The 18th Edition Wiring Regulations contains eight Parts 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 them.
The Regulations themselves are contained with Sections and Chapters of the Parts of the 18th Edition.
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 8 Parts Of The 18th 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
Part 8 Prosumer’s low voltage electrical installations
The 16 Appendices Of The 18th Edition Wiring Regulations
1: British Standards Referenced by the Regulations
2: Statutory Regulations and Associated Memoranda
3: Time / Current Characteristics of Overcurrent Protective Devices and Residual Current Devices
4: Current-Carrying Capacity and Voltage Drop for Cables and Flexible Cords
5: Classification of External Influences
6: Model Forms for Certification and Reporting.
7: Deleted by BS7671:2018+A2:2022
8: Current-Carrying Capacity and Voltage-Drop for Busbar Trunking and Powertrack Systems
9: Definitions — Multiple Source, D.C. and Other Systems
10: Protection of Conductors in Parallel Against Overcurrent
11: Warning and user instruction labels
12: Not used
13: Escape routes and fire protection
14: Determination of Prospective Fault Current
15: Ring and Radial Final Circuit Arrangements
16: Devices for protection against overvoltage
17: Energy efficiency
Understanding the Structure of the Regulations
Although there are 8 parts and 16 Appendices, the 18th Edition Wiring Regulations can best be understood by considering it as organised into four chunks of information:
- Part 1 Scope, object and fundamental principles
This section outlines general requirements for installations - Part 2 Definitions
This section details the nearly 300 definitions which are used in the Regulations - Part 3 to Part 8
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. Part 8 is new to A2:2022 and covers regulations relating to prosumer’s low voltage electrical installations - Appendices
The extensive appendices provide detail information related to the Wiring Regulations