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Advanced Electrical Installation Work 2365 Edition. City and Guilds Edition

Trevor Linsley

Chapter 5

Electrical installations: Inspection, testing and commissioning - all with Video Answers

Educators

Chapter Questions

Problem 1

A tong test instrument can also correctly be called:
a. a continuity tester
b. a clip-on ammeter
c. an insulation resistance tester
d. a voltage indicator.

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Problem 2

All electrical test probes and leads must comply with the standards set by the:
a. BS EN 60898
b. BS 7671
c. HSE Guidance Note GS 38
d. IET Regulations Part 2.

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Problem 3

When making a test to determine the presence or absence of a voltage, the HSE recommends that for our own safety we should use:
a. any old tester bought at a car-boot sale
b. a multimeter set to the correct voltage
c. a proprietary test lamp
d. a voltage indicator.

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Problem 4

For electrical test results to be valid the test instruments used:
a. must be new
b. must be of an approved type
c. must have a calibration certificate
d. must have a digital readout.

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Problem 5

The test required by the IET Regulations to ascertain that the CPC is correctly connected is called:
a. a basic protection
b. continuity of ring final circuit conductors
c. continuity of protective conductors
d. earth electrode resistance.

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Problem 6

One objective of the polarity test is to verify that:
a. lamp holders are correctly earthed
b. final circuits are correctly fused
c. the CPC is continuous throughout the installation
d. the protective devices are connected in the live conductor.

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Problem 7

When testing a $230 \mathrm{~V}$ installation an insulation resistance tester must supply a voltage of:
a. less than $50 \mathrm{~V}$
b. $500 \mathrm{~V}$
c. less than $500 \mathrm{~V}$
d. greater than twice the supply voltage but less than $1000 \mathrm{~V}$.

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Problem 8

The value of a satisfactory insulation resistance test on each final circuit of a $230 \mathrm{~V}$ installation must be:
a. less than $1 \Omega$
b. less than $0.5 \mathrm{M} \Omega$
c. not less than $0.5 \mathrm{M} \Omega$
d. not less than $1 \mathrm{M} \Omega$

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Problem 9

Instrument calibration certificates are usually valid for a period of:
a. 3 months
b. 1 year
c. 3 years
d. 5 years.

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Problem 10

The maximum inspection and re-test period for a domestic electrical installation is:
a. 3 months
b. 3 years
c. 5 years
d. 10 years.

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Problem 11

A visual inspection of a new installation must be carried out:
a. during the erection period
b. during testing upon completion
c. after testing upon completion
d. before testing upon completion.

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Problem 12

'To ensure that all the systems within a building work as they were intended to work' is one definition of the purpose of:
a. testing electrical equipment
b. inspecting electrical systems
c. commissioning electrical systems
d. isolating electrical systems.

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Problem 13

Use bullet points to state three reasons for testing a new electrical installation.

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Problem 14

State five of the most important safety factors to be considered before electrical testing begins.

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Problem 15

State the seven requirements of GS 38 when selecting probes, voltage indicators and measuring instruments.

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Problem 16

Use bullet points to describe a safe isolation procedure of a final circuit fed from an MCB in a distribution board.

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Problem 17

IET Regulation 611.3 gives a checklist of about 20 items to be considered in the initial visual inspection of an electrical installation. Make a list of ten of the most important items to be considered in the visual inspection process of a domestic property (perhaps by joining together similar items).

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Problem 18

State three reasons why electricians must only use 'approved' test instruments.

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Problem 19

State the first five tests to be carried out on a new electrical installation following a satisfactory 'inspection'. For each test:
a. state the object (reason for) the test
b. state a satisfactory test result.

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Problem 20

State the certification process for a:
a. new electrical installation and
b. an electrical installation that is being re-tested in order to provide an Electrical Installation Condition Report
c. what will be indicated on the test certificates
d. who will receive the test certificates and
e. who will issue the certificates
f. finally, who will carry out the actual testing (A. .person).

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Problem 21

State three safe working procedures relevant to your own safety when carrying out electrical testing.

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Problem 22

State three safe working procedures relevant to the safety of other people when carrying out electrical testing.

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Problem 23

State three safe working procedures relevant to the safety of other electrical systems when carrying out electrical testing.

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Problem 24

State the two important tests that a PAT tester carries out on a portable appliance.

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Problem 25

Use bullet points to state the reasons for commissioning a new building upon its completion.

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