSWER QUESTIONS MARK SHEET

Candidate’s name & Registration No.
Assessor’s name & Reg. code

Unit(s) of Competency

Venue of Assessment

Date of assessment:

Question Marks Marks

Available Obtained

Question 1 3
Question 2 5

11
Question 3 3
Question 4 5
Question 5 6
Question 6 6
Question 7 2
TOTAL: 30 (100%) `

The candidate was found to be: Competent Not yet competent

(The candidate is competent if s/he gets 50% or )
higher
Comments by Assessor:

SECTION C: EXTENDED RESPONSE QUESTIONS (50 MARKS)

MODEL ANSWERS FOR THE EXTENDED RESPONSE QUESTIONS

Note to Assessor: These are suggested answers to act as guidelines

1. Testing and inspection are terminologies applied electrical installation. What is the
main difference between the two? [4 marks]
 Testing refers to the use of instruments so that readings are obtained and can be compared to
those provided in the data sheets while inspection refers to the use of physical inspection of
the connected conductors to the various accessories which must remain electrically and
mechanically sound and that the red conductors and black conductors have been correctly
connected to the right poles.

2. As an electrician Megger is one of the instruments you are expected to work with.
How can it be used to determine effectiveness of insulation? [8marks]
i. Switch off the supply of the circuits you are testing
ii. Prepare a table in which you can record the insulation values that result
from the tests
iii. Select 500V D.C or 1000V DC as test voltage depending on the model
12
 iv. Place positive and negative probes of megger on two conductors or
terminals between which you are testing the insulation resistance
v. Energize the megger for 1 minute
vi. Read the value of resistance at the end of minute test and note it in the
table.
vii. Continue testing until you have values for all spaces of the table.
viii. Examine resistance values entered and the allowable values i.e be over 25Mega ohms.

3. As an electrician after you are done carrying out a machine installation which tests a
you going to carry out the completed electrical installation before finally powering it?
[18 marks]
 Continuity test
It is carried out using a multimeter and ensures that the circuit is complete and allows flow
current from one place to another
 Short circuit test
It is carried out to ensure that phases are not in contact with each other and a multimeter is the
instrument used here.
 Insulation resistance tests
It is carried out to ensure that the insulation is mechanically and electrically sound in that no
current leakages which may lead to short circuiting are experienced. ‘Meggar’ is the most
preferred instrument here

 Polarity test
It is a test that creates a circuit using the phase conductor and the single pole
device in question, breaking the circuit when operating the device hence change
and thus confirming that the device must be connected in the phase conductor.
 Earth electrode resistance test
This is the resistance offered by the earth electrode to the flow of current into the
ground and measured between the electrode and the point of zero potential.
 Earth fault loop impedance test
It is a test carried out to verify that if a fault occurs in an electrical installation,
sufficient current will flow to operate the fuse or circuit breaker protecting the
faulty circuit within a predetermined time.

4. While working in a packaging section of a sugar factory, a colleague of yours has

already installed a motor as per the schematic diagram shown in Figure Q below.
What are some of the visual inspection are you likely to carry out before performing
necessary tests? (Made a table of the observation checklist) [20 marks]

13
 Figure Q

Compponent/Observation Done As
Expected
YES NO
1. Bending of angles done correctly

2. DB mounted and wired correctly

3. Isolator mounted correctly and wired

4. Start and stop buttons wired

5. Contactor relays wired

6. Thermal overload wired correctly

7. Motor mounted and wired correctly

8. Installed the circuit to conform with relevant regulation and requirements.

14
 9. Carried out housekeeping as per workshop procedures

10. Stored tools and equipment as per the workplace procedure and organization
policy

SECTION C: EXTENDED RESPONSE QUESTIONS MARKS SHEET

Candidate’s name & Registration No.
Assessor’s name & Reg. code

Unit(s) of Competency

Venue of Assessment

Date of assessment:

Question Marks Marks

Available Obtained

Question 1 4
Question 2 8
Question 3 18
Question 4 20
TOTAL: 50 (100%) `

The candidate was found to be: Competent Not yet competent

(The candidate is competent if s/he gets 50% or

higher)
Comments by Assessor:

15
Figure G

16
 OBSERVATION CHECKLIST

Candidate’s name & Registration No.

Assessor’s name & Id code
Unit(s) of Competency
Venue of Assessment
Date of assessment

Items to be evaluated: Yes No Comments

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18
19
20
21

PRODUCT CHECKLIST
17
 Yes No Comments
18.
19.
20.
The candidate was found to be: Not yet competent
Competent (Please tick as appropriate)

(The candidate is competent if s/he gets …... items of the with items ……
…..items correct
being
critical.

Feedback from candidate:

Feedback to candidate:

Candidate’s signature: Date:

Assessor’s signature:
Date:

18
 ASSESSMENT RECORDS

Qualification & Level

Unit of competency

Candidate details:
Candidate Name:
Candidate registration
no.:
Candidate Signature: Date (d/mm/y)
Assessor details: Assessor Name:
Assessor Reg. Code:
Assessor Signature: Date (d/mm/y)
Verifier details: Verifier name:
Verifier Reg. Code:
Verifier signature: Date (d/mm/y)

OUTCOME
ASSESSMENT TASK (Please tick (√) as appropriate)
Competent Not yet competent
1. Multiple choice questions
Assessment

2. Written Assessment
3. Practical assessment
Assessment outcome (Please tick (√) as appropriate)
(Tick as appropriate.
Candidate is competent if found Competent
competent in each of the
assessment tasks in this
assessment) Not yet competent

Feedback from candidate: Candidate Signature:

Date:

Feedback to candidate: Assessor Signature:

Date:

Feedback from verifier Verifier Signature:

Date:

19
PREPARED BY
WILSON AURA MUTAMBA
0712606683
Email: mutambawilson@gmail.com

20