Join Date: Jul 2016
Location: West Sussex, England
The UK equivalent of a GFCI is an RCD.
They don't protect against over current between live and neutral (that's what a fuse does) they protect against any current at all between live and earth or neutral and earth.
Imagine you touch the live wire of your heater. The resistance of your body is quite high so less than an amp flows. That means a fuse would never trip. However, an RCD / GFCI will notice that some current is flowing out of the live wire but none is flowing in through the neutral wire. That must mean there's a fault so it cuts the power.
TL;DR its already standard protection in UK wiring, you don't need to add one if you have a house with modern wiring. If your fuse box has a "press to test" button, you're covered.
Last edited by TwoTurtles; 02-13-2017 at 09:32 PM.
Reason: Old houses might not have this