If the old fan was of the pull switch type then the new live has to run from the light.

Wiring an extractor fan to a light switch.

If the fan used to turn on and off with the light switch then the new live needs to be a permanent unswitched live which you can usually run from a joint box in the loft space. However it is something that most people are capable of doing. How to fit and install a bathroom extractor fan with or without a timer. Using wire strippers peel an inch of insulation from the end of the black and white wires. It must also be possible to isolate the fan by means of a pull switch inside the bathroom or a fan isolation 3 pole switch outside of the bathroom. By splicing the ground wires you don t have to cover them but.

Connect a light and a fan to a new switch. Connect the black fan cable together with the black light wire and the black switch wire and cover them. Locate the switch cable which must be glued through the top or side of the box that serves the fan or the light. Wiring an extractor fan is not a task that most people will feel comfortable doing themselves. In this video i give a step by step guide of how to fit install and wire a bathroom. This becomes the switched live and turns the fan on and off.

In order to connect your new fan correctly you will need to run an extra live wire to the new fan. Extractor fans with an integral timer or timed switch need a 3 core and earth supply to allow the unit to run on after a light is switched off. Wiring an extractor fan with a timed switch that s turned on by existing light switch. Connect the white wires in the same way then repeat with the ground wires.