Cable calculation. Calculating the live cable size from BS 7671

This video is mainly aimed at students on Level 3 and Apprentices. The video shows a step by step method how to calculate the size on the live cable only using BS 7671. Each formula you need is shown and explained, each table used and page is shown in detail.
Finding Ib, In, It, Iz and all relevant C factors. Finding the reference methods, mV/A/m value and calculating volt drop.