The document summarizes chapters and sections from Part 5 of the 17th Edition IEE Wiring Regulations covering requirements for electrical installations. Chapter 52 focuses on the selection and erection of wiring systems, outlining 10 sections on topics like cable types, current capacities, voltage drop and protection from fire spread. Section 521 specifically discusses types of wiring systems like cables, busbar trunking, powertrack systems and requirements to prevent electromagnetic heating effects. The document provides examples from tables in Appendix 4 on common installation methods and cable reference methods.

1. Requirements for Electrical Installations IEE Wiring Regulations 17 th Edition Part 5

2. IEE Wiring Regulations 17 th Edition - Part 5 As stated; one of the larger parts in the 17 th Edition It consists of 6 chapters: Chapter 51 Common rules. Chapter 52 Selection and erection of wiring systems Chapter 53 Protection, isolation, switching control and monitoring Chapter 54 Earthing arrangements and protective conductors Chapter 55 Other equipment Chapter 56 Safety services

3. Requirements for Electrical Installations IEE Wiring Regulations 17 th Edition Part 5 Chapter 52

4. Chapter 52 Selection and Erection of Wiring systems Consists of 10 sections Section 520 - Introduction Section 521 – Types of Wiring Systems Section 522 – Selection and Erection of Wiring Systems in relation to External Influences Section 523 – Current Carrying Capacities of Cables. Section 524 – Cross-Sectional areas of Conductors of Cables

5. Chapter 52 Selection and Erection of Wiring systems Section 525 – Voltage Drop in Consumers Installations Section 526 Electrical Connections. Section 527 Selection and Erection to minimise the Spread of Fire. Section 528 Proximity of Wiring Systems to Other Services. Section 529 Selection and Erection of Wiring Systems in relation to Maintainability, including Cleaning

6. Chapter 521 Types of wiring system Table 4A2 of Appendix 4 states which installation methods are appropriate for commonly installed conductors and cables.

7. Chapter 521.3 Types of wiring system Examples of wiring systems are shown in Table 4A2. The table should be used first to find the ‘installation method’, and then the reference method relating to it. The reference method is required to determine the current-carrying capacity of a cable or flexible cord from Tables 4D1A to 4J4A . A sample of Table 4A2 is shown on the next slide

8. (Parts of) Table 4A2 in Appendix 4

9. (Parts of) Table 4A2 in Appendix 4

10. Typical installation methods and related reference methods Installation method Reference methods Cables in conduit and multi-core cables in a thermally insulated wall A Cables in conduit, trunking, ducting or building voids. Single-core or multi-core cables fixed directly under a wooden or masonry ceiling. B Clipped direct C Cables laid direct in ground or in ducts in ground D Cables on perforated tray, brackets, wire-mesh tray, ladder E or F Flat twin and cpc cables (Table 4D5) 100,101, 102 & 103

11. Chapter 521.4 Busbar Trunking Systems Commonly-used in buildings in a variety of ways to distribute electricity. Must comply with the requirements of BS EN 60439-2 Also addressed in Appendix 8

12. Typical arrangement of overhead Busbar Trunking Used for both distribution and final circuitry by means of interconnecting Busbar Trunking of different ratings. It is: available in a wide range of current ratings (up to several thousand amperes) designed to be installed in installations where there may be high fault levels. Such systems (often overhead) often supply machinery, providing flexibility

13. Typical arrangement of rising main Busbar Trunking Applications include multi-storey commercial or domestic properties. ‘ Rising main’ Busbar Trunking systems are often used to provide supplies to individual floors within buildings

14. Chapter 521.4 Powertrack systems Are normally used for supplies to final circuits. Are commonly-used for under-floor distribution systems feeding socket-outlets or office furniture, or above ceilings to provide supplies and final connection points to luminaires. Generally have a maximum rating of 63 A Must comply with requirements of BS EN 61534 series

15. Chapter 521.5 Electromagnetic effects Electromagnetic effects from incorrectly installed cables of alternating current (a.c.) circuits can cause heat . To prevent such heat, which may damage cables and other materials, single-core cables armoured with steel wire or steel tape must not be used for a.c. circuits .

16. Chapter 521.5 Electromagnetic effects All cables to pass through the same entry/exit hole

17. Chapter 521.5 Electromagnetic effects Non-ferromagnetic metal or non-metallic entry plate to be used

18. Chapter 521.5 Electromagnetic effects Ferro-magnetic fixing plate may be used provided slots are cut in plate between conductors

19. Chapter 521.6 Conduit, ducting, trunking and ladder systems Regulations 521-6 to 521-10 provide some general requirements for the above wiring systems including: Multiple circuits are permitted within the same wiring system or multi-core cable (See Section 528 though) Separation of conductors from different final circuits (See also Section 314) Use of flexible cables or cords (See also Section 522) Non-sheathed cables of fixed wiring to be enclosed (See also Section 522)

20. Chapters 521.7 & 521.8 Regulations 521.7 & 521.8 have already been covered in Part 3 and Section 528 covers the segregation issues in depth

21. Well that was Section 521 Types of Wiring Systems Does this make sense? GOOD – We will carry on - - - - - - - - To section 522