Now in its Ninth Edition, Electrical Installation Calculations: Advanced has been updated to include all changes brought about by the introduction of the 18th edition of the IET electrical wiring regulations (BS7671:2018). The advanced calculations have been set out simply with worked examples, along with additional questions and answers. Key terms are explained in a glossary section which can be used to assist with the readers understanding. When this Level 3 book is used alongside the Electrical Installation Calculations: Basic , the entire range of calculations are covered for courses that require electrical calculations for both Level 2 and Level 3. Many of the calculations are required daily by electricians involved in all parts of the industry. This book has been relied upon by both students and electrical installation engineers for over 45 years. It contains all the required calculations for anyone who is engaged or intending to engage in a Level 3 electrical course. This would include but not limited to both City & Guilds and EAL courses.