Wiring a fan from the main circuit

[thuynh7]

I\\\'m trying to connect a new extractor fan in my bathroom, it\\\'s powered from the bathroom circuit and not the corded light switch, and the on/off control comes from the fan\\\'s humidity sensor.


Out of the wall comes for wires, red, blue, yellow and earth.


In my fan there are two cables, blue and black, coming from one of those plastic junctions (one is empty). Also the fan does not need to be earthed.


is the correct wiring from wall to fan


red --> blue
blue --> black
yellow --> emtpy

or

blue --> blue
red --> black
yellow --> unconnected.



thanks all

[Spark123]

Are you sure it is a black and not a brown? There is probably a live, switched live, neutral and earth on the supply cable which is the common arrangement for a bathroom fan with a timed run-on, the blue normally being used for neutral connecting to the blue on the fan and the red being permanent live which connects to the brown. If the fan switched on/off by the light pullcord swop red/yellow wires. Terminate the earth into one spare terminal and the switched live into another. You should also have some sort of isolator to allow you to kill the power to the fan for cleaning etc, which if you haven't got is a notifiable job under part p England/Wales to add one.