BS 7671 Practice Paper 6

Conductors shall be identified in accordance with? Mark one answer.

• Section 512

• Section 513

• Section 514

• Section 515

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 27, section 134.1.3
• Amendment 1 (Blue Book) Reference: Page 22 - 134.1.3 - The Part 1 contents, page (Page 14) indicates chapter 134 refers to 'Erection and initial verification of electrical installations' - This is not much use in helping you will find the answer to this question. If you use the Index, page 530 'Conductor - identification' will direct you to section 514, since this is one of the four available answers, this would be a good option to select

BS 7671 may need to be supplemented by the requirements or recommendations of which other document when applied to electric surface heating systems? Mark one answer.

• BS EN 12954

• BS EN 13174

• BS EN 13636

• BS EN 60335-2-96

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 20, section 110.1.3 (vii)
• Amendment 1 (Blue Book) Reference: Page 16 - 110.1.3 (vii) - With this type of question when the words "BS 7671 may need to be supplemented", you need to make a mental note to check Part 1 - Scope - 110.1.3 here you will find the answer 110.1.3 (vii)

BS 7671 includes requirements for? Mark one answer.

• Electric fences installed on farm-land

• Lift installations in office blocks

• Wiring systems and cables not specifically covered by the standards for appliances

• Wiring systems on military aircraft

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 20, section 110.1.2 (iii)
• Amendment 1 (Blue Book) Reference: Page 15 - 110.1.2 (iii) - You won't find any guidance to this answer in the Part 1 contents, page, nor in the Index. Try to remember 110.1.2 advises what is 'included' in BS 7671, and 110.2 (Page 16) advises what is 'excluded'

BS 7671 is? Mark one answer

• Non-statutory and cannot be used as evidence to show compliance, in a court-of-law

• Non-statutory but can be used as evidence to claim compliance with a statutory requirement in a court-of-law

• Statutory and can be used as evidence to show compliance, in a court-of-law

• Statutory and cannot be used as evidence to show compliance, in a court-of-law

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 21, section 114.1
• Amendment 1 (Blue Book) Reference: Page 16 - 114.1 - You shouldn't need to look in the reg's for this answer.

If you didn't know where to look for the answer, then always check out the contents, page for the relevant part of the reg's you are answering, and if there is no obvious pointer to an answer then look in the index section. In this question the Part 1 contents, page indicates section 114 relates to 'Relationship with statutory regulations'

Tip: Remember if you cannot find a particular entry usually in the Contents or Index section, for example 'Initial Verification' look to see if the reverse text exists e.g. 'Verification Initial' you will then often find the solution you are seeking

What is this statement a definition of: 'Protection against electric shock under fault-free conditions'? Mark one answer

• Basic Protection

• Direct contact

• Fault protection

• Indirect contact

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 29 - Definitions for Basic protection
• Amendment 1 (Blue Book) Reference: Page 24 - Definitions - Basic protection - The Definitions Part does include references to deleted definitions, such as 'direct contact'. Basic protection has replaced this term. You should try to remember the definitions for basic and fault protection, as they often come up in the exam, if you selected 'Direct Contact' you would not achieve any marks

Where can further information on Zx be found? Mark one answer.

• Appendix 13

• Appendix 4

• Part 2

• Part 3

Answer explanation

• Amendment 2 (Brown Book) Reference: Correct answer longer applicable as previous version of Appendix 13 - Methods for measurement has been removed and replaced by Escape routes and fire protection

Instead, please look for Floors- insulating, resistance of section 418.1.5 in the Index section.
• Amendment 1 (Blue Book) Reference: Page 41 - Symbols - When symbols such as Zx are used in the regulations, they inform you where the symbol is used for the first time. In the case of Zx, it is in Appendix 13, section 2

Regarding the general supply characteristics, which of the options below is not required to be specified by calculation, determination, measurement, enquiry or inspection? Mark one answer.

• Nature of the current and frequency

• The current-carrying capacities of the cables

• The prospective short-circuit current at the origin of the installation

• The type and rating of the overcurrent protective device

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 55, section 313.1
• Amendment 1 (Blue Book) Reference: Page 49 - 313.1 - The current-carrying capacities of the cables is not a required characteristic. This is one of those 'Reverse' questions. The 'key' to locating this answer is the term 'the general supply characteristics' The part 3 contents, page (Page 44) indicates section 313.1 refers to 'Supplies - General' so this is where you should start looking. For those readers who may think the current-carrying capacity of cables is a potential answer, it would be if this was an appendix question, but it is a part 3 general supply characteristic question. Don't make the mistake of trying to answer a question from one part of the reg's, with what appears to be a suitable answer from another part

EMC regulations are referred to in BS 7671, what does EMC refer to? Mark one answer.

• Earthed Magnetic Compatibility

• Electrical Magnetic Compatibility

• Electromagnetic Compatibility

• Electronic Magnetic Compatibility

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 57, section 332.1
• Amendment 1 (Blue Book) Reference: Page 51 - 332.1 - The part 3 contents, page (Page 44) indicates section 332 refers to 'Electromagnetic Compatibility' browsing to this section on, page 51 you will find the answer in 332.1

To ensure an economic and reliable design, what should be determined? Mark one answer.

• Earthing arrangement

• Maximum cable length

• Maximum demand

• The nature of the current and frequency

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 51, section 311.1
• Amendment 1 (Blue Book) Reference: Page 45 - 311.1 - The part 3 Contents, page (Page 44) provides no help here so look in the Index section, page 532 - 'Design, economic and reliable' and you are directed to section 311.1 - Try to remember any question like this will probably be a 'Maximum Demand and Diversity' question

Which of the following is an assessment of the compatibility of characteristics, of equipment used? Mark one answer.

• Continuity of service

• Maintainability

• Power factor

• Purpose, supplies and structure

Answer explanation

• Amendment 2 (Brown Book) Reference: Page 57, section 331.1 (xii)
• Amendment 1 (Blue Book) Reference: Page 51 - 331.1 (xii) - The part 3 contents, page (Page 44) indicates section 331 refers to 'Compatibility of characteristics' upon turning to this section (Page 51) you will see the list of 'Compatibility of Characteristics' and under 331.1 (xii) you will find 'Power factor'