This is a step by step guide for calculating the live and earth cable size using both the On Site Guide and BS 7671 18th Edition. 
 
The guide tells you every formula you need, every page to turn to and every table to use. 
 
It also gives some additional comments to make to enable you to gain those all important extra marks on your exam. 
 
Following this easy step by step guide will almost guarantee you score maximum marks in that tricky, cable calculation question, that occurs in every final exam!!
 
Take the hardship away, of trying to remember all those pages and different tables to use. 
 
Use this powerful guide to easily obtain top marks, and when combined with the BS7671 and On Site Guide page marker tabs, those top marks are in the bag!!
 
This guide page is available for free to all members who hold an annual subscription.