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Level 3 Certificate in Electrotechnical Technology
Unit 2: Installation (Buildings and Structures): inspection,
testing and commissioning
Sample questions
All questions are worth six marks.
1. List three widely used types of
a. wiring system
b. wiring enclosure
2. When making an area safe to work in
a. list three procedures to be taken before commencing work
b. describe the permit to work procedure
3. When carrying out large contracts
a. list three parties likely to be concerned
b. state the purpose of a site record
4. Describe the use of the following in monitoring the progress of a contract
a. a bar chart
b. a site diary
c. variation orders
5. With reference to the application and use of residual current devices (RCD)
a. list three situations where RCD protection is required
b. state the primary function of an RCD
c. describe the term nuisance tripping
6.
a. Explain briefly the importance of verification of test instruments before
performing tests on an electrical installation.
b. State the purpose of each of the following types of test instrument:
i) Insulation Resistance tester
ii) tong tester
iii) PSCC tester
iv) low ohm reading meter
7. A 10 kW 230v shower is supplied using PVC/ PVC multicore cable clipped direct
to the surface over a distance of 15m. The circuit is protected by a BSEN 60898
type C circuit breaker. The ambient temperature is 25 deg C.
Determine
a. Installation method
b. Design Current
c. Circuit breaker rating
d. Correction factor
e. Minimum cable size
f. Voltage drop
8. Identify three items to be checked during the initial inspection process for
a. steel conduit
b. steel trunking
9. When completing additions to a circuit such as an extra socket
a. state the type of certificate to be issued
b. list three item of information that need to be entered on the form
c. state to who the form should be given
10. Describe briefly the purpose and types of information which relate to the
electrical installation of the following types of drawing:
a. site plan
b. block diagram
c. circuit diagram
11.
a. Explain the importance of coordinating electrical installation contracts with
other trades.
b. Describe one example where joiners/ carpenters may be held up due to lack of
coordination with electricians working on the same site.
c. Describe one example where plasterers may be held up due to lack of
coordination with electricians working on the same site.
12.
a. With the aid of a sketch, show how a 230 V single phase supply and a 400V
three phase supply is achieved within a sub-station using a transformer with
delta connected 11kV primary windings and star connected secondary
windings.
b. State two reasons for balancing the loads across a three-phase four-wire system
Level 3 Certificate in Electrotechnical Technology
Unit 2: Installation (Buildings and Structures): inspection,
testing and commissioning
Sample questions
All questions are worth six marks.
1. List three widely used types of
a. wiring system
b. wiring enclosure
2. When making an area safe to work in
a. list three procedures to be taken before commencing work
b. describe the permit to work procedure
3. When carrying out large contracts
a. list three parties likely to be concerned
b. state the purpose of a site record
4. Describe the use of the following in monitoring the progress of a contract
a. a bar chart
b. a site diary
c. variation orders
5. With reference to the application and use of residual current devices (RCD)
a. list three situations where RCD protection is required
b. state the primary function of an RCD
c. describe the term nuisance tripping
6.
a. Explain briefly the importance of verification of test instruments before
performing tests on an electrical installation.
b. State the purpose of each of the following types of test instrument:
i) Insulation Resistance tester
ii) tong tester
iii) PSCC tester
iv) low ohm reading meter
7. A 10 kW 230v shower is supplied using PVC/ PVC multicore cable clipped direct
to the surface over a distance of 15m. The circuit is protected by a BSEN 60898
type C circuit breaker. The ambient temperature is 25 deg C.
Determine
a. Installation method
b. Design Current
c. Circuit breaker rating
d. Correction factor
e. Minimum cable size
f. Voltage drop
8. Identify three items to be checked during the initial inspection process for
a. steel conduit
b. steel trunking
9. When completing additions to a circuit such as an extra socket
a. state the type of certificate to be issued
b. list three item of information that need to be entered on the form
c. state to who the form should be given
10. Describe briefly the purpose and types of information which relate to the
electrical installation of the following types of drawing:
a. site plan
b. block diagram
c. circuit diagram
11.
a. Explain the importance of coordinating electrical installation contracts with
other trades.
b. Describe one example where joiners/ carpenters may be held up due to lack of
coordination with electricians working on the same site.
c. Describe one example where plasterers may be held up due to lack of
coordination with electricians working on the same site.
12.
a. With the aid of a sketch, show how a 230 V single phase supply and a 400V
three phase supply is achieved within a sub-station using a transformer with
delta connected 11kV primary windings and star connected secondary
windings.
b. State two reasons for balancing the loads across a three-phase four-wire system
