the-Regs : BS7671 18th Edition Online Training
BS 7671: 18th Edition Wiring Regulations – Study when you want and pass your exam when you're ready…
One of the main reasons for using an alternating current a.c. supply is that we can easily change the voltage levels up or down by using a transformer which would be more difficult and expensive to do if using direct current d.c For efficient transmission the generated a.c. supply coming from the power stations is … Read more
05: Cable Size and Protective Device Selection The cable most commonly used in domestic electrical installations is the 70 °C thermoplastic PVC insulated and sheathed flat cable which is often referred to as ‘Twin and Earth’ or ‘T&E’ and is available in various sizes ranging from 1.0 mm² up to 16 mm². As well as … Read more