Scribd
Upload
340 views3 pages

Assignment 2

The document contains questions related to electrical installations grouped into 6 sections for different student groups. It covers topics such as: - Components of an electrical installation and their purpose - Tests and safety precautions for installations - Common faults in equipment and methods for troubleshooting - Regulations and standards for electrical work - Principles of earthing, circuit breakers, and other protection devices - Producing layout diagrams for wiring plans The questions test understanding of electrical concepts like single line diagrams, cable sizing factors, emergency lighting and RCD operation, fire safety protocols, and producing designs for simple household circuits. Responses require explanations, diagrams, calculations, and distinguishing between technical terms.

Uploaded by

arafatmusoke96
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
340 views3 pages

Assignment 2

The document contains questions related to electrical installations grouped into 6 sections for different student groups. It covers topics such as: - Components of an electrical installation and their purpose - Tests and safety precautions for installations - Common faults in equipment and methods for troubleshooting - Regulations and standards for electrical work - Principles of earthing, circuit breakers, and other protection devices - Producing layout diagrams for wiring plans The questions test understanding of electrical concepts like single line diagrams, cable sizing factors, emergency lighting and RCD operation, fire safety protocols, and producing designs for simple household circuits. Responses require explanations, diagrams, calculations, and distinguishing between technical terms.

Uploaded by

arafatmusoke96
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 3

Installation Assignment.

Group 1.

(a) What is an electrical installation? [2 Marks]


(b) List down any three tests that may be performed on an electrical installation
before supply is connected. [4 Marks]
(c) Distinguish between a wire and a cable. [2
Mark]
(d) Using a single Line Diagram (SLD) define a power system. (3 marks)
(e) Briefly explain the three main types of faults found in motors. [3 Marks]
(f) What is the role of the commissioning engineer in electrical installation
projects?
(g) List the five major components of Personal Protective Equipment.

(h) Give reasons why earthing is important in electrical Installations.

Group 2.

(a) Draw a typical distribution board clearly showing the different circuits
and their current ratings or fuse ratings. (8 marks)

(b) Clearly starting the assumptions taken into consideration prove from
first principles that:- (8 marks)
100 P
Short-circuit MVA = X%

What is the importance of a contract in electrical installation projects?

(a) Distinguish between layout drawings and wiring diagrams using simple
illustrations as applied in electrical installation work.
(b) List down any four factors which influence the current rating of a cable.

(c) Using a simple diagram, explain how a non – maintained emergency lighting
system works.
(d) Explain how a residual current circuit breaker (RCD) works.

Group 3
(a) By use of suitable examples, describe what you understand by the term
troubleshooting as applied in engineering. [2 Marks]
(b) Explain the three major causes of faults in an electrical installation or piece
of equipment. [6 Marks]
(c) What does isolation of supply mean in electrical power systems?
[2 Marks]
(d) Describe the operating principles of a growler in an industry? [3 Marks]
(e) Explain how insulation resistance testing is conducted in an electrical
installation. [7 Marks]

Group 4
(a) Distinguish between statutory and non-statutory regulations. Give at least
one example in each case. [3 Marks]
(b) Explain some of the basic precautions you should take in the event of fire.
[5 Marks]
(c) Write short notes on the following [3Marks Each]
(i) Class A Fires
(ii) Class B Fires
(iii) Water Extinguishers
(iv) Powder Extinguishers

Group 5

a) Distinguish between system earthing and Equipment earthing. [4 Marks]


b) Explain the procedure one takes in order to make an overhead line safe
to work on during maintenance. [5 Marks]
c) Define step, touch and mesh Potential. [3Marks]
d) Calculate the earthing resistance of an earthing electrode of length 3m
and its diameter is 2cm driven in the earth of 60Ωm resistivity. What
would be the resistance value if a similar rod was put in parallel at a
distance 3m apart? [8Marks]

Group 6

a) Why circuit breakers are preferred in large power systems as compared


to fuses? [2 Marks]
b) Explain the principle of Arcing in circuit breakers. [3 Marks]
c) Distinguish between Restriking and Recovery voltage. [ 2Marks]
d) What is the importance of oil in:-
I. Circuit breaker [1Marks]
II. Power Transformer [2 Marks]
e) You are consulted to do house wiring for the house below, draw a lay out
diagram to represent your plan. (10 marks)
i) 1 Master bedroom with a double socket point. One center lighting
point and two wall brackets.
ii) The second bedroom with a single socket outlet and a center
lighting point
iii) A cordial with a two-way lighting point
iv) A bell at the entrance and a florescent in the Sitting room.

END

You might also like