Electrical Installations Archives - Page 3 of 3

Course introduction

17th edition course also known as Requirements for Electrical Installations (BS 7671 : 2008 Incorporating Amendment No. 1 : 2011) is the first step towards career in electrical industry through short course route. This course is Level 3 from City & Guilds (2382) and EAL (600/3719/2). With government’s approach to reduce unsafe wiring and electrical works it has become practically mandatory to hold certain competence certificate in order to carry out electrical work or get employment as electrician, where this qualification is acceptable for beginners.

Course StructureAssessment DetailsEntry RequirementsCareer OptionsPractice Questions

This is a classroom based 3 days course which covers various aspects related to the electrical installations. Main focus of the regulations is to make the installation safe in all the aspects possible. During this course we cover 7 parts from BS 7671 : 2008 ( 2011), namely:
1. Scope, object and fundamental principals
2. Definitions
3. Assessment of general characteristics
4. Protection for safety
5. Selection and installation of equipment
6. Inspection and testing
7. Special installations or locations
Followed by numerous practice questions to boost confidence and get the students familiarise with the exam methodology.

At the end of the course there is an open book multiple choice online exam for 2 hours.

There are no formal requirements to enrol for the course but we insist the students should have keen interest in electrical technology and should be able to understand and communicate in English.
All students must have a copy of IEE Wiring Regulations 17th edition, BS7671:2008, ISBN: 978-1849192699

Upon successful completion of it students will receive a Level 3 certificate which will help them in registering for ECS Card and with JIB. This will help the students in finding work as Junior Electrical Installers.

17th Edition Practice Questions

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Question 1

Parts 3 to 7 of BS 7671 set out in greater detail the methods and practices which are regarded as meeting the requirements of

A	Chapter 11
B	Chapter 12
C	Chapter 13 Hint: 120.3
D	Part 2

Question 2

BS 7671 does not apply to

A	agricultural installation
B	caravan site installations
C	The d.c. side of cathodic protection systems Hint: 110.2
D	horticultural installations

Question 3

Before PME (TN-C-S) supply will be granted by the local distributor the installation must comply with the

A	British Standards 6907
B	IEE On-Site Guide
C	Codes of Practice for Electrical Installations
D	Electrical Safety Quality and Continuity Regulations Hint: 114.1 & Appx 2 . 3

Question 4

During erection and initial verification of electrical installations, the installation of electrical equipment shall:

A	Take account of manufacturers’ instructions Hint: 134.1.1
B	Not install according to the manufacturer’s instructions
C	Be installed in accordance with the instructions provided by the manufacturer
D	Installed as per BS7671 only.

Question 5

Circuit for transmission of signals intended for control, detection, supervision or measurement of the functional status of a main circuit is

A	Wire
B	Auxiliary Circuit Hint: Def
C	Distribution Circuit
D	Circuit

Question 6

The protective conductor connecting the main earthing terminal of an installation to an earth electrode or to other means of earthing is

A	a main protective bonding conductor
B	an earth continuity conducto
C	a circuit protective conductor
D	the earthing conductor Hint: Def

Question 7

A Person adequately advised or supervised by a skilled person(s) as defined are

A	Instructed person
B	Competent person
C	Instructed person (electrically) Hint: Def
D	Competent person (electrically)

Question 8

All electrical equipment forming part of an electrical installation shall

A	enquiry to the local council offices
B	meet the appropriate electromagnetic compatability (EMC) requirements Hint: 332.1
C	not consider electromagnetic compatability with other equipment
D	comply to the Building Regulations

Question 9

Every installation should be divided into circuits in order to avoid

A	fuse discrimination problems
B	danger and to minimise inconvenience in the event of a fault Hint: 314.1
C	unauthorised interference with safety supplies
D	wiring impracticability

Question 10

An industrial type distribution board supplies the following; 4 x three-phase three-wire motors 2 x three-phase four-wire space heaters 4 x single-phase ring final circuits 2 x single-phase lighting circuits Excluding the supply cables, the number of live conductors enclosed within the fuse board would be

A	21
B	28
C	32
D	40 Hint: def of Live

Question 11

Which of the following is a general category of external influences

A	Building Hint: App5
B	Location
C	Wiring system
D	Maximum demand

Question 12

Which of the following is not an essential requirement when considering the frequency of maintaining installed electrical equipment?

A	The name and address of the conductor is permanently displayed adjacent to the equipment? Hint: 341.1
B	Any protective measures of safety remain effective.
C	the reliability of equipment is sustained.
D	Any periodic inspection and testing may be readily safely carried out

Question 13

In a. c. system, additional protection by means of an RCD in accordance with Regulation 415.1 shall be provided for:

A	flexible cables not liable to mechanical damage should be visible throughout their length
B	mobile equipment with a current rating exceeding 32 A for use outdoors socket - outlets with a rated current not exceeding 20 A
C	dedicated socket outlets with a specific label socket-outlets with a rated current not exceeding 20 A Hint: 411.3.3
D	dedicated socket outlets with a specific label

Question 14

The characteristics of the protective devices and circuit impedance's shall fulfill:

A	Zs x I a ≤ Uo Zs x I ≤ Uo
B	Zs = R1+R2 -Ze
C	Zs x I a ≤ Uo x C min Hint: 411.4.5
D	Ze = R1 -R2+Zs

Question 15

Within domestic (household) premises, consumer units and similar switch gear assemblies shall comply with BS EN 61439-3 and shall:

A	have their enclosure manufactured from combustible material
B	Be manufactured to a particular size and shape
C	have their enclosure manufactured from non-combustible material Hint: 421.1.201
D	Be manufactured to another BS EN standard

Question 16

Where particular risks of fire exist in an area of high density occupation with difficult conditions of evacuation, the external influence code would be

A	AD4
B	CA1
C	BD3
D	BD4 Hint: 422.2

Question 17

When considering over voltage protection, direct lightning strikes on the low voltage lines of the supply network are

A	not taken into account Hint: 443.1.1
B	direct to earth
C	taken into account
D	directed through a discharge device

Question 18

A powertrack system shall satisfy the test specified in BS EN 61534 for

A	resistance to moisture
B	resistance to flame propagation Hint: 422.3.4
C	arcing
D	the use of class II equipment

Question 19

The earth fault loop impedance Zs for a final circuit determined b

A	R1+R2+RL
B	R1+R2+Ze
C	RL -Ze
D	R1+R2 -Ze

Question 20

A motor which is automatically / remotely controlled or not continuously supervised shall be protected against

A	operating at their rated curren
B	operating at a current lower than their rated curren
C	over-temperature in all operational modes. Hint: 422.3.7
D	over-temperature in any mode

Question 21

A socket outlet used for a SELV system must

A	not have a protective conductor contact Hint: 414.4.3
B	be coloured yellow
C	be marked SELV
D	have a protective conductor contact

Question 22

Locations containing forced air heating systems, appliances producing hot water or steam and space heating appliances must comply with

A	competent persons scheme register
B	BS EN 60898
C	design and appearance criteria
D	the appropriate parts of the Building Regulations Hint: 424.1

Question 23

Under measures against electromagnetic disturbances, those involved in the design, installation and maintenance of , and alterations to electrical installations shall

A	Ensure it is mounted on a non-combustible surface
B	give adequately ventilation
C	give due consideration to various other measures Hint: 444.1
D	ensure it is of an all-insulated construction

Question 24

The maximum time (t) in seconds in which a given fault current can raise a conductor to its final limiting temperature can be found from the formula, given that k = 115 S = 95 I = 16,000 A t = time in seconds the value of t is

A	0.466 s Hint: 434.5.2
B	0.683 s
C	0.745 s
D	0.826 s

Question 25

To provide protection against electric shock, the protective measure of double or reinforced insulation relies on basic insulation and

A	bonding
B	connection of exposed metalwork to the protective conductor
C	earthing in the fixed wiring of the installation
D	supplementary insulatio Hint: 412.1.1

Question 26

The maximum permitted earth fault loop impedance for a distribution circuit protected by a BS 88-2 general purpose 32 A fuse as part of a TN system is

A	1.09 Ω
B	1.14 Ω
C	1.20 Ω
D	1.70 Ω Hint: Table 41.4

Question 27

Except where PME conditions apply, the main protective bonding conductor should have a cross-sectional area of not less than

A	half the required csa of the earthing conductor Hint: 544.1.1
B	the csa of the earthing conductor of the installation subject to a minimum of 6 mm 2
C	twice the csa of the earthing conductor
D	10 mm2

Question 28

If a cable is totally enclosed in thermal insulation for a distance of 2 m, the derating factor (Ci) will be

A	0.5 Hint: 523.9
B	0.55
C	0.68
D	0.81

Question 29

A symbol used in diagrams or documentation indicating an item shall comply with

A	IEC 60617 Hint: 514.9.1
B	BS EN 61534-1
C	BS EN 60898-7
D	IEC 60309-2

Question 30

The type of building construction is an external influence which, in an electrical installation, will affect the choice of

A	equipment and wiring Hint: 522
B	supply frequency
C	overcurrent protection
D	supply voltage

Question 31

Wiring systems in escape routes shall be supported such tha

A	they will not be liable to premature collapse in the event of a fire Hint: 521.11.201
B	they become intrusive in the event of escap
C	they do not affect any other circuit
D	they become liable to premature collapse

Question 32

To prevent circulating eddy currents in steel conduit, trunking or cable armouring

A	only dc must be use
B	line and neutral conductors are to be kept separat
C	the enclosure should be solidly earthed
D	all live conductors of a circuit must be contained in the same enclosure Hint: 521.5.1

Question 33

A cable installed in a wall or partition at a depth of less than 50mm from the surface of the wall or partition shall be protected by

A	incorporated within an earthed metallic conduit
B	Not under any circumstances.
C	Mechanically protected
D	Addition all protection having the characteristics specified in Regulation 415.1 Hint: 522.6.201

Question 34

A fire-fighter’s switch should be installed at not more than

A	2 m from the ground and with the off position at the to
B	2 m from the ground and with the off position at the bottom and coloured red
C	2.75 m from the ground and with the off position at the bottom
D	2.75 m from the ground and with the off position at the top and coloured red Hint: 537.6.3 & 537.6.4

Question 35

An RCD that is installed for protection against the risk of fire must be

A	integral to the socket outle
B	installed at the origin of the circui Hint: 532.1
C	rated at 500 m
D	arrangd to switch line conductors only

Question 36

The earthing arrangement for the system shown is classified as

A	TT
B	TN-S Hint: Def
C	TN-C-S
D	TN

Question 37

Which of the following is not recognized by BS 7671 as suitable for acting as an earth electrode?

A	Non-corrosive metallic coverings of cables.
B	Earth plates.
C	Underground structural metalwork embedded in foundations.
D	Water utility supply pipes Hint: 542.2.6

Question 38

Where a circuit-breaker may be operated by an ordinary person it shall

A	be under the supervision of a skilled person
B	be of any type
C	be designed or installed so that it cannot be modified without a key or tool Hint: 533.1.2
D	protected by a 30mA RCD

Question 39

A circuit shall be designed, arranged and protected to limit dangers resulting from a fault between the control circuit and other conductive parts liable to cause malfunction of the controlled equipment are specified as

A	Auxiliary circuits
B	Control circuits Hint: 557.3.201
C	Emergency circuits
D	Fault circuits

Question 40

Which conductor connects to the gas, water or other services entering an electrical installation?

A	The circuit protective conductor
B	The main protective bonding conductor Hint: 544.1.2
C	Earth electrode
D	Earthing conductor

Question 41

Where a consumers supply forms part of a TN-C-S system, the main protective bonding conductor must have a minimum cross-sectional area of

A	4.0 square millimeter
B	6.0 square millimiter
C	10.0 square millimiter Hint: 544.1.1 Table 54.8
D	16.0 square millimiter

Question 42

Where a generating set is used as an additional source of supply in parallel with another source, which one of the following conditions must be fulfilled

A	the distributor has been informed
B	existing equipment is adequate for any additional load
C	an RCD shall disconnect all live conductors, including neutral conductors Hint: 551.7.1 (ii)
D	existing equipment meets BS and BS EN standards

Question 43

In order to ensure mechanical strength within an auxiliary circuit the minimum CSA for a single core stranded copper wire on a control circuit is

A	0.1 square millimeter
B	0.5 square millimeter Hint: 557.4.1 Table 55.2
C	any size
D	that enables the maximum demand to be determined

Question 44

At each fixed lighting point which of the following shall not be used for termination

A	A B15 fitting Hint: 559.5.1
B	A ceiling rose to BS 67
C	A luminaire to BS EN 60598
D	A connection unit to BS 1363-4

Question 45

Four of the tests listed in BS 7671 are 1. Earth fault loop impedance 2. continuity of ring final circuit conductors 3. Insulation resistance 4. Continuity of protective conductors The correct sequence for carrying out these tests is

A	1, 2, 3 and 4
B	2, 3, 4 and 1
C	4, 2, 3 and 1 Hint: 612.1
D	2, 4, 1 and 3

Question 46

Which one of the following is the minimum acceptable insulation resistance value if the nominal voltage of the circuit is 400 V

A	0.25 MΩ
B	0.50 MΩ
C	1.00 MΩ Hint: 612.3.2 Table 61
D	2.00 MΩ

Question 47

Electrical Installation Certificate, EICR and MEIWC shall be compiled and signed or authenticated by

A	skilled persons, competent to verify the standards have been met Hint: 631.4
B	A designer
C	Competent persons, competent to verify the standards have been met
D	Ordinary person

Question 48

In a room containing a bath or shower RCD having characteristics of Reg 415.1 shall

A	be provided for SELV circuits onl
B	be provided for low voltage circuits passing through zones 1 and 2, not serving that location. Hint: 701.411.3.3
C	not be fitted as no requirement
D	be provided for fault protection

Question 49

When under-floor heating is provided in a swimming pool, the electric heating unit embedded in the floor should incorporate an earthed metallic sheath connected to

A	the local supplementary equipotential bonding Hint: 702.55.1
B	the main protective equipotential bonding
C	the main earthing terminal of the installation
D	an independent earth electrode

Question 50

On a construction site, the particular requirements of section 704 of BS 7671 will apply to the

A	site canteen
B	fixed and movable installations Hint: 704.1.1
C	staff toilets
D	site office(s)

Question 51

For fire protection purposes in a cattle shed, circuits must be protected by using a

A	30 mA RCD
B	6 A type B circuit breaker
C	300 mA RCD Hint: 705.422.7
D	6 A type C circuit breaker

Question 52

Electrical equipment installed in Zones 1 and 2 of communal baths or communal showers, where water jets are likely to be used for cleaning purposes, should have a minimum degree of protection against external influences of

A	IPX3
B	IPX4
C	IPX5 Hint: 701.512.2
D	IPX6

Question 53

Where a TN system of earthing is used in a marina, the final circuits for the supply of a pleasure craft must not be connected to

A	an earth electrode
B	a PME terminal Hint: 709.411.4
C	any RCDs
D	protective devices

Question 54

The minimum cross-sectional area of a flexible cord or cable for a caravan connection having a rating of 16 A is

A	1.5 square millimeter
B	2.5 square millimeter Hint: 721.55.2.6 Table 721
C	4.0 square millimeter
D	6.0 square millimeter

Question 55

Which of the following lighting installations are not included within the scope of o utdoor lighting installations

A	Temporary festoon lighting Hint: 714.1
B	Bus shelters
C	Road signs
D	Telephone kiosks

Question 56

Main protective bonding conductors within a mobile or transportable unit must be

A	omitted
B	solid core
C	finely stranded Hint: 717.411.3.1.2
D	connected to the supply neutral

Question 57

The minimum degree of IP protection for equipment in seashore locations is

A	IP6X
B	IPX4
C	IPXXD
D	IPX6 Hint: 709.512.2.1.1

Question 58

A flexible cable used in extra-low voltage lighting installations with a maximum length of 3 m can have a CSA of

A	1.5 square millimeter
B	1.5 square centimeter
C	1 square millimeter Hint: 715.524.201
D	4 square millimeter

Question 59

Details of the measurement of earth fault loop and the consideration of resistance change due to temperature change is contained in

A	Appendix 8
B	Appendix 10
C	Appendix 11
D	Appendix 14 Hint: Appx 14

Question 60

The voltage drop for a shower circuit supplied directly from the public distribution network should not exceed

A	3%
B	4%
C	5% Hint: Appx 4
D	6%

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17th Edition Wiring Regulations ( City & Guilds 2382) Course

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