Many of the blogs i have written in the past mention how important it is to have an RCD fitted in your home. Although i've explained the importance of having one, i've never actually explained what an RCD does and how it protects the household.
An RCD stands for Residual Current Device. It is an essential safety device that automatically cuts off the electricity if there is a problem. This might sound pretty boring and bog standard, and you might even wonder what the point of having one is.