Whilst generally a reasonable book, there are a considerable number of errors. These include referencing incorrect tables and regulation numbers, and a number of simple typographical errors, e.g. stating that the minimum diameter for the main protective bonding conductor should be 60mm sq, rather than 6. Whilst the more experienced will instantly spot these errors, they could lead to confusion to the novice, who, after all, the book is aimed at. One particular area of concern is in the Inspection and Testing section where, in the process of determining R1+R2, the reader is advised to temporarily link together the line conductor and the CPC. At no point is any emphasis placed on the fact the circuit must be isolated from the supply before this procedure is attempted!