All the essential calculations required for basic electrical installation work

The Electrical Installation Calculations series has proved an invaluable reference for over forty years, for both apprentices and professional electrical installation engineers alike. The book provides a step-by-step guide to the successful application of electrical installation calculations required in day-to-day electrical engineering practice.

  • A step-by-step guide to everyday calculations used on the job
  • An essential aid to the City & Guilds certificates at Levels 2 and 3
  • For apprentices and electrical installation engineers

Now in its ninth edition, it is in line with the amendments to the 17th Edition IET Wiring Regulations (BS 7671:2008) and references the material covered in the Wiring Regulations throughout. The content also meets the requirements of the latest Level 2 qualifications from City & Guilds (including the new 2365 Diploma). Essential calculations which may not necessarily feature as part of the requirements of the syllabus are retained for professional electrical installation engineers based in industry and students wishing to progress to higher levels of study.

Key terms are explained in a glossary section and worked examples and exercises are included throughout the text. A complete question and answer section is included at the back of the book to enable readers to check their understanding of the calculations presented.

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|18 pages

Circuit Calculations

chapter 6|4 pages

Voltage Drop

chapter 7|8 pages

Areas, Perimeters and Volume

chapter 8|12 pages

Space Factors

chapter 9|2 pages

Coulombs and Current Flow

chapter 10|12 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|9 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