Maximum Demand and Diversity Calculation Explained - BS 7671 On-Site Guide Appendix A In this video we go through step by step the calculation for working out maximum demand and diversity for a single phase installation. For this version of the calculation we take 100% of the largest circuit fuse rating and 40% of the sun of all the other fuse ratings and add these numbers together to find the maximum demand for the installation. Videos are training aids for City and Guilds (C and G) and EAL cou

Explained - Airing Cupboards in Bathrooms In this video Marcus looks at how BS 7671 deals with airing cupboards in bathrooms. Marcus explains how the electrical content of an airing cupboard with a door on it falls outside of the special location that is the bathroom. However if the airing cupboard door opens out into either zone 1 or 2 of a bathroom then equipment inside the airing cupboard requires additional protection by an RCD rated at no greater than 30 mA. Videos are training aids for Cit