Tip: Bring this guide to your open book exams. It is significantly faster to navigate than the full BS 7671 (The Big Red Book).

: The guide is a standard for anyone obtaining a Domestic Installer Scheme Qualification related to Part P of the Building Regulations Important Note:

As the guide progresses, it transitions from abstract theory to the hard currency of installation practice. By the middle sections of the Fifth Edition, Whitfield is meticulously detailing cable sizing, voltage drop calculations, and short-circuit current analysis. What distinguishes this text from a mere regulation handbook is Whitfield’s relentless focus on the why . He does not simply state that a 2.5 mm² twin and earth cable is rated for 27 amps; he walks the reader through the correction factors for ambient temperature, insulation, and grouping, reinforcing the underlying thermodynamic reality that electrical work is, ultimately, thermal management.

Dedicated chapters on "special locations" such as bathrooms, swimming pools, and outdoor installations. Who is this Guide for?