Hi, I am resitting my FICA Underpinning Knowledge test next week and I stuck on a few questions in the mock tests they have on their website. I have been doing a lot of revision but my brain has gone to mush. Can anyone help with the following question? Question - The maximum earth fault loop impedance for a 16A BS 88-3 fuse system C for a 5s disconnection time with a U of 230V is A 5.08 B 3.9 C 3.2 D 3.64 They give you the answer but not how the answer is reached. Many thanks in advance for any help given.