I am going to fit an extractor fan through the cieling and out of the roof, as the walls are to thick. I have purchased an unswitched 13 Amp connection unit, I take it this goes before the light switch. It is a 6 nterminal connection, 2 Live 2 Neutral, 2 Earth. the fan has three terminals on it, 1 Neutral 2 Switched Live 3 Permanent Live. Does the switched live come from the light or the switch.