18th Edition Mock

📘 Scope, Object and Fundamental Principles (Part 1)

Scope, Object and Fundamental Principles (Part 1)

BS 7671:2018+A2:2022, fully titled 'Requirements for Electrical Installations. IET Wiring Regulations', is jointly published by the British Standards Institution (BSI) and the Institution of Engineering and Technology (IET). The current 18th Edition incorporates Amendment 2:2022 and is the version assessed by the City & Guilds 2382-22 examination. Part 1 sets the framework and comprises three chapters: Chapter 11 (Scope), Chapter 12 (Object and Effects) and Chapter 13 (Fundamental Principles).

The scope (Regulation 110.1) covers electrical installations operating at a nominal voltage not exceeding 1000 V AC or 1500 V DC. For AC, the standard frequencies considered are 50, 60 and 400 Hz, though other frequencies for special purposes are not excluded. Regulation 110.1.1 lists the premises covered, including residential, commercial, public and industrial premises, agricultural and horticultural premises, prefabricated buildings, caravans and caravan parks, construction and demolition sites, marinas and highway equipment. Regulation 110.1.2 confirms the Regulations also apply to additions and alterations to existing installations.

Regulation 110.2 lists installations excluded from the scope:

The object (Chapter 12) is to provide rules for the design, erection and verification of installations so as to ensure the safety of persons, livestock and property, and proper functioning, in normal use. Chapter 13 (Fundamental Principles) is organised into Protection for Safety (131), Design (132), Selection of Electrical Equipment (133) and Erection and Initial Verification (134). Section 131 requires protection against electric shock, thermal effects, overcurrent, fault current, voltage disturbances/electromagnetic influences and power supply interruption.

BS 7671 is a non-statutory document: there is no direct legal duty to comply, but compliance is likely to satisfy relevant statutory law and may be used in a court of law as evidence of compliance. Regulation 114 states it should be cited in its entirety if referred to in a contract. The principal statutory provisions it supports include the Electricity at Work Regulations 1989, the Health and Safety at Work etc. Act 1974, the Electricity Safety, Quality and Continuity Regulations 2002 and the Building Regulations (Part P). At the origin, the distributor is responsible for the supply up to the point of supply, while the consumer (and installer) is responsible for the installation beyond it. Equipment should conform to the relevant BS or BS EN standard (Regulation 511).

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Sample questions (35)

1. What is the maximum nominal AC voltage of an electrical installation that falls within the scope of BS 7671?

  1. 230 V AC
  2. 400 V AC
  3. 1000 V AC
  4. 11 kV AC

The scope of BS 7671 applies to installations operating at a nominal voltage not exceeding 1000 V AC. (BS 7671:2018+A2:2022, Regulation 110.1.2)

2. What is the maximum nominal DC voltage for an installation to be within the scope of BS 7671?

  1. 120 V DC
  2. 750 V DC
  3. 1000 V DC
  4. 1500 V DC

BS 7671 applies to installations operating at a nominal voltage not exceeding 1500 V DC. (BS 7671:2018+A2:2022, Regulation 110.1.2)

3. Which set of AC frequencies is specifically considered as standard within the scope of BS 7671?

  1. 25 Hz, 50 Hz and 100 Hz
  2. 50 Hz, 60 Hz and 400 Hz
  3. 16.7 Hz, 50 Hz and 60 Hz
  4. 50 Hz only

BS 7671 considers the standard frequencies 50 Hz, 60 Hz and 400 Hz, though use of other frequencies for special purposes is not excluded. (BS 7671:2018+A2:2022, Regulation 110.1.2)

4. Which of the following premises is explicitly listed as being covered by the scope of BS 7671?

  1. Railway rolling stock
  2. Agricultural and horticultural premises
  3. Aircraft equipment
  4. Equipment on board ships

Regulation 110.1.1 lists agricultural and horticultural premises among the installations to which the Regulations apply. (BS 7671:2018+A2:2022, Regulation 110.1.1)

5. An electrician is asked to design the electrical installation for a new caravan park, including the hook-up points for individual pitches. Does BS 7671 apply to this work?

  1. No, because caravans are mobile and excluded
  2. Yes, caravans and caravan parks are within the scope of the Regulations
  3. No, caravan parks are covered only by the Building Regulations
  4. Only the supply pillars, not the caravan installations

Regulation 110.1.1 explicitly includes caravans and caravan parks within the scope of BS 7671. (BS 7671:2018+A2:2022, Regulation 110.1.1)

6. Which of the following is included within the scope of BS 7671?

  1. Lightning protection systems for buildings
  2. Highway equipment installations
  3. Signalling equipment for railways
  4. Electrical equipment of aircraft

Regulation 110.1.1 lists highway equipment among the installations covered, whereas the other options are specifically excluded. (BS 7671:2018+A2:2022, Regulation 110.1.1 / 110.2)

7. You are wiring the temporary distribution and supplies on a construction and demolition site. Which statement is correct regarding BS 7671?

  1. BS 7671 does not apply because the work is temporary
  2. The site is within the scope of BS 7671 and the Regulations apply
  3. Only the main intake position is covered by BS 7671
  4. Construction sites are covered only by the Electricity at Work Regulations, not BS 7671

Construction and demolition sites are listed in Regulation 110.1.1 as installations within the scope of BS 7671. (BS 7671:2018+A2:2022, Regulation 110.1.1)

8. Within which part and chapter of BS 7671 is the scope of the Regulations principally defined?

  1. Part 1, Chapter 11
  2. Part 2, Chapter 21
  3. Part 4, Chapter 41
  4. Part 1, Chapter 13

Part 1 is titled 'Scope, Object and Fundamental Principles', and Chapter 11 deals with the Scope of the Regulations. (BS 7671:2018+A2:2022, Part 1, Chapter 11)

9. Which of the following is the correct full title of BS 7671?

  1. Code of Practice for In-Service Inspection and Testing
  2. Requirements for Electrical Installations. IET Wiring Regulations
  3. Electricity at Work Regulations
  4. Guidance Note 3: Inspection and Testing

The full title of BS 7671 is 'Requirements for Electrical Installations. IET Wiring Regulations', jointly published by BSI and the IET. (BS 7671:2018+A2:2022, Title page)

10. Which two bodies jointly publish BS 7671?

  1. The HSE and the BSI
  2. The British Standards Institution (BSI) and the Institution of Engineering and Technology (IET)
  3. The IET and City & Guilds
  4. Ofgem and the BSI

BS 7671 is jointly published by the British Standards Institution (BSI) and the Institution of Engineering and Technology (IET). (BS 7671:2018+A2:2022, Title page / IET)

11. A client refers to a 'highway power supply' contract requiring works to street lighting feeder pillars and associated cabling. Which statement best reflects the scope position of BS 7671?

  1. Highway equipment is excluded as it is a public utility asset
  2. Highway equipment is within scope, so BS 7671 applies to the installation work
  3. BS 7671 applies only to the lamps, not the cabling
  4. Highway equipment is covered only by BS EN 62305

Highway equipment is one of the installations listed in Regulation 110.1.1 as being within the scope of BS 7671. (BS 7671:2018+A2:2022, Regulation 110.1.1)

12. Which of the following installation types is listed within the scope of BS 7671 alongside residential and commercial premises?

  1. Mines and quarries in all cases
  2. Marinas
  3. Aircraft
  4. Ships

Marinas are listed in Regulation 110.1.1 as installations to which the Regulations apply. (BS 7671:2018+A2:2022, Regulation 110.1.1)

13. Which installation is specifically EXCLUDED from the scope of BS 7671?

  1. Prefabricated buildings
  2. Equipment of railway traction and rolling stock
  3. Marinas
  4. Construction sites

Regulation 110.2 lists railway traction, rolling stock and signalling equipment among the installations to which the Regulations do not apply. (BS 7671:2018+A2:2022, Regulation 110.2)

14. Lightning protection systems for buildings and structures fall outside the scope of BS 7671. Which standard covers them instead?

  1. BS EN 62305
  2. BS EN 60898
  3. BS 5839
  4. BS EN 61439

Lightning protection systems are excluded from BS 7671 and are covered by BS EN 62305. (BS 7671:2018+A2:2022, Regulation 110.2)

15. An electrician is asked to maintain the electrical equipment installed on board a sea-going ship. Which statement is correct?

  1. BS 7671 applies in full to the ship's installation
  2. Equipment on board ships is excluded from the scope of BS 7671
  3. Only the shore supply, not the ship, is covered by BS 7671
  4. BS 7671 applies once the ship is in dry dock

Regulation 110.2 excludes equipment on board ships and offshore installations from the scope of BS 7671. (BS 7671:2018+A2:2022, Regulation 110.2)

16. Which group of installations is listed together as being outside the scope of BS 7671 under Regulation 110.2?

  1. Caravans, marinas and construction sites
  2. Motor vehicle equipment, aircraft equipment and certain mines and quarries
  3. Agricultural premises, highway equipment and prefabricated buildings
  4. Residential, commercial and industrial premises

Regulation 110.2 excludes equipment of motor vehicles, aircraft equipment, and certain mines and quarries from the scope. (BS 7671:2018+A2:2022, Regulation 110.2)

17. What is the legal status of BS 7671?

  1. It is an Act of Parliament
  2. It is a non-statutory document
  3. It is a Statutory Instrument enforced by the HSE
  4. It is an EU Directive

BS 7671 is a non-statutory document; there is no direct legal requirement to comply with it. (BS 7671:2018+A2:2022, Preface)

18. Because BS 7671 is non-statutory, which statement best describes its relationship with the law?

  1. There is no benefit to following it
  2. Compliance with BS 7671 is likely to achieve compliance with relevant statutory law
  3. Following it is illegal unless adopted by local by-laws
  4. It overrides all statutory requirements

Although there is no direct legal duty to follow BS 7671, compliance is likely to achieve compliance with the relevant statutory law. (BS 7671:2018+A2:2022, Preface / IET Wiring Matters)

19. In which way may BS 7671 be used in legal proceedings?

  1. It cannot be referred to in court under any circumstances
  2. It may be used in a court of law to claim compliance with statutory requirements
  3. It automatically convicts anyone who breaches it
  4. It replaces the need for any statutory regulation

Although non-statutory, BS 7671 may be used as evidence in a court of law to claim compliance with statutory requirements. (BS 7671:2018+A2:2022, Regulation 114.1)

20. Which statutory regulations does BS 7671 most directly help an installation to comply with?

  1. The Data Protection Act 2018
  2. The Electricity at Work Regulations 1989
  3. The Road Traffic Act 1988
  4. The Equality Act 2010

BS 7671 helps electrical installations comply with statutory law such as the Electricity at Work Regulations 1989. (BS 7671:2018+A2:2022, Chapter 11 / Appendix 2; HSE HSR25)

21. Which of the following is one of the principal statutory regulations associated with electrical installation safety in the UK?

  1. The Electricity Safety, Quality and Continuity Regulations 2002
  2. The Provision and Use of Work Equipment Regulations 1992
  3. The Gas Safety (Installation and Use) Regulations 1998
  4. The Pressure Systems Safety Regulations 2000

The Electricity Safety, Quality and Continuity Regulations 2002 (ESQCR) are among the principal statutory regulations BS 7671 helps installations comply with. (BS 7671:2018+A2:2022, Chapter 11 / Appendix 2)

22. A domestic kitchen rewire in a dwelling must satisfy which statutory requirement that BS 7671 helps to achieve?

  1. The Building Regulations (Part P)
  2. The Sale of Goods Act 1979
  3. The Consumer Rights Act 2015
  4. The Town and Country Planning Act 1990

The Building Regulations Part P apply to electrical work in dwellings, and compliance with BS 7671 helps achieve compliance with it. (BS 7671:2018+A2:2022; Building Regulations Part P)

23. According to Regulation 114, how should BS 7671 be referred to if it is cited within a contract?

  1. Only the specific regulation numbers should be quoted
  2. It should be cited in its entirety
  3. Only Part 1 needs to be referenced
  4. Only the latest amendment number is required

Regulation 114 states that the Regulations are intended to be cited in their entirety if referred to in any contract. (BS 7671:2018+A2:2022, Regulation 114.1)

24. Which is the current edition and amendment of the Wiring Regulations assessed by the City & Guilds 2382-22 examination?

  1. BS 7671:2008+A3:2015
  2. BS 7671:2018+A2:2022
  3. BS 7671:2018 (no amendments)
  4. BS 7671:2018+A1:2020

The 18th Edition incorporating Amendment 2 (BS 7671:2018+A2:2022) is the version assessed by City & Guilds 2382-22. (BSI / IET; City & Guilds 2382-22 qualification handbook)

25. What is the stated object of BS 7671 as set out in Chapter 12?

  1. To set electricity tariffs for consumers
  2. To provide for the safety of persons, livestock and property, and proper functioning in normal use
  3. To register competent electricians
  4. To define the duties of the network operator

Chapter 12 states that the object is rules for design, erection and verification to provide for safety of persons, livestock and property and proper functioning in normal use. (BS 7671:2018+A2:2022, Chapter 12)

26. You are adding a new ring final circuit to an existing domestic installation. To what extent does BS 7671 apply?

  1. BS 7671 does not apply to existing installations at all
  2. BS 7671 applies to additions and alterations to existing installations
  3. Only the consumer unit, not the new circuit, must comply
  4. BS 7671 applies only to brand-new complete installations

BS 7671 applies to additions and alterations to existing installations as well as to new installations. (BS 7671:2018+A2:2022, Regulation 110.1.2)

27. When adding a new circuit to an older existing installation, what must be confirmed about the existing arrangements before the addition is energised?

  1. Nothing, as the existing installation is exempt
  2. That the existing earthing and bonding arrangements are adequate for the addition
  3. Only that the existing cables are the same colour as the new ones
  4. That the whole installation is rewired to current standards first

Additions and alterations must comply with BS 7671, which requires confirming that the existing earthing, bonding and protective arrangements are adequate to support the new work. (BS 7671:2018+A2:2022, Regulation 110.1.2 / 132.16)

28. Which Regulation in BS 7671 lists the installations to which the Regulations do NOT apply?

  1. Regulation 110.1
  2. Regulation 110.2
  3. Regulation 120.1
  4. Regulation 131.1

Regulation 110.2 sets out the installations and equipment that fall outside the scope of BS 7671, such as railway traction and ships' equipment. (BS 7671:2018+A2:2022, Regulation 110.2)

29. Which of the following is specifically excluded from the scope of BS 7671 under Regulation 110.2?

  1. Domestic dwellings
  2. Railway traction, rolling stock and signalling equipment
  3. Caravan parks
  4. Agricultural premises

Railway traction equipment, rolling stock and signalling equipment are listed in Regulation 110.2 as outside the scope of BS 7671. (BS 7671:2018+A2:2022, Regulation 110.2)

30. You are asked to advise on the lightning protection system for a new commercial building. Which standard governs this work, since it falls outside the scope of BS 7671?

  1. BS 7671 Chapter 13
  2. BS EN 62305
  3. BS EN 60898
  4. BS 5839

Lightning protection systems for buildings and structures are excluded from BS 7671 by Regulation 110.2 and are instead covered by BS EN 62305. (BS 7671:2018+A2:2022, Regulation 110.2; BS EN 62305)

31. An electrician is asked to carry out wiring work on the electrical equipment of a sea-going ship. With respect to BS 7671, which statement is correct?

  1. BS 7671 applies in full to ships' electrical equipment
  2. Equipment on board ships is excluded from the scope of BS 7671
  3. BS 7671 applies only to the lighting circuits on ships
  4. BS 7671 applies provided the voltage exceeds 1000 V AC

Regulation 110.2 excludes equipment on board ships, mobile and fixed offshore installations from the scope of BS 7671. (BS 7671:2018+A2:2022, Regulation 110.2)

32. Which of these is excluded from the scope of BS 7671 under Regulation 110.2?

  1. Equipment of motor vehicles
  2. Marinas
  3. Highway equipment
  4. Construction sites

The electrical equipment of motor vehicles is excluded under Regulation 110.2, whereas marinas, highway equipment and construction sites are within the scope under Regulation 110.1.1. (BS 7671:2018+A2:2022, Regulations 110.1.1 and 110.2)

33. Which of the following installations is within the scope of BS 7671 rather than excluded by Regulation 110.2?

  1. Aircraft electrical equipment
  2. Railway signalling equipment
  3. A caravan park electrical distribution system
  4. Equipment of motor vehicles

Caravans and caravan parks are listed in Regulation 110.1.1 as within scope, while aircraft, railway signalling and motor vehicle equipment are excluded by Regulation 110.2. (BS 7671:2018+A2:2022, Regulations 110.1.1 and 110.2)

34. A client lists four jobs. Which one would NOT be covered by the requirements of BS 7671?

  1. Wiring a horticultural greenhouse
  2. Installing power to a marina berth
  3. Installing aircraft on-board electrical equipment
  4. Wiring a temporary supply on a demolition site

Equipment of aircraft is excluded under Regulation 110.2; horticultural premises, marinas and demolition sites are all within scope under Regulation 110.1.1. (BS 7671:2018+A2:2022, Regulations 110.1.1 and 110.2)

35. BS 7671 applies to electrical installations operating at a nominal voltage not exceeding which values?

  1. 230 V AC / 400 V DC
  2. 400 V AC / 600 V DC
  3. 1000 V AC / 1500 V DC
  4. 1500 V AC / 1000 V DC

Regulation 110.1.2 states that the Regulations apply to installations operating at a nominal voltage not exceeding 1000 V AC or 1500 V DC. (BS 7671:2018+A2:2022, Regulation 110.1.2)

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