I have had a problem with an RCD tripping out recently in my house.
Each time it happens we investigate, unplug everything, check each circuit and find nothing. The RCD has been changed.
Does any one out there have any experience of a similar fault and how did you track it down?
P.S. I am doing my 2391 in May. I am at an age where I put the information in my head and it promptly falls out the other side. Is the exam as hard as I hear?