17th Edition Training Manual

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(1)th 17. Edition. Training Manual  Up to date to Amendment 3  Fully illustrated  Prepare for 2382-15. * not endorsed by City & Guilds.

(2) 17th Edition Training Manual Copyright © 2015 Electacourse, a Clayton Partners Service All rights reserved. No part of this ebook may be reprinted or reproduced or utilised in any form by any electronic, mechanical, or other means now known or hereafter invented, including photocopying and recording, or in any information storage or retrieval system, without permission in writing from the publishers. The single exception to this is the right for the purchaser of this ebook to print pages for their personal study. The reproduction of copies of the material from this ebook in a classroom or training environment is expressly prohibited. Any contravention of these rights is liable to criminal prosecution for piracy under the terms of the Digital Economy Act 2010. ebook published by Electacourse in the United Kingdom The White House, Hunston, Chichester, PO19 1UP www.electacourse.com First publication January 2015 Electacourse catalogue reference: elc100-3 ISBN 13: 978-1-910404-05-8 (ebook-PDF) Also available : 17th Edition 2382-15 Exam Simulator for PC and MAC computers The publisher and author disclaim any liability, in whole or in part, arising from information contained in this publication. The reader is urged to consult with an appropriate licensed professional prior to taking any action or making any interpretation that is within the realm of a licensed professional practice. Trademark notice: Product or corporate names may be trademarks or registered trademarks, and are used only for identification and explanation without intent to infringe. Site licenses and multiple copy purchases for FE colleges and training providers: [email protected].

(3) 17th Edition Training Manual. CONTENTS CONTENTS ............................................................................................................................................................................................................... 2 MODULE 1: BS7671 – REQUIREMENTS FOR ELECTRICAL INSTALLATIONS ....................................................................................................... 8 Why is the 17th Edition important to electricians? ...................................................................................................................................... 8 About this eBook course .................................................................................................................................................................................. 8 What you will learn in this course .................................................................................................................................................................. 9 How this course is organised ........................................................................................................................................................................ 10 ABOUT THE 17TH EDITION ................................................................................................................................................................................... 11 Introduction to the 17th Edition ..................................................................................................................................................................... 11 17th Edition History ......................................................................................................................................................................................... 13 LAYOUT OF THE REGULATIONS ............................................................................................................................................................................ 18 17th Edition Wiring Regulations - Structure ............................................................................................................................................... 18 ABOUT THE 2382-15 EXAM................................................................................................................................................................................... 21 How is the Exam Structured ......................................................................................................................................................................... 22 NUMBERING OF THE 17TH EDITION WIRING REGULATIONS ............................................................................................................................. 25 Numbering ....................................................................................................................................................................................................... 25 MODULE 2: PART 1 - SCOPE, OBJECTIVE & FUNDAMENTAL PRINCIPLES ....................................................................................................... 28 Ch 11 - Scope of the Regulations ................................................................................................................................................................... 29 Ch12 - Objects and effects .............................................................................................................................................................................. 31 Ch13 - Fundamental Principles ..................................................................................................................................................................... 31 REVIEW QUESTIONS – Scope, Object and Fundamental Principles ..................................................................................................... 34 ANSWERS – Scope, Object and Fundamental Principles ......................................................................................................................... 36. © 2008-2015 Electacourse. Page | 2.

(4) 17th Edition Training Manual MODULE 3:PART 2 - DEFINITIONS – NEW AND CHANGED .............................................................................................................................. 37 New definitions and changed definitions ................................................................................................................................................... 37 Definitions ........................................................................................................................................................................................................ 38 Significant regulations new to 17th Edition.................................................................................................................................................. 43 Section summary ............................................................................................................................................................................................. 44 PART 2 - DEFINITIONS - TYPES OF SYSTEM & EARTHING ARRANGEMENTS AND VOLTAGE TERMS ................................................................ 45 Section Objectives ........................................................................................................................................................................................... 45 Earthing Systems ............................................................................................................................................................................................. 45 Definitions Relating to Voltage Terms ......................................................................................................................................................... 47 Voltage bands relating to nominal voltage categories ............................................................................................................................... 47 PART 2 - DEFINITIONS - EXTERNAL INFLUENCE AND INTERNATIONAL PROTECTION CODE (IP CODE) ........................................................ 48 Section Objectives ........................................................................................................................................................................................... 48 External Influence ........................................................................................................................................................................................... 48 International Protection Code ....................................................................................................................................................................... 50 Definitions Summary ..................................................................................................................................................................................... 54 REVIEW QUESTIONS – Definitions ............................................................................................................................................................ 55 ANSWERS – Definitions ................................................................................................................................................................................ 57 MODULE 4 - PART 3 — ASSESSMENT OF GENERAL CHARACTERISTICS .......................................................................................................... 58 Section Overview ............................................................................................................................................................................................ 58 Ch31 -Purpose, Supplies & Structure ........................................................................................................................................................... 59 Ch32 - Classification of External Influences ................................................................................................................................................ 60 Ch33 - Compatibility of Characteristics ....................................................................................................................................................... 61 Ch 35 - Safety Services .................................................................................................................................................................................... 61 Ch 36 - Continuity of Service ......................................................................................................................................................................... 62 REVIEW QUESTIONS – Assessment of General Characteristics ............................................................................................................ 63. © 2008-2015 Electacourse. Page | 3.

(5) 17th Edition Training Manual ANSWERS – Assessment of General Characteristics................................................................................................................................. 65 MODULE 5 - PART 4 — PROTECTION FOR SAFETY............................................................................................................................................ 66 Overview .......................................................................................................................................................................................................... 66 Ch41 - Protection Against Electric Shock .................................................................................................................................................... 66 Chapter 41 - Protection against electric shock ............................................................................................................................................ 74 BS 7671 Appendix 2 section 14 ...................................................................................................................................................................... 75 Ch42 - Protection Against Thermal Effects ................................................................................................................................................. 81 Protection against overheating...................................................................................................................................................................... 85 Ch43 - Protection Against Overcurrent ....................................................................................................................................................... 86 Ch44 - Protection Against Voltage Disturbances & Electromagnetic Disturbances .............................................................................. 93 REVIEW QUESTIONS – Part 4 Protection for Safety ................................................................................................................................ 97 ANSWERS – Protection for safety ................................................................................................................................................................ 99 PART 5 — SELECTION & ERECTION OF EQUIPMENT ......................................................................................................................................... 100 Ch 51 - Common Rules ................................................................................................................................................................................. 101 Ch52 - Selection & Erection of Wiring Systems ........................................................................................................................................ 104 Ch53 - Protection, Isolation, Switching Control and Monitoring .......................................................................................................... 115 Table 53.4 – Guidance on the selection of protective, isolation and switching devices ...................................................................... 117 Ch54 - Earthing Arrangements & Protective Conductors ....................................................................................................................... 122 Earthing arrangements explained .............................................................................................................................................................. 123 Ch55 - Other Equipment .............................................................................................................................................................................. 142 New Section 557 - Auxiliary Circuits ......................................................................................................................................................... 146 Ch56 - Safety services ................................................................................................................................................................................... 152 REVIEW QUESTIONS – Selection and erection of equipment .............................................................................................................. 156 ANSWERS – Selection and erection of equipment .................................................................................................................................. 158 PART 6 — INSPECTION & TESTING .................................................................................................................................................................... 159. © 2008-2015 Electacourse. Page | 4.

(6) 17th Edition Training Manual Overview ........................................................................................................................................................................................................ 159 Ch 61 - Initial Verification ............................................................................................................................................................................ 160 Ch62 - Periodic Inspection & Testing ......................................................................................................................................................... 164 Ch 63 - Certification & Reporting ............................................................................................................................................................... 165 REVIEW QUESTIONS – Inspection and Testing ..................................................................................................................................... 168 ANSWERS – Inspection and Testing.......................................................................................................................................................... 170 MODULE 5 - PART 7 — SPECIAL INSTALLATIONS OR LOCATIONS ................................................................................................................ 171 Overview ........................................................................................................................................................................................................ 171 Section 701 - Locations containing a bath or shower ............................................................................................................................... 172 Section 702 - Swimming Pools & Other Basins ......................................................................................................................................... 178 Section 703 - Rooms & Cabins Containing Sauna Heaters ...................................................................................................................... 182 Section 704 - Construction and Demolition Sites...................................................................................................................................... 184 Section 705 - Agricultural & Horticultural Premises ............................................................................................................................... 187 Section 706 - Conducting Locations with Restricted Movement............................................................................................................ 191 Section 708 - Electrical Installations in Caravan/Camping Parks and Similar Locations ................................................................... 192 Section 709 - Marinas and Similar Locations ............................................................................................................................................ 194 Section 710 - Medical Locations .................................................................................................................................................................. 198 Section 711 - Exhibitions, Shows and Stands ............................................................................................................................................ 203 Section 712 - Solar Photovoltaic (PV) Power Supply Systems ................................................................................................................ 205 Section 714 – Outdoor lighting installations ............................................................................................................................................. 207 Section 715 Extra-low voltage lighting installations ................................................................................................................................ 208 Section 717 - Mobile or Transportable Units ............................................................................................................................................. 210 Section 721 - Electrical Installations in Caravans and Motor Caravans ................................................................................................ 212 Section 722 – Electric Vehicle Charging ..................................................................................................................................................... 216 Section 729 - Operating and Maintenance Gangways ............................................................................................................................. 217. © 2008-2015 Electacourse. Page | 5.

(7) 17th Edition Training Manual Section 740 - Temporary Electrical Installations for Structures, Amusement Devices and Booths at Fairgrounds, Amusement Parks and Circuses ........................................................................................................................................................................................ 219 Section 753 - Floor and Ceiling Heating Systems ..................................................................................................................................... 222 REVIEW QUESTIONS – Special Installations or Locations .................................................................................................................... 224 ANSWERS – Special Installations or Locations ........................................................................................................................................ 226 PART 8 – APPENDICES ........................................................................................................................................................................................ 227 AppendicesOverview ................................................................................................................................................................................... 227 Appendix 1:British Standards Referenced by the Regulations............................................................................................................... 228 Appendix 2: Statutory Regulations and Associated Memoranda .......................................................................................................... 228 Appendix 3:Time / Current Characteristics of Overcurrent Protective Devices and Residual Current Devices ............................ 228 Appendix 4: Current-Carrying Capacity and Voltage Drop for Cables and Flexible Cords ............................................................. 228 Appendix 5: Classification of External Influences.................................................................................................................................... 228 Appendix 6:Model Forms for Certification and Reporting..................................................................................................................... 229 Appendix 7:Harmonized Cable Core Colours .......................................................................................................................................... 229 Appendix 8: Current-Carrying Capacity and Voltage-Drop for Busbar Trunking and Powertrack Systems................................. 229 Appendix 9:Definitions — Multiple Source, D.C. and Other Systems.................................................................................................. 230 Appendix 10: Protection of Conductors in Parallel Against Overcurrent ............................................................................................ 230 Appendix 11:Effect of Harmonic Currents on Balanced Three-Phase Systems ................................................................................... 230 Appendix 12: Volts Drop in Consumers Installations ............................................................................................................................. 230 Appendix 13:Methods for Measuring the Insulation Resistance/Impedance of Floors & Walls to Earth or to the Protective Conductor System ......................................................................................................................................................................................... 230 Appendix 14:Measurement of Earth Fault Loop Impedance: Consideration of the Increase of the Resistance of Conductors with Increase of Temperature .............................................................................................................................................................................. 231 Appendix 16: Devices for protection against overvoltage ...................................................................................................................... 231 REVIEW QUESTIONS – Appendices......................................................................................................................................................... 232. © 2008-2015 Electacourse. Page | 6.

(8) 17th Edition Training Manual ANSWERS – Appendices ............................................................................................................................................................................. 234 CITY & GUILDS 2382-15 SAMPLE EXAM QUESTIONS ......................................................................................................................................... 235 REVIEW QUESTIONS – City & Guilds 2382-15 ....................................................................................................................................... 236 ANSWERS – City & Guilds 2382-15 ........................................................................................................................................................... 248 2382-15 EXAM SIMULATOR ................................................................................................................................................................................ 250 LIST OF ILLUSTRATIONS ...................................................................................................................................................................................... 255 LIST OF TABLES.................................................................................................................................................................................................... 258 WHAT NEXT? ....................................................................................................................................................................................................... 259. © 2008-2015 Electacourse. Page | 7.

(9) 17th Edition Training Manual. MODULE 1: BS7671 – REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. Known as 17th Edition, the IET Wiring Regulations are the British Standards relating to requirements for electrical installations in the UK.. Why is the 17th Edition important to electricians? The 17th Edition is of critical importance to electricians and to all who work in the electrical industry. All new electrical installations need to conform to the requirements of the British Standard 7671:2008 as detailed in the 17th Edition including Amendments 1, 2 and 3, of the requirements. The 17th Edition is the essential source of reference for low voltage electrical installations in the UK. It is the foundation of knowledge for electrical contractors and installers.. © 2008-2015 Electacourse. About this eBook course The aim of this course is to prepare candidates for the City & Guilds 2382-15 examination. An electrician passing the 238215 is known as 17th Edition Qualified and is able to demonstrate a good understanding of the British Standards relating to wiring and electrical installations. All electricians practising in the UK need to know and need to be able to reference the wiring regulations in order to undertake their work to a professional standard.. Page | 8.

(10) 17th Edition Training Manual The 17th Edition Wiring Regulations is not a statutory document. However in the event of a dispute, individuals responsible for faulty installations who are unable to demonstrate understanding of the Regulations, are at risk of assuming legal liability.. 2382-15 Examination. City & Guilds. An open book examination is an assessment which allows candidates to have reference material with them in the exam itself. The exam questions are written on the assumption the candidate has the book alongside them as they answer the questions. For the 2382-15, the reference material is a copy of the 17th Edition Wiring Regulations. You are also allowed to take in a calculator.. City & Guilds are the accrediting institution for assessing individuals’ understanding of the 17th Edition Wiring Regulations.. The 2382-15 examination is a so-called open book examination; it takes take place at accredited City & Guilds examination centres. There is no requirement for any practical work.. You are not allowed to mark up the 17th Edition Wiring Regulations with notes.. What you will learn in this course After you have studied this course you will 1. be familiar with all aspects of the 17th Wiring Regulations 2. know how and where to quickly locate critical information in the 17th Wiring Regulations 3. understand the structure of the 2382-15 exam 4. have had the opportunity to practice exam questions Achievement of the 2382-15 qualification ensures individuals are up-to-date with the latest industry regulations on wiring and the safe use and operation of electrical equipment and systems.. © 2008-2015 Electacourse. You may already have purchased the Electacourse 2382-15 Exam Simulator alongside this course, however if you chose to buy this course alone, you can still buy the simulator separately from electacourse.com.. Page | 9.

(11) 17th Edition Training Manual Many thousands of candidates have used this and the previous versions of the Electacourse 17th Edition course to prepare themselves for the City & Guilds 2382-15 exam. Feedback indicates that Electacourse candidates tend to pass the 2382-15 exam with higher marks than those who have studied at training centres.. How this course is organised Like many courses and eBooks, the 17th Edition Wiring Regulations course is organised both as a linear course and as a reference where you can dip in and out of modules, chapters or sections. It is not a requirement that you have to complete one module before moving on to the next. If you feel confident about one chapter, then you have the choice to skip it and move on to another. We recommend however, that you do review all chapters. The course is organised into 5 Modules, each module contains a number of chapters or parts. The first module introduces the background to the 17th Edition, the nature of the exam and how the Regulations are organised. The other four modules align closely to the parts which make up the general structure of the 17th Edition Wiring Regulations. Within each part, there are chapters, some of which are split into sections. Each chapter covers a discrete, bite size set of the Regulations. We recommend you study one chapter at a time and once you have completed a chapter, take a break. If you wish you can study more than one chapter a day. Some of the chapters, particularly in Module 1 are quite short. But if you do take more than one chapter at a time,. © 2008-2015 Electacourse. avoid extending yourself. Too much time spent studying can lead to lack of a concentration and prevents good learning of the information contained in each chapter. Most modules conclude with a small quiz to test your understanding of the material which was covered in the section. At the end of the course is a longer quiz which tests your understanding of the complete 17th Edition Regulations. The Modules are. Module 1 – Introduction Introduces the aims of the course and what you may expect to achieve from studying the course Module 2 – Part 1 – Scope, Objective and Fundamental Principles This short module introduces the scope and aims of the Regulations. Module 3 – Definitions The Regulations contain hundreds of definitions. Knowledge of the definitions assists understanding of the Regulations Module 4 – Parts 3, 4, 5 and 6 These Parts contain the body of the Regulations. It is essential to be able to go quickly to any chapter or section within these Parts. Module 5 – Part 7 and Appendices Part 7 covers special installations or locations. Page | 10.

(12) 17th Edition Training Manual. ABOUT THE 17TH EDITION. Introduction to the 17th Edition The 17th Edition Wiring Regulations is a big book: it is over 450 pages long and covers thousands of regulations. Some courses try to teach this material using videos, animations and other multi-media methods. Although such media can help students understand the principles of the wiring regulations, on their own they are not sufficient to get under the skin of the Regulations. There is more information to be understood and learnt than can be taught in a series of slide presentations or video clips. Also, as the exam is open book and is designed to test your understanding of how to find out information about the regulations which cover your day. © 2008-2015 Electacourse. to day work, no amount of entertaining voice-overs or animations is going to help you get to know your way round the densely packed 17th Edition Wiring Regulations. This course is designed to draw your attention to the critical areas of the Regulations, to indicate what has changed in the 17th Edition and to prepare you for the exam. You will complete the course secure in the knowledge you know how to locate and apply relevant regulations in your daily work. This secure knowledge will give you the best chance of achieving a good pass at the 2382-15 examination. Unlike courses which are undertaken over a few intense days at a training centre, this course gives you the. Page | 11.

(13) 17th Edition Training Manual opportunity to study at your own pace and in your time to give you the best opportunity of understanding the Regulations and to passing the 2382-15 exam. If you do not already have a copy of the 17th Edition Wiring Regulations Yellow Book, then you need to buy one now. Click here or on the Yellow Book to go to Amazon.co.uk.. Fig. 1 The IET, publisher of the Wiring Regulations. Fig. 2 17th Edition Wiring Regulations, you can purchase the book new or second hand from Amazon. If you buy it second hand, make sure it does not have any pencil or pen markings inside.. © 2008-2015 Electacourse. Page | 12.

(14) 17th Edition Training Manual 17th Edition History. Fig. 3 The first electric street lamps in the UK. In 1881 the first public electricity supply in the world was turned on in Godalming in Surrey, where gas street lights were replaced by electrical street lamps based on a system supplied by the German company Siemens. No sooner had the system been activated than the technical press reported issues associated with wiring. The lighting in side streets was dim and of poor quality due to the inadequacy of the cabling. There were also reports of children (and drunks) harming themselves on the exposed wires.. © 2008-2015 Electacourse. Page | 13.

(15) 17th Edition Training Manual In the next year, the first edition of the British Wiring regulations was published. It was published by the Society of Telegraph Engineers and of Electricians and contained just four pages under the title Rules and Regulations for the Prevention of Fire Risks Arising from Electric Lighting. The purpose of the Regulations were to ensure that workmanship was of the highest order and that the materials used are of suitable quality to do the work required and that the installations were safe. We think the first regulations are so interesting, we have reproduced them in full at the end of this module. Courtesy of the IET. The wiring regulations remained the responsibility of what became the Institute of Electrical Engineers (and later. © 2008-2015 Electacourse. became IET) and in 1981 became aligned to IEC (International Electrotechnical Commission) standards. Eleven years later, the regulations became a British Standards document and the harmonisation of wiring regulations became formalised. Further international harmonisation of standards aligns wiring regulations to CENELEC (European Committee for Electrotechnical Standardization) The most recent edition of the wiring regulations is the 17th Edition which was published in June 2008 as BS7671:2008. In July 2011, Amendment 1 to the regulations was published under a green cover and came into force in January 2012. In 2013 a Corrigendum and Amendment 2 covering electric vehicles were published.. Page | 14.

(16) 17th Edition Training Manual A major amendment, Amendment 3 was published in January 2105. This amendment included many changes. which are applicable from 1st July 2105. This course is up to date to Amendment 3.. Time line of the publication of the 17th Edition of the Wiring Regulations. © 2008-2015 Electacourse. Page | 15.

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(19) 17th Edition Training Manual. LAYOUT OF THE REGULATIONS. The 17th Edition Wiring Regulations are organised in to a structure containing 7 Parts and the Appendices. 17th Edition Wiring Regulations - Structure. . Key fact. Each part contains a chapter, each chapter contains sections, each section contains regulations. The Regulations themselves may contain multiple clauses. The Regulations is a well organised but complex document. The 17th Edition Wiring Regulations contains seven parts. © 2008-2015 Electacourse. and sixteen appendices. Within this structure there are many thousands of regulations which although you are not expected to know by heart, you are expected to know where to find relevant regulations. The core of the regulations is Part 3 to Part 7. Around these core specialist parts is the introductory Part 1, the Definitions which apply to all parts, Part 2, and the 16 Appendices which contain detailed regulatory information, tables and measurements. The Regulations themselves are contained with Sections and Chapters of the Parts of the 17th Edition. Page | 18.

(20) 17th Edition Training Manual The 16 Appendices Of The 17th Edition Wiring Regulations • • • • • • • • • Fig. 4 Basic structure of the Regulations. The 7 Parts Of The 17th Edition Wiring Regulations Part 1. Scope, object and fundamental principles. Part 2. Definitions. Part 3. Assessment of general characteristics. Part 4. Protection for safety. Part 5. Selection and erection of equipment. Part 6. Inspection and testing. Part 7. Special installations or locations. • • • •. •. • •. © 2008-2015 Electacourse. British Standards to which reference is made in the Regulations Statutory regulations and associated memoranda Time/current characteristics of overcurrent protective devices and RCDs" Current-carrying capacity and voltage drop for cables Classification of external influences Model forms for certification and reporting Harmonized cable core colours Current-carrying capacity and voltage drop for busbar trunking and powertrack systems Definitions – multiple source, d.c. and other systems Protection of conductors in parallel against overcurrent Effect of harmonic currents on ... Moved to Appendix 4 sec 5.5 and 5.6 Voltage drop in consumers’ installations…Moved Appendix 4 sec 6.4 Methods for measuring the insulation resistance/impedance of floors and walls to Earth or to the protective conductor system Measurement of earth fault loop impedance: consideration of the increase of the resistance of conductors with increase of temperature Ring and radial final circuit arrangements, Regulation 433.1 Devices for protection against overvoltage. Page | 19.

(21) 17th Edition Training Manual *Note that following the update BS7671:2008 Amendment 1 in 2011, two of the appendices, 11 and 12, have been moved to Appendix 4. In effect this means there are in fact only fourteen appendices which contain information. Appendices 11 and 12 remain in the 17th Edition Wiring Regulations for information purposes.. Fig. 5 Structure of the 17th Edition Wiring Regulations. Understanding the Structure of the Regulations. Although there are 7 parts and 16 Appendices, the 17th Edition Wiring Regulations can best be understood by considering it as organised into four chunks of information: 1. Part 1- Scope, object and fundamental principles This section outlines general requirements for installations 2. Part 2 – Definitions This section details the 290 definitions which are used in the Regulations 3. Part 3 to Part 7 This is the body of the regulations, each part deals with a critical area of wiring regulations. Parts 3 to 6 describe general regulations in details and the longest part, Part 7 deals with special installations and locations. 4. Appendices The extensive appendices provide detail information related to the Wiring Regulations. © 2008-2015 Electacourse. Page | 20.

(22) 17th Edition Training Manual. ABOUT THE 2382-15 EXAM. Fig. 6The 2382-15 exam is set and administered by City & Guilds.. The 2382-15 is available at exam centres around the UK. City & Guilds assess a requirement that candidates undertake at least 35 study hours prior to sitting the exam. The 2382-15 exam is an ‘open book’ exam. That means candidates can take into the exam room a copy of the 17th Edition Wiring Regulations (the Yellow Book). You can also take in a calculator. You are not allowed to mark up the Green Book with written notes; it needs to be a ‘clean’ copy.. © 2008-2015 Electacourse. At the examination centre candidates sit the exam at a computer which is connected online with the City & Guilds. In most cases the exam centre will be able to give candidates information about how well they have performed in the exam within 30 minutes of completing the exam. All the exam questions are of the multiple choice type; that is, one. . Top tip. Become familiar with the index of the Regulations. In your exam the quickest way to find your way around the Yellow Book is to start with the index. The index is your friend.. Page | 21.

(23) 17th Edition Training Manual question statement with four possible answers of which one is correct. When studying this course and preparing for the 2382 exam it is important that candidates understand that the exam is not only testing your understanding of the 17th Edition Wiring Regulations, it is testing your knowledge of the. Green Book and your ability to locate in the book answers to the exam questions. So, do not try to remember everything in this course, but do remember how to use this information to find the relevant sections from the 17th Edition Wiring Regulations.. How is the Exam Structured The following gives detailed weighting information for the 17th Edition 2382-15 exam at the time of publication. You do not need to learn the weighting, but it serves as a very good indication as to what information you will need to retrieve from the 17th Edition Wiring Regulations in order to pass your exam.. Fig. 7 The number and percentage of questions for each section of the 2382-15 exam. © 2008-2015 Electacourse. Page | 22.

(24) 17th Edition Training Manual Part 1 - Understanding Scope, Object and Fundamental Principles Weighting - 6% Number of questions – 4. For this part of the exam you need to refer to all Parts of the Regulations, but of particular importance are: 1) Identify examples of installations in the Scope of BS 7671:2008 and particular requirement for specific installations and locations. 2) Identify the object of BS 7671: 2008. 3) Identify the fundamental principles of BS7671. Part 2 – Definitions. Weighting - 4% Number of questions – 2 Refer to Part 2 of the 17th Edition Wiring Regulations 1) Interpret the definitions used within BS7671 2) Relate the definitions to the regulations and appendices of BS7671 Although this Part has a small weighting towards the 238215 exam and only two questions, a clear understanding of the Definitions Part of the Regulations will help considerably when working through questions relating to the other Parts of the regulations. You will find that becoming familiar with the ‘System’ definition will specifically help you when sitting the 2382-15 exam.. © 2008-2015 Electacourse. Part 3 – Understand how to assess the general characteristics of electrical installations Weighting - 10% Number of questions – 6. Please refer to the relevant parts of the regulations and:. 1) Interpret the requirements of assessing the general characteristics of electrical installations within the scope of BS7671 2) You should be able to state the need to consider compatibility and maintainability in the selection of equipment and the need to divide an installation into suitable circuit arrangements. 3) Determine the number and types of Live conductors for installation circuits and state the source (e.g. standby, external) and characteristics necessary for a supply.. Part 4 – Understand the requirements for protection for safety for electrical installations Weighting - 25% Number of questions – 15. Please refer to the relevant parts of the regulations and:. 1) Identify the requirements of protection for safety within the scope of BS7671 2) Identify how this applies to the electrical installations within the scope of BS7671, including: 3) Protection against electric shock 4) Protection against thermal effects 5) Protection against overcurrent 6) Protection against electromagnetic and voltage disturbances 7) Describe how the requirements for shock protection are. Page | 23.

(25) 17th Edition Training Manual affected by: a) Value of external earth loop Impedance (Ze) b) Compliance with Zs=R1 + R2 + Ze c) Compliance with tables 41.2-6 8) Describe means of protection against fire, burns and harmful thermal effects. 9) Identify the difference between overcurrent and fault current 10) Describe methods of overcurrent and fault current protection and the need for coordination with conductors and equipment. 11) State the requirements for protection against a) Overvoltage b) Undervoltage 12) Identify precautions where particular risk of danger of fire exists.. Part 5 – Understand the requirements for selection and erection of equipment for electrical installations Weighting — 23% Number of questions — 14. Please refer to the relevant parts of the regulations and:. 1) Identify the requirements for selecting and erecting equipment within the scope of BS7671 2) Interpret how this applies to electrical installations, including: 3) Common rules 4) Selection and erection of wiring systems 5) Protection, isolation, switching, control and. © 2008-2015 Electacourse. 6) 7) 8) 9). Monitoring Earthing arrangements and protective conductors Other equipment including Auxiliary circuits Safety services. Part 6 – Understand the requirements for inspection and testing of electrical installations Weighting — 7% Number of questions — 4. Please refer to the relevant parts of the regulations and:. 1) Identify the requirements for inspection and testing of electrical installations. 2) Interpret how this applies to electrical installations.. Part 7 – Understand the requirements of special installations or locations as identified in BS7671 Weighting — 17% Number of questions — 10. Please refer to the relevant parts of the regulations and: 1) Identify the requirements for special installations and locations. 2) Interpret how these affect the general requirements of the regulations.. Appendix – Understand the information contained within the appendices of BS7671 Weighting — 8% Number of questions — 5. 1) Identify the information in the appendices of BS7671. 2) Specify how the information contained in the appendices is used to support electrical installation activities.. Page | 24.

(26) 17th Edition Training Manual. NUMBERING OF THE 17TH EDITION WIRING REGULATIONS. The aim of this section is to give you an understanding of the numbering system which is used in the 17th Edition Wiring Regulations. Understanding of the numbering system enables you to quickly locate the relevant regulations and gives guidance on how to work your way through the exam and the 17th Edition Wiring Regulations. Numbering The numbering of the 17th Edition Wiring Regulations follows the pattern of the technical intent of Standards developed at the European CENELEC level. The system is based on the harmonisation documents HD60364 series of standards. Or, in language the rest of us understand, the numbering system has designed to be consistent, easy to follow and easy to update. For the old timers amongst us who wired our first socket under the 16th Edition Regulations, the most obvious change is that the 17th Edition Wiring Regulations has dropped the dashes and now uses a point/dot numbering system, based on the IEC numbering system.. © 2008-2015 Electacourse. Page | 25.

(27) 17th Edition Training Manual The structure of the numbering is straightforward:. Regulation 524.1 Refers to:. 1st digit still signifies a Part (Part 5 of BS 7671 in the. PART 5 - SELECTION AND ERECTION OF EQUIPMENT. example below),. CHAPTER 2 - SELECTION AND ERECTION OF WIRING SYSTEMS. 2nd digit is a Chapter (the second chapter of Part 5), 3rd digit is a Section (the fourth section of 52) The subsequent number/s are the Regulation (or group of Regulation) number/s (1 of 524). SECTION 4 - CROSS-SECTIONAL AREAS OF CONDUCTORS REGULATION 1. Using the example of Regulation 524.1. The cross-sectional area of each conductor in a circuit shall be not less than the values given in Table 52.3, except as provided for extra-low voltage lighting installations according to Regulation 559.11.5.2.. Some regulations are organized into Regulation Groups, by example:Regulation 521.9.3 refers to:. REGULATION- GROUP 9Use of flexible cables. PART 5 - SELECTION AND ERECTION OF EQUIPMENT. Stationary equipment which is moved temporarily for the purposes of connecting, cleaning etc., e.g. cookers or flush mounting units for installations in false floors, shall be connected with flexible cable. If the equipment is not subject to vibration then non-flexible cables may be used.. CHAPTER 2 - SELECTION AND ERECTION OF WIRING SYSTEMS SECTION 1 - TYPES OF WIRING SYSTEM. © 2008-2015 Electacourse. REGULATION 3. Page | 26.

(28) 17th Edition Training Manual UK Only Numbering. The 17th edition introduced a new IEC decimal point numbering system to make it easier to embody future changes and additions resulting from ongoing international standards work within IEC and CENELEC. In order to accommodate future IEC changes it was decided to have a 100 numbering system for UK only regulations. For the third amendment, the 100 numbers now represent CENELEC Harmonization Document reference numbers and 200 numbers represent UK-only regulations. Existing regulations have not been "updated" to indicate 100 and 200 numbers; that will only be done when those regulations require a significant rewrite.. Fig. 8 Page of the Regulations showing ‘dot’ numbering. © 2008-2015 Electacourse. Page | 27.

(29) 17th Edition Training Manual. MODULE 2: PART 1 - SCOPE, OBJECTIVE & FUNDAMENTAL PRINCIPLES. The aim of this chapter is to give an understanding of Part 1 of the Regulations, you will learn which are the critical elements of Part 1 Part 1 serves as an introduction to the regulations and outlines very general guidelines for the requirements for installations. This first Part is not as exacting as the rest of the regulations, but it lays a very good foundation for the way that all installers and designers should think.. The chapters included in Part 1 are Ch 11. Scope - Range and exclusions of installation. Ch 12. Objects and effects - Materials, precautions. and effects standards Ch 13. Fundamental principles - Workmanship,. overcurrent, earth leakage, isolation and switching, inspection and testing. © 2008-2015 Electacourse. Page | 28.

(30) 17th Edition Training Manual Ch 11 - Scope of the Regulations Within the scope of the Regulations The Scope of the regulations apply to the design, erection and verification of electrical installations, such as those of: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.. Residential premises Commercial premises Public premises Industrial premises Agricultural and horticultural premises Prefabricated buildings Caravans, caravan parks, and similar sites Construction sites, exhibitions, shows, fairgrounds and other Installations for temporary purposes Marinas External lighting and similar installations Mobile or transportable units Photovoltaic systems Low Voltage generating sets Highway equipment and street furniture Medical locations Operating and maintenance gangways. © 2008-2015 Electacourse. 110.1.2 Additional requirements are included in the regulations for: 1. Circuits supplied at nominal voltages up to and including 1000 VAC or 1500 VDC; for AC, the preferred frequencies, which are taken into account in this Standard are 50 Hz, 60 Hz and 400 Hz. The use of other frequencies for special purposes is not excluded: 2. Circuits, other than the internal wiring of apparatus, operating at voltages exceeding 1000V and derived from an installation having a voltage not exceeding 1000 VAC. e.g. Discharge lighting. 3. Wiring systems and cables not specifically covered by the standards for appliances 4. All consumer installations external to buildings 5. Fixed wiring for information and communication technology, signalling, control and the like 6. Additions and alterations to installations and parts of the existing installation affected by an addition or alteration.. Page | 29.

(31) 17th Edition Training Manual Outside the scope of the Regulations. Installations that are excluded from BS 7671: 2008: 1. Distributor ’s equipment as defined in the Electricity Safety, Quality and Continuity Regulations 2002 2. Railway traction equipment, rolling stock and signalling equipment 3. Equipment of motor vehicles, except those to which the requirements of the Regulations concerning caravans or mobile units are applicable 4. Equipment on board ships 5. Equipment of mobile and fixed offshore installations 6. Equipment of aircraft 7. Those aspects of mines and quarries specifically covered by Statutory Regulations 8. Radio interference suppression equipment, except so far as it affects safety of the electrical installation 9. Lightning protection of buildings covered by BS 6651 10. Those aspects of lift installations covered by BS 5655 and BS EN 81-1 11. Electrical equipment of machines 12. Electric fences. Fig. 9 Outside scope of Regulations. © 2008-2015 Electacourse. Page | 30.

(32) 17th Edition Training Manual Statutory Control & Installation Requirements. electrician to know and every part, while not specific, should be fully understood; it is the foundation for all other requirements. However, when sitting the 2382-15, do not rely on referencing Chapter 13, in nearly all cases, the questions you will be asked will require you to refer to the regulations in the detailed Parts and Chapters.. Part 1, Chapter 11, Section 115 states that for installations in premises over which a licensing or other authority exercises a statutory control, the requirements of that authority shall be ascertained and complied with in the design and execution of the installation.. Chapter 13 and BS7671 in general, exists to provide for the safety of persons, livestock and property against dangers and damage which may arise in the reasonable use of electrical installations.. Ch12 - Objects and effects. Risk of injury can arise from:. In general, the Regulations are non-statutory; however, they can be used as evidence to claim compliance with a statutory requirement. The statutory requirements that the BS 7671 support are listed in Appendix 2 of the Regulations, according to their application.. This is a short chapter which is unlikely to prompt any questions in 2382-15. This chapter introduces the structure of the rest of the Regulations. It does contain the important note that if the designer deviates from any part of the Regulations, the resulting degree of safety is not less than that obtained by compliance with the Regulations.. Ch13 - Fundamental Principles Although the regulations relating to Protection for Safety are detailed in Part 4, this chapter, Chapter 13 states the fundamental principles relating to protection for safety, design, selection, erection and verification of electrical installations. All the principles covered in this chapter will be repeated at relevant sections later on. This duplication matches the duplication in the Regulations. Chapter 13 is a broad but very crucial chapter to for an. © 2008-2015 Electacourse. 131.1 General - Risk of injury. 1. Shock currents A person or livestock can be protected against shock by direct contact, by limiting the current which can pass through a body to a non-hazardous value. Fault protection can also protect against shock by limiting the magnitude of a current to a nonhazardous value, and by limiting the duration of the current to a non-hazardous time period. The method of equipotential bonding is an important principle for protection for safety. Note that the definition for ‘direct contact’ has been deleted by BS7671:2008 and is now covered by the ‘basic protection’ definition. 2. Excessive temperatures likely to cause burns and fires To protect against thermal effects, the installation must be arranged that the risk of ignition of flammable materials is minimized. The factors of. Page | 31.

(33) 17th Edition Training Manual. 3. 4.. 5. 6.. 7.. combustion, ignition, or degradation of materials, risk of burns, and impairment of the safe function of installed equipment should be taken into consideration. Ignition of potentially explosive atmosphere Undervoltages, overvoltages and electromagnetic influences likely to cause or result in injury or damage Personnel and livestock should be protected against effects of a fault between live parts of circuits supplied at different voltages and atmospheric events. In addition, protection must be provided for undervoltage and the subsequent recovery. When installed, there should be an adequate level of immunity against electromagnetic disturbances by taking into consideration electromagnetic emissions that the installation will produce. Mechanical movement of electrically actuated equipment therefore causing injury Power supply interruptions of safety services When damage or danger is expected to arise due to an interruption of supply, suitable provisions shall be made in the installation or installed equipment. Arcing, likely to cause blinding effects, excessive pressure, and/or toxic gases. 132 Installation Design. The installation should be designed for the protection of persons, livestock and property and for the proper functioning of the installation for intended use.. © 2008-2015 Electacourse. The following characteristics should be included in the documentation to show conformity with the Regulations. This section has been the source of exam questions. •. Nature of current (AC / DC). •. Purpose and number of conductors:. •. For AC: Line conductors, neutral conductors, protective conductor, PEN conductors. •. For DC: Conductors equivalent to those listed above (outer/middle/earthed live conductors, protective conductor, PEN conductor). •. Values and tolerances:. •. Nominal voltage and voltage tolerances. •. Nominal frequency and frequency tolerances. •. Maximum current allowable. •. Earth-fault loop impedance. •. Protective measures inherent in the supply (earthed neutral of mid-wire). •. Particular requirements of the distributor.. •. The nature of the demand should be determined from knowledge of:. •. Location of points of power demand. •. Loads to be expected on the various circuits. •. Daily and yearly variation of the demand. •. Harmonics and any other special conditions. •. Anticipated future demand. •. Requirements for control, signalling,. Page | 32.

(34) 17th Edition Training Manual communication and information technology •. If a supply for safety services is specified, the following should be determined:. •. Source of supply. •. Circuits to be supplied by the electrical source for. electrical installation. When the installation is complete, a qualified individual should inspect and verify the installation's completion. They should also make a recommendation for subsequent periodic inspection and testing.. safety services or the standby electrical source Equipment exposed to the environment should be protected to prevent dangerous conditions. The cross-sectional area of conductors, the type of wiring and method of installation, and protective equipment should all be factors in the design with respect to both normal current loads and fault current loads. If a possibility of danger exists that would require immediate interruption of the supply of power, an interrupting device should be installed. Accessibility should be a factor for installation and repair, as well as disconnecting devices. All documentation should be supplied with the electrical device upon installation. A single-pole fuse, switch or circuit breaker shall be inserted in the line conductor only. NEVER should a switch, fuse or circuit breaker be inserted in an earthed neutral conductor. When selecting electrical equipment, compliance with the appropriate British Standard is mandatory. In addition, the voltage, current, frequency and power should all comply with the circuit's needs and capacities. At all times, good workmanship by skilled persons and proper materials should be used in the erection of the. © 2008-2015 Electacourse. Page | 33.

(35) 17th Edition Training Manual REVIEW QUESTIONS – Scope, Object and Fundamental Principles. Question 1. Question 3. BS7671 Wiring Regulations do NOT apply to the design, erection and verification of:. BS7671 Wiring Regulations apply to the design, erection and verification of:. A.. public premises. A.. Equipment of mobile and fixed offshore installations. B.. photovoltaic systems. B.. Marinas. C.. equipment on board ships covered by BS 8450. C.. D.. external lighting and similar installations. Railway traction equipment, rolling stock and signalling equipment. D.. Electric fences covered by BS EN 60335-2-76.. Question 2 BS7671 Wiring Regulations do NOT apply to the design, erection and verification of:. Question 4. A.. low voltage generating sets. BS7671 Wiring Regulations may need to be supplemented by the requirements or recommendations of other standards in cases where they are applied to:. B.. public premises. A.. operating and maintenance gangways.. C.. prefabricated buildings. B.. low voltage generating sets. D.. aircraft equipment. C.. mobile or transportable units. D.. electrical installations for open-cast mines and quarries. © 2008-2015 Electacourse. Page | 34.

(36) 17th Edition Training Manual Question 5. Question 7. One of the important principles for safety in connection with fault protection is the application of the method of. An interrupting device for emergency control shall be installed. A.. protective insulation. A.. B.. protective equipotential bonding. in such a way that it can be rapidly and effectively operated. C.. protective connection. B.. D.. equipotential insulation. in such a way that it can be easily recognized and effectively and rapidly operated for immediate interruption of the supply. Question 6. C.. closer to the power supply. Which characteristic does not need to be included in the documentation referred to in Regulation 132.13 to show conformity with the Regulations:. D.. in such a way that it can be easily recognized. A.. Particular requirements of the distributor.. B.. Nature of current: a.c. and/or d.c.. When equipment is not covered by a known standard, the designer must confirm the same degree of safety as afforded by. C.. The cost of equipment. A.. European standards. D.. Purpose and number of conductors. B.. British standards. C.. CENELEC standards. D.. IEC standards. © 2008-2015 Electacourse. Question 8. Page | 35.

(37) 17th Edition Training Manual Question 9. Question 10. The IET Requirements for Electrical Installations BS7671 applies for. The fundamental principles of BS 7671 covering design, states that every electrical installation shall be provided with. A.. electrical equipment on aircraft. A.. emergency control devices. B.. traction equipment. B.. fuses in the neutral conductor. C.. construction sites. C.. an alternative source of supply. D.. fire alarms fed from a safety source. D.. appropriate documentation. ANSWERS – Scope, Object and Fundamental Principles 1C, Ref: BS7671: 110.1.1, 110.2 2D, Ref: BS7671: 110.1.1, 110.2 3B, Ref: BS7671: 110.1.1, 110.2 4D, Ref: BS7671: 110.1.3 5B, Ref: BS7671: 131.2.2 6C, Ref: BS7671: 132.2 7B, Ref: BS7671: 132.9 8B, Ref: BS7671: 110.1.3 9C, Ref: BS7671: 110.1.1 10D, Ref: BS7671: 132.13. © 2008-2015 Electacourse. Page | 36.

(38) 17th Edition Training Manual. MODULE 3:PART 2 - DEFINITIONS – NEW AND CHANGED. New definitions and changed definitions The aim of this chapter is to draw attention to the many new definitions which are described in the 17th Edition Wiring Regulations. Some existing definitions have new words and descriptions. There are over 300 definitions in the 17th Edition Wiring Regulations, Amendment 3 — there were 170 in the 16th Edition. Some new definitions came in to the Regulations at the time of the first publication of the 17th Edition, others have been introduced more recently with the publication of © 2008-2015 Electacourse. Amendments 2 and 3. As with the previous chapter, this chapter introduces concepts which will be repeated later in the relevant Parts. This duplication is intentional; we aim to illustrate how the Regulations are structured. Itemised below is a complete list of all the Definitions, those that have been introduced in Amendment 3 are highlighted. Extended descriptions of significant new and changed definitions are detailed later in this section.. Page | 37.

(39) 17th Edition Training Manual Definitions (New or significantly changed in Amendment 3 marked in RED 8/20 Current impulse, {534}.. Building void, non-accessible.. Accessory.. Bunched.. Central power supply system (low power output).. Agricultural and horticultural premises.xx. Busbar trunking system. Circuit. Circuit-breaker.. Ambient temperature. Bypass equipotential bonding conductor, {444}.. Amusement device.. Cable channel.. Circuit protective conductor (cpc).. Appliance.. Cable cleat.. Class I equipment.. Arm’s reach.. Cable coupler.. Class II equipment.. Arrangements for livestock keeping.. Cable ducting.. Class III equipment.. Auxiliary circuit.. Cable ladder.. Cold tail.. Back-up protection.. Cable tray.. Barrier.. Cable trunking.. Basic insulation.. Cable tunnel.. Common equipotential bonding system, common bonding network (CBN), {444}.. Basic protection.. Caravan.. Basin of fountain.. Caravan park / camping park.. Conducting location with restricted movement.. Bonding conductor.. Caravan pitch.. Conduit.. Bonding network (BN), {444}.. Connector.. Bonding ring conductor (BRC), {444}.. Caravan pitch electrical supply equipment.. Booth. Cartridge fuse link.. Building void, accessible.. Central power supply system.. © 2008-2015 Electacourse. Circuit-breaker, linked.. Complementary floor heating.. Consumer unit (may also be known as a consumer control unit or electricity control unit).. Page | 38.

(40) 17th Edition Training Manual Continuous operating voltage (Uc),{534}.. Earth electrode resistance.. Controlgear. Earth fault loop impedance.. Conventional impulse withstand voltage.. Earth leakage current. Current-carrying capacity of a conductor.. Earthing.. Earth fault current.. Earthed concentric wiring.. Electrical supply system for safety services. Electrically independent earth electrodes. Electrode boiler (or electrode water heater).. Current-using equipment.. Earthing conductor.. Electronic convertor (static convertor).. d.c. system. Electric shock.. Emergency stopping.. Danger.. Electric vehicle (EV), {722}.. Emergency switching.. Electric vehicle charging point.. Enclosure.. Mode 1 charging.. Equipotential bonding.. Direct heating system.. Mode 2 charging.. Escape route.. Disconnector.. Mode 3 charging.. Exhibition.. Discrimination.. Mode 4 charging.. Exposed-conductive-part.. Distribution board.. Vehicle connector.. External influence.. Distribution circuit.. Vehicle coupler.. Extra-low voltage. Design current (of a circuit). Device for connecting a luminaire (DCL).. Equipment. Distributor.. Electrical circuit for safety services.. Extraneous-conductive-part.. Double insulation.. Electrical equipment (abbr: Equipment).. Fairground.. Earth.. Electrical installation (abbr: Installation).. Fault current.. Earth electrode.. Electrical source for safety services.. Duct, Ducting. Earth electrode network, {444}. © 2008-2015 Electacourse. Fault. Fault protection. Final circuit. Page | 39.

(41) 17th Edition Training Manual Fixed equipment.. Highway.. Flexible cable.. Highway distribution board.. Low voltage switchgear and controlgear assembly.. Flexible sheet heating element.. Highway distribution circuit.. Luminaire.. Flexible wiring system.. Highway power supply.. Luminaire supporting coupler (LSC).. Follow-current interrupting rating, {534}.. Houseboat. Main earthing terminal.. Impulse current (Iimp), {534}.. Maintenance.. Functional bonding conductor, {444}.. Impulse withstand voltage, {534}.. Marina.. Functional earth.. Inspection.. Mechanical maintenance.. Functional extra-low voltage (FELV).. Installation.. Medical location, {710}.. Functional switching.. Instructed person (electrically).. Applied part.. Fuse.. Insulation.. Group 0.. Fuse carrier.. Insulation co-ordination, {534}.. Group 1.. Fuse element.. Isolation.. Group 2.. Fuse link.. Isolator.. Fused connection unit.. Ladder. Medical electrical equipment (ME equipment).. Gas installation pipe.. Leakage current.. Harmonized Standard.. Medical electrical system (ME system).. Leisure accommodation vehicle.. Hazardous-live-part.. Medical IT system.. Heating cable.. Lightning protection zone (LPZ), {534}.. Patient.. Heating-free area.. Line conductor.. Heating unit.. Live conductor.. Meshed bonding network (MESHBN), {444}.. High-density livestock rearing.. Live part.. Minimum illuminance.. High voltage. Low voltage. Minor works.. © 2008-2015 Electacourse. Patient environment.. Page | 40.

(42) 17th Edition Training Manual Mobile and offshore installations.. PEM.. PV array junction box.. Mobile equipment. PEN conductor.. PV cell.. Mobile home.. Person. PV convertor.. Monitoring.. Phase conductor. PV d.c. main cable.. Motor caravan.. Pleasure craft.. PV generator.. Neutral conductor.. Plug.. PV generator junction box.. Nominal discharge current (Inspd), {534}.. Point (in wiring).. PV installation.. Portable equipment. PV module.. Nominal voltage. Powertrack.. PV string.. Non-flame propagating.. Powertrack system (PT system).. PV string cable.. Obstacle.. Prefabricated wiring system.. PV supply cable.. Open-circuit voltage under standard test conditions Uoc STC.. Prospective fault current (Ipf).. Rated current.. Operating and maintenance gangway, {729}.. Protective bonding conductor. Protective conductor (PE).. Rated impulse withstand voltage level (Uw), {534}.. Ordinary person.. Protective conductor current.. Reduced low voltage system.. Origin of an installation.. Protective earthing.. Reinforced insulation.. Origin of a temporary electrical installation.. Protective equipotential bonding.. Reporting.. Protective multiple earthing (PME).. Overcurrent.. Protective separation.. Residences and other locations belonging to agricultural and horticultural premises.. Overcurrent detection.. PV, {712}.. Residential park home.. Overload current.. PV a.c. module.. Residual current.. PEL.. PV array.. Residual current device (RCD).. PELV (protective extra-low voltage).. PV array cable.. © 2008-2015 Electacourse. Page | 41.

(43) 17th Edition Training Manual Residual operating current.. Standby electrical source.. Resistance area (for an earth electrode only).. Standby electrical supply system.. Temporary overvoltage (UTOV), {534}.. Static convertor.. Temporary structure.. Response time.. Stationary equipment.. Temporary supply unit.. Restrictive conductive location.. Street furniture.. Testing.. Ring final circuit.. Supplementary insulation.. Thermal storage floor heating system.. Safety service.. Supplier. Triplen harmonics.. Sauna.. Surge current, {534}.. Trunking. SELV (separated extra-low voltage).. Surge protective device (SPD), {534}.. Verification.. Selectivity. Switch.. Voltage, nominal.. Shock. Switch, linked.. Extra-low.. Shock current.. Switch-disconnector.. Low.. Short-circuit current.. Switchboard.. High.. Short-circuit current under standard test conditions Isc STC.. Switchgear.. Voltage, reduced. System.. Voltage band. Show. Simple separation. Simultaneously accessible parts. Skilled person (electrically). Socket-outlet. Spur. Stand. Standard test conditions (STC).. © 2008-2015 Electacourse. TN system.. Band I. TN-C system.. Band II. TN-S system.. Voltage protection level (Up), {534}.. TN-C-S system.. Wiring system.. TT system. IT system. Multiple source and d.c. systems Temporary electrical installation. Page | 42.

(44) 17th Edition Training Manual It is well worth taking a good amount of time to read through the Definitions. Don’t attempt to memorize them, but familiarity will help you quickly locate answers to questions on the Definitions section in the exam.. electrical energy other than a neutral conductor, a protective conductor or a PEN conductor. The term also means the equivalent conductor of a d.c. system unless otherwise specified in the Regulations.. Significant regulations new to 17th Edition. Definitions relating to personnel. Definitions relating to current. It is important you fully understand the difference between: Overcurrent A current exceeding the rated value. For conductors the rated value is the current-carrying capacity Overload An overcurrent occurring in a circuit which is electrically sound Fault current A current resulting from a fault Earth fault current A current resulting from a fault of negligible impedance between a line conductor and an exposed-conductive-part or a protective conductor. The definition of Competent person no longer applies. Instead new definitions are introduced which more accurately define the nature of skills and competency. Skilled person (electrically) Person who possesses, as appropriate to the nature of the electrical work to be undertaken, adequate education, training and practical skills, and who is able to perceive risks and avoid hazards which electricity can create. Instructed person (electrically) Person adequately advised or supervised by a skilled person (as defined) to enable that person to perceive risks and to avoid hazards which electricity can create.. Ordinary person Person who is neither a skilled person nor an instructed person.Other significant new definitions. Short-circuit current An overcurrent resulting from a fault of negligible impedance between live conductors having a difference in potential under normal operating conditions. Auxiliary circuit. Circuit for transmission of signals intended for control, detection, supervision or measurement of the functional status of a main circuit.. Line conductor. A conductor of an a.c. system for the transmission of. Low voltage switchgear and controlgear assembly. Combination of one or more low voltage switching devices together with associated control, measuring, signalling,. © 2008-2015 Electacourse. Page | 43.

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