There's a good chance from the fault you describe that one or more of the plates has a fault that's causing the earth leakage to trip. Problem is that to prove it you need the right test equipment which is outside the budget of most DIY'ers so you're going to have to get a sparky in to do the testing unless you just want to chance that a replacement plate might fix the problem.
Did you like this article? Share it with your favourite social network.