Chapter 1: Introduction and General Requirements
* Provides an overview of the IET Wiring Regulations, their purpose, and scope.
* Introduces the concept of electrical safety and the importance of complying with the regulations.
* Example: The maximum size of a fuse or circuit breaker that can be installed in a domestic circuit is determined by the current-carrying capacity of the cable.
Chapter 2: Design Considerations
* Covers the factors to consider when designing an electrical installation, such as load calculations, cable selection, and voltage drop.
* Discusses the principles of safety and protection, including earthing and bonding.
* Example: A domestic consumer unit should have a main switch rated at 63A and an RCD rated at 30mA.
Chapter 3: Protection Against Electric Shocks
* Explains the different types of electric shocks and the measures taken to prevent them.
* Covers insulation, earthing, and bonding as well as protective devices like RCDs and fuses.
* Example: All exposed metalwork in a bathroom must be earthed to prevent electric shocks.
Chapter 4: Protection Against Overcurrent
* Discusses the causes and effects of overcurrents and the devices used to protect against them.
* Covers fuses, circuit breakers, and other overcurrent protection devices.
* Example: A 10A fuse protects a circuit by breaking the connection when the current exceeds 10A.
Chapter 5: Protection Against Fire
* Examines the potential causes of electrical fires and the measures taken to prevent them.
* Covers fire-resistant materials, circuit design, and smoke and heat detectors.
* Example: All electrical cables must be run through conduits or trunking to prevent the spread of fire.
Chapter 6: Special Installations
* Provides specific requirements for electrical installations in hazardous areas, such as bathrooms, swimming pools, and outdoor environments.
* Covers the use of special equipment and protective measures designed for these locations.
* Example: In a swimming pool, all electrical equipment must be IP rated for water resistance.
Chapter 7: Inspection and Testing
* Outlines the requirements for inspecting and testing electrical installations to ensure compliance with the regulations.
* Covers visual inspections, electrical tests, and certification.
* Example: A periodic inspection and test (PAT) must be carried out every two years on all portable electrical appliances in a workplace.
Chapter 8: Tables and Appendices
* Provides a comprehensive set of tables and appendices with technical data and guidance.
* Includes information on cable sizes, current ratings, and voltage drop calculations.
* Example: The table for cable sizes provides the maximum current capacity for different types of cables based on their cross-sectional area.
