This popular guide provides an understanding of basic design criteria and calculations, along with current inspection and testing requirements, explaining how to meet the requirements of the IET Wiring Regulations. The book clarifies common misconceptions regarding bonding, voltages, disconnection times, and sizes of earthing conductors, making it easier for readers to follow correct procedures. Fully up to date with the 18th Edition of IET Wiring Regulations, this resource simplifies the advice found in the Wiring Regulations, offering practical insights into their application in real-world scenarios. Ideal as an affordable reference for electrical contractors, technicians, and other workers involved in designing and testing electrical installations, the content covers requirements for both City & Guilds and EAL courses, includes sample exam questions and answers, and serves as an excellent revision guide. Expert advice from an engineering training consultant is supported by color diagrams, examples, and key data.