In the US at least, the electrical code requires that any electrical outlet within 6 feet of a sink must be equipped with a ground fault circuit interrupter. It trips the circuit at a lower current than that which could electrocute you. An old electrician told me once that GFCI's on each outlet are safer than a remote one protecting several outlets because they act quicker, but I don't know if that is fact. Given my aversion for becoming part of an electrical circuit, I took his advice. I plug in a thermostatically controlled tank sitting in the darkroom sink that keeps my developer at the proper temp in cold weather, and it occasionally trips the GFCI, which is annoying but lets know know it is doing its job.