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A set of 60 questions that are follow the format of the real wiring regulations test.

Welcome to a Mock Exam for the Wiring Regulations

This practice test will select 60 random questions, proportioned to the different sections of the IET Wiring Regulations just like the real exam. You will be expected to complete the practice test within the allocated 2 hour time limit. You will be shown correct and incorrect answers at the end of the quiz.

Each question is representative of the type used in the 8 parts of the real C&G test. Don't forget that the test is 'open book' so you can use your copy of the Wiring Regulations to help answer the questions.

Instructions:

The test will begin after you select the 'Start Quiz' button below.
For each question, choose from the multiple choice answers provided.
After the last question, click 'Submit' to be shown your results.

Ready? Click 'Start Quiz' to begin.

Part 1 - Scope, Object and Fundamental Principles

BS 7671:2018 applies to electrical installations in which locations?

Aircraft

Public premises

Mines and quarries

Ships

None

Part 1 - Scope, Object and Fundamental Principles

The selection of protective equipment would NOT typically consider the effects of:

Equipment costs

Earth fault current

Undervoltage

Overcurrent

None

Part 1 - Scope, Object and Fundamental Principles

Who determines the interval between initial verification and the first periodic inspection of an installation?

Local Authority Building Control

The client

The designer

The installer

None

Part 1 - Scope, Object and Fundamental Principles

Parts 3 to 7 of BS 7671 detail methods and practices that meet the requirements of which chapter?

Chapter 11

Part 2

Chapter 13

Chapter 12

None

Part 2 - Definitions

What is the term for current passing through a person or livestock causing an electric shock likely to have dangerous effects?

Earth fault current

Short circuit current

Shock current

Earth leakage current

None

Part 2 - Definitions

The effect on design and safe operation caused by the type of building construction is called:

The nature of the supply

An external influence

Compatibility

Installation arrangements

None

Part 3 - Assessment of General Characteristics

Which characteristic is considered in relation to maintaining continuity of service?

Type of wiring system used

Selecting protective devices for selectivity

Size and future-proofing of containment systems

Maximum current demand

None

Part 3 - Assessment of General Characteristics

When assessing the maximum demand of an installation, which factor may be considered?

Diversity

Arrangement of live conductors

Type of earthing arrangement

Discrimination

None

Part 3 - Assessment of General Characteristics

Electrical equipment in locations like kiosks or shops within shops must be assessed for:

Safety services

Compatibility

Maintainability

Continuity of service

None

10.

Part 3 - Assessment of General Characteristics

One of the general categories of external influences is:

Method of installation

Earthing arrangements

Environment

Nature of supply

None

11.

Part 3 - Assessment of General Characteristics

For a ring final circuit where the CPC is not a metal covering or conduit, the protective conductor must:

Be run in a ring with both ends connected to the earthing terminal

Be wired in single-core cable

Be made of aluminum

Have a cross-sectional area not less than that of the live conductors

None

12.

Part 3 - Assessment of General Characteristics

A TN-C-S system is characterized by:

A separate protective conductor connecting the source earth to the consumer's main earth terminal

Exposed conductive parts connected to an independent earth electrode

Neutral and protective conductors combined throughout the system

Neutral and earth functions combined in a single conductor in part of the system

None

13.

Part 4 - Protection for Safety

In every installation, main protective bonding conductors must be connected to which of the following?

Exposed metallic structural parts of the building

Radiators

Metal pipes entering with insulated sections at entry

Local metallic pipework in bathrooms

None

14.

Part 4 - Protection for Safety

For a 5-second disconnection time, what is the maximum allowable Z<sub>s</sub> value for a 30 A BS 3036 fuse?

1.04 ohms

2.51 ohms

1667 ohms

1.51 ohms

None

15.

Part 4 - Protection for Safety

The use of obstacles and placing out of reach as protective measures is limited to installations accessible only to:

Skilled persons

Basketball stadiums

Instructed persons

Competent persons

None

16.

Part 4 - Protection for Safety

Regarding isolation and switching, the PEN conductor should generally not be isolated or switched in:

TN-C and TN-C-S systems

IT systems

TN-C and TT systems

IT and TT systems

None

17.

Part 4 - Protection for Safety

AFDDs compliant with BS EN 62606 are recommended for additional fire protection in AC circuits. Where might these devices be used?

Locations with combustible construction materials

Onboard ships

Electric fences covered by BS EN 60335-2-76

In radio interference suppression equipment

None

18.

Part 4 - Protection for Safety

Basic insulation of live parts or the use of barriers and enclosures provides:

Thermal protection

Impact protection

Fault protection

Basic protection

None

19.

Part 4 - Protection for Safety

To prevent burns, a non-metallic electrical part intended to be touched but not handheld should not exceed a surface temperature of:

70 °C

80 °C

65 °C

90 °C

None

20.

Part 4 - Protection for Safety

What is the disconnection time for a 16.0 mm² conductor with a 'k' factor of 115 carrying a fault current of 13 kA?

0.14 s

0.02 s

0.0125 s

2.26 s

None

21.

Part 4 - Protection for Safety

A conductor colored green-and-yellow throughout with additional blue markings at the terminations is a:

Line conductor

PEN conductor

Circuit protective conductor

Neutral conductor

None

22.

Part 4 - Protection for Safety

SELV can provide both basic and fault protection. A suitable source of SELV would be:

A 50 V storage battery

A 230/110 V single-phase generator

A 230 V diesel generator

A 230/50 V autotransformer

None

23.

Part 4 - Protection for Safety

Which classification of external influences applies to equipment exposed to an atmosphere with heavy dust?

AG1

BC1

AE1

AE6

None

24.

Part 4 - Protection for Safety

To perform urgent repairs on a machine in a factory, the type of switching provided should be for:

Safe operation

Mechanical maintenance

Emergency

Mechanical movement

None

25.

Part 4 - Protection for Safety

When the overcurrent device is intended for overload protection, I2 must NOT exceed lz times:

1.8

1.45

0.725

None

26.

Part 4 - Protection for Safety

A 230 V single-phase circuit supplying a pump motor is protected by a 20 A BS EN 60898 Type B circuit breaker. The minimum fault current to ensure compliance is:

100 A

20 A

200 A

150 A

None

27.

Part 4 - Protection for Safety

Where a means of isolation is provided, it must be:

Clearly labeled

Automatic in operation

Always adjacent to equipment

Available for emergency switching

None

28.

Part 5 - Selection and Erection of Equipment

Which of the following meets the requirements for wiring systems to be supported so they won't collapse in a fire?

Tie wraps

Trunking systems

Conduit systems

Steel or copper clips

None

29.

Part 5 - Selection and Erection of Equipment

To mitigate the effects of corrosive or polluting substances in an installation, one method is to:

Use protective tapes, paints, or grease

Use viscose insulated wiring systems

Install warning signs and notices

Avoid clipping cables directly

None

30.

Part 5 - Selection and Erection of Equipment

Every firefighter's switch must:

Be no more than 1.75 m above floor level

Comply with Part M of building regulations

Be easily visible, accessible, and appropriately labeled

Comply with BS EN 1362

None

31.

Part 5 - Selection and Erection of Equipment

The notice regarding an RCD requires the device to be tested using its test button:

Annually

Monthly

Quarterly

Every six months

None

32.

Part 5 - Selection and Erection of Equipment

What is the derating factor for a cable surrounded by thermal insulation over a length of 200 mm?

0.5

0.51

0.63

0.78

None

33.

Part 5 - Selection and Erection of Equipment

The magnetic circuit of an RCD shall enclose Mark one answer

All circuit conductors

All live conductors

All line conductors

PEN conductors

None

34.

Part 5 - Selection and Erection of Equipment

The minimum size of a buried copper earthing conductor not protected against mechanical damage or corrosion is Mark one answer

16 mm²

50 mm²

10 mm²

25 mm²

None

35.

Part 5 - Selection and Erection of Equipment

The minimum size of a protective conductor with a 'k' factor of 143 which disconnects in 0.3 s at a fault current of 800 A is Mark one answer

2.5 mm²

4.0 mm²

6.0 mm²

10.0 mm²

None

36.

Part 5 - Selection and Erection of Equipment

A distribution board containing circuits with high protective conductor currents shall have the information regarding these circuits positioned so as to be visible to Mark one answer

A person modifying or extending a circuit

An inspector

The user of the installation

The Distribution Network Operator

None

37.

Part 5 - Selection and Erection of Equipment

An installation and its generator are not permanently fixed. In a TN, TT or an IT system an RCD shall be installed with a maximum rating of Mark one answer

500 mA

30 mA

300 mA

100 mA

None

38.

Part 5 - Selection and Erection of Equipment

What is the correction factor for a cable surrounded by thermal insulation over a length of 200 mm?

0.63

0.5

0.75

None

39.

Part 5 - Selection and Erection of Equipment

When protection against overload is provided by a semi-enclosed fuse to BS 3036, the cable's current rating must be at least:

The nominal current rating of the fuse divided by 0.725

Equal to the design current of the circuit

0.725 times the fuse's current rating

0.725 times the design current of the circuit

None

40.

Part 5 - Selection and Erection of Equipment

What is the rating factor to be applied for eight equally loaded circuits grouped together in a conduit?

0.71

0.52

0.54

0.5

None

41.

Part 5 - Selection and Erection of Equipment

According to Regulation 434.5.2, what is the maximum permitted fault clearance time for a prospective fault current of 1000 A using a 25 mm² copper cable with 70°C thermoplastic insulation?

5 s

0.4 s

7.2 s

8.2 s

None

42.

Part 6 - Inspection and Testing

What is the minimum acceptable insulation resistance value on a SELV system?

>299 MΩ

>300 MΩ

2 MΩ

0.5 MΩ

None

43.

Part 6 - Inspection and Testing

The minimum value of insulation resistance and the applied test voltage for a 400 V circuit is Mark one answer

1.0MΩ at 1000 V d.c

0.5MΩ at 250 V d.c

1.0MΩ at 500 V d.c

1.0MΩ at 500 V a.c

None

44.

Part 6 - Inspection and Testing

Heating cables laid directly in soil, roads, or structures must be installed so they are:

Completely embedded in the substance they are intended to heat

Operated at 5°C

Fed only from an extra-low voltage supply

At least 1 m below the surface

None

45.

Part 6 - Inspection and Testing

For circuits of TN or TT systems, the outer contact of Edison screw lamp holders must be connected to the:

Earthing conductor

Phase conductor

Protective conductor

Neutral conductor

None

46.

Part 7 - Special Installations and Locations

On construction sites, the selection and erection of equipment must meet the standards set out in:

BS 7672

BS EN 61439-4

The On-Site Guide

BS EN 721786

None

47.

Part 7 - Special Installations and Locations

In embedded heating systems, what is the minimum air gap required between heating elements and ignitable structures to meet Chapter 42 requirements?

50 mm

100 mm

10 mm

125 mm

None

48.

Part 7 - Special Installations and Locations

Cables buried in arable land on a farm should be at a minimum depth of Mark one answer

1.0 m

0.5 m

6 m

0.6 m

None

49.

Part 7 - Special Installations and Locations

Electrical equipment installed outside in a caravan park shall have a mechanical impact code of at least Mark one answer

IK06

IK03

IK08

IK01

None

50.

Part 7 - Special Installations and Locations

Socket-outlets in a marina shall be protected Mark one answer

Individually by RCDs and overcurrent devices

BS 3036 fuses only

In groups by RCDs

Residual current monitoring devices

None

51.

Part 7 - Special Installations and Locations

What is the correct grouping factor for six circuits of three conductors per circuit run in the same conduit?

0.6

0.45

0.57

0.54

None

52.

Part 7 - Special Installations and Locations

Before being energized, every new installation must FIRST be:

Tested for continuity of ring circuit conductors

Given an insulation resistance test

Subjected to a detailed inspection

Tested for continuity of protective conductors

None

53.

Part 8 - Appendices

What is notable about a FELV system in a medical location?

Associated enclosures should be non-conductive

It should be tested in accordance with Chapter 6

It should not be relied upon for protection against shock

It should be fused on the supply side

None

54.

Part 8 - Appendices

On a construction site, which of the following is true regarding wiring systems used?

Installed cables should be steel wire armoured

Cables over roadways should be installed at a minimum height of 8 meters

Cables should not cross a road unless adequate mechanical protection is provided

Cables should be installed within a duct or containment system

None

55.

Part 8 - Appendices

What current value is typically required to disconnect a 6 A Type B circuit breaker to BS 60898 in 0.1 seconds?

12 A

8 A

6 A

30 A

None

56.

Part 8 - Appendices

The current-carrying capacity for a 2.5 mm², 70°C rated thermoplastic sheathed twin and earth flat cable installed within a stud wall (Method 103) is:

25 A

27 A

21 A

13.5 A

None

57.

Part 8 - Appendices

What is the minimum insulation resistance value when measured at the consumer unit of a 230 V domestic installation?

5.0 MΩ

0.25 MΩ

0.5 MΩ

1.0 MΩ

None

58.

Part 8 - Appendices

In agricultural premises, an RCD may be used for fire protection provided the operating current does not exceed:

100 mA

300 mA

500 mA

30 mA

None

59.

Part 8 - Appendices

For caravans using a mains electricity supply, an instruction notice must be fixed:

At or near the main distribution point

Near the main electrical isolating switch inside the caravan

Under the cover of the caravan electricity inlet box

On the inside of the main door of the caravan

None

60.

Part 8 - Appendices

In a swimming pool, which protective measure is NOT applicable to equipment installed in Zone 2?

SELV

Protection by earth-free local equipotential bonding

Individual protection by electrical separation

Protection by an RCD in accordance with Regulation 415.1.1

None

1 out of 60

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