Now in its 10th edition, Electrical Installation Calculations: Basic has been updated to include any changes required to bring it in line with the 18th edition of the IET electrical wiring regulations (BS7671:2018).

Electrical calculations required for exams can prove difficult to master, but for more than 40 years, this book series has proved very helpful to students and professional electrical engineers studying for electrical qualifications. It covers all the calculations required for Level 2 electrical qualifications, along with other useful calculations that may be used in the electrical industry but may not feature in the syllabus of some exams.

Although the calculations in this book are referred to as ‘basic’, they form the foundation of all calculations carried out in the electrical industry, which have been set out simply with worked examples along with additional questions and answers. Key terms are explained in a glossary, which can be used to assist with the reader's understanding.

chapter 1|2 pages

Use of Calculators

chapter 2|2 pages

Simple Transposition of Formulae

chapter 3|3 pages

SI Units

chapter 4|1 pages

Conductor Colour Identification

chapter 5|17 pages

Circuit Calculations

chapter 6|4 pages

Voltage Drop

chapter 7|8 pages

Areas, Perimeters and Volume

chapter 8|11 pages

Space Factors

chapter 9|2 pages

Coulombs and Current Flow

chapter 10|11 pages

Internal Resistance

chapter 12|3 pages

Power Factor

chapter 13|3 pages


chapter 14|3 pages

Electromagnetic Effect

chapter 15|1 pages

Induced e.m.f.

chapter 16|2 pages


chapter 17|6 pages

Mutual Inductance

chapter 18|8 pages

Cable Selection

chapter 19|6 pages

Earth Fault Loop Impedance

chapter 21|6 pages


chapter 22|5 pages


chapter 23|15 pages

Electronic Symbols

chapter 24|4 pages


chapter 25|15 pages

Answers to Exercises

chapter 26|18 pages

Additional Questions and Answers