This means that there's a good reference and us unpaid helpers dont have to waste more time just typing out the same thing over and over and over and over and over again. No. It means that the switched live output from the light switch needs to go to both the light and the fan (Via fused switched outlet). When it comes to the cable that should be used, as extractor fans are low voltage it’s possible to use 1mm or 1.5mm cable. Also, for timed unit extractor fans, as there is an extra cable you can use 3 core and earth, however if wiring a standard fan with no timed switch, 2 core and earth is fine. In terms of zones and where a switch can be fitted, this is generally best done in an area of zone 3, but you have to ensure that the correct rating of switch is also used, but your electrician will know for sure what to use. Tools and Products Needed to Wire a Timed Extractor Fan Before anything is done at all the very first job is to isolate the power to the circuit you will be working on! This means pulling out the fuse or turning off the MCB for the lighting circuit the bathroom light is getting power from.

As we have stated above, if an extractor fan is being installed from scratch then this will need to be done by a qualified Part P registered electrician. However is you are simply replacing an existing broken unit then you are able to do this yourself. Once isolated, the next job is to install the fan isolation switch/3-pole switch. Where this is done will depend on the switch you have. Another point to be aware of is that in many installations a 3-pole isolation switch is fitted to the fan to allow it to be totally isolated from its electrical supply in the event it needs maintenance work. Please be careful taking advise off any Wiki, book or Forum before undertaking your own wiring if you are not 100% confident.We have concentrated on the actual wiring in this section, rather than the other elements of the installation. If you want to know about these, simply work through the steps in the section above. From the FCU, the 3-pole isolator switch is connected up using a suitable length of cable that’s stripped at both ends. It’s connected between the 2 units, neutral terminal to neutral terminal, live terminal to live terminal and earths to earths. Its not a smart a**ed reply. Some people on this forum (who dont get paid for it, mind) have taken a lot of care to put together guides to help with the more commonly asked questions.

A 4-termial junction box is required to connect up the fan, 3-pole switch and the pull switch, and is wired similarly to a ceiling rose or light junction box, utilising connections for earth, neutral, (permanent) live and a switch-live. For both different types of units they can also be tuned on and off through normally 2 different means; they are either wired into the light, so that when it’s turned on the extractor comes on also or they have their own dedicated switch, normally as an isolator outside the bathroom above the door or inside as a pull cord switch. An extractor fan is an essential part of any bathroom as it helps to remove the excess moist and humid air produced by the shower and keep any condensation build up to a minimum. The 3 pole switch ensures complete disconnection of supply to the fan so that maintenance can be carried out safely, without the need for a qualified electrician to disconnect the wiring (N.B. if you are in anyway unsure of how to carry out routine maintenance/cleaning on the fan, you should always seek the advice of a qualified electrician). As there are several different ways that a timed extractor fan is wired up, here we will cover the most common method; Taking a power feed from an existing bathroom light.

If you are installing an axial through the wall type fan then you may need to run a short section of pipe between the inner and outer sections so that it bridges the cavity as you don’t want to be pumping moist air down into your empty cavity as this will cause untold amounts of issues. Finally, connect the pull-cord switch that wil be used to turn the fan on and off into the junction box using normal 2-core cabling as with any other light switch. In this instance, the switch live (SL) connection is not used but it is recommended that a 3-pole switch is still fitted as it would allow the circuit to be reconfigured to work with the light switch in future if desired. In a similar manner, the junction box for the live feed is then wired to the FCU, again, each wire connected to the correct live, neutral and earth terminals.

This would be ideal as there is no natural lighting in the room anyway but I am not quite sure how to go about this. Marley 5" 115mm Induct Extractor Induct Utility Fan. Induct fan (Standard Model). Manningham Lighting & Electrical. Model Number: Airvac TF115BSK - Standard Model. Condition: New & Boxed. DM Edit 17/10/18. Putting that aside, I appreciate that people taking the time out to reply are doing so unpaid but I've yet to find a member of the Samaritans, for example, who would resort to sarcasim when the umpteenth person calls in on thier shift to say they've had eenough of life. Mind you, if breezer's diagrams are anything like his wiring, there will be a few less potential customers going about. A larger diameter hole (stated in the instructions) is drilled in the ceiling above the shower, bath etc. and the vent is inserted and fixed up after the end of the pipework is fixed. The same is done at the other end in a suitable location to vent the moist air, normally through a soffit closer or fascia board.As it’s in a bathroom, although it’s not required, the belt and braces approach is to fit a 3-pole isolation switch so that all potential live points; permanent live, switched live and neutral are isolated when the switch is turned off. This briefly covers the 2 main different types of extractor but for a full and detailed run down, see our types of extractor fan project here. Types of Bathroom Fan Switch Configuration Next, the fan itself needs to be installed. How this is done will depend entirely on what type of fan is being installed. The wiring diagram below shows the wiring setup you need to connect your new timed fan to your existing light circuit ceiling rose so that when the light is turned on, so is the fan. The instructions state that it can be operated by connecting it to a light switch so that the fan will start when the light is switched on.