in this video I'm going to show you how to wire and fit a three pole fan isolation switch like this I'll show you how to wire the switch to a time of famine using some three-cornered cable and I'll show you how to wire the switch to a non timer fan using some twin and earth cable I'll go through some basic wiring diagrams to help explain the wiring and I'll give you a practical demonstration where I physically show you how to fit my or the switch just remember all domestic electrical work in the UK must meet the requirements of the party regulations so in a typical scenario we need to get power for our extractor fan from our seed in light within the bathroom with in the wiring you'll have a neutral terminal a loop terminal a line terminal and an earth terminal this is a typical setup of some seeding light wiring if you want more specific information on this you can watch my other video how to wire a ceiling rose there'll be a link to the video pop up on the screen now and there'll be a link to the video in the description section below now the loop is basically your permanent live and your line is your switch life whenever the bathroom switch is turned on it will provide power to the line which in turn provides power to your light bulb turning your light on this is the terminal we need to connect into with our fan in order to turn the fan on and off if you have a timed fan with an overrun then we also need a permanent live which connects into the loop in the scenario I'm going to show you here we're using a timer fan so we need to use some 1.5 millimeter three core and earth cable if you don't have a timer fan you could just use the one point five millimeter twin and earth cable if you have the old color wiring in your home you can use these tables to convert it to the new color wiring this Cable will have a gray wire which we'll use is our neutral we'll have a brown wire which we use as our permanent live we'll have a black wire which were use is our switch live and you'll have the bare wire which we'll use is our earth we need to place the grey wire into the neutral terminal we then place some blue tape around the end of the wire to indicate this acting as the neutral place the brown wire into the loop terminal replace the black wire into the line terminal we place some brown tape around the end of the wire to indicate is acting as a switch life and then we place the bare wire into the earth terminal placing some ear sheet over the end now somewhere between this end of the cable and the extractor fan need to place our three pole isolation switch which allows us to isolate the power to the fan this is usually placed above the bathroom door if we take a look at the back of the three pole isolation switch we'll have three terminals on the top which is our supply and we'll have three terminals on the bottom which is our load and you usually have something along the lines of an l1 and l2 and l3 on the top and you'll have the same on the bottom some scenarios you'll have an N underneath the l3 to indicate this can be used as the neutral but in theory you can place any wire into any one of these terminals if it does show an n then obviously place the neutral into that terminal the important thing to remember with the three pole isolation switch is that whichever why are you placing two the terminal on the supply you place the same wire into the load at the bottom so in this example we're going to place the black wire which is to switch live into the l1 and again we place some prank over the end to indicate that it's acting as a switch live we place the brown wire into the l2 terminal and we place the gray wire into the l3 terminal on this example it's labeled up with a name twin DK but it's the neutral who plays some blue tape over the end of the wire to indicate it's acting as a neutral then we take our second length of cable which is running from the switch down to the extractor fan and we do exactly the same placing the black switch live wire into the l1 we place some brown tape over the end of that to indicate it's acting as a switch live we place the brown wire into the l2 and we place the gray wire into the l3 we place some blue tape over the end of the gray wire to indicate that it's acting as a neutral and you'll notice we have four wires but only three terminals now the reason for this is our earth wire needs to be continuous the earth wire was connected into one of these terminals and the switch was turned off it would completely disconnect the continuity of the earth wire which could be dangerous and this is why we place the earth wire into a separate connector block just behind the switch this maintains continuity right the way to the fan even when the switch is turned off so we placed year's wire from the supply coming from the light into the collector block then we place the earth wire to the load into the other side of the collector block connecting the two together if you're attaching your three pole isolation switch onto a metal back box then this will also need to be earthed to do this you simply add another earth wire from this connector block and take it to the terminal in the back of the metal back box this cable then runs up the wall and through the ceiling back to your extractor fan then place the black wire into the terminal labeled T in the extractor fan we put some brown tape over the end of the wire again to indicate it's acting as a switch live we place the Brown live wire into the L terminal and we place the gray wire into the neutral terminal we place a piece of blue tape over the end of that to indicate that it's acting as the neutral now in a standard extract the fan there plastic and there what's known as double insulated which means they don't require earthing so we just terminate this earth wire into a collector block and leave it behind the fan this means in the future if this fan is replaced with another appliance that requires earthing there is already an earth wire available to connect now in this example we've used a timer fan and basically the switch live is what turns the fan on and the permanent live is what allows the overrun of the timer so if you didn't have a timer fan and you just had a family wanted turned on and off with your light switch with no overrun you could do this with some twin earth cable and the practical example I'm going to show you in a minute with wire in a timer fan so we're going to be using a three-cornered cable like in this diagram I'm going to show you the wiring sets up for a non timer fan and in this scenario we've replaced the previous three-cornered cable with this twin unearthed cable in this scenario we have a blue wire which we'll use is our neutral we have a brown wire which we'll use is our switch live and we have the bare wire which we'll use is our earth obviously with the earth while we place the sleeve over the ends don't need the fourth wire in this setup because for an on time a fan you don't need a permanent live so we place the blue neutral wire into the neutral terminal we place the brown wire into the line and this is now acting as the switch life rather than the permanent life and we place the earth wire into the earth terminal then at the other end of the cable where we go into the isolation switch we're now going to place the brown switch live wire into the l1 the AL - we're going to leave empty because there is no permanent live in this setup we then place the blue neutral wire into the l3 and again we place the earth wire into the earth terminal block then again we match the corresponding color wires so we place the brown wire into the l1 we placed the blue neutral wire into the l3 and we place the earth wire into our connector block only now we're extract a fan where we don't have a timer you'll find they'll only be a live terminal and a neutral terminal so we place our brown switch live wire into the Al and we place our blue neutral wire into the N and again we place the end of our earth wire into the collector block providing earth continuity all the way through the wiring to put your three pole isolation switches above your bathroom door and this is so that if somebody like an electrician came into the home and needed to isolate the fan it's easy to find if your isolation switch was placed down here alongside your bathroom light switch then it could accidentally be turned on while somebody was working on the fan making the fan live which would be extremely dangerous which is why we place it up there above the door the isolation switch is physically secured to a Patras box or a mat or back box in exactly the same way as a standard light switch so now taking a look at the back of the switch let's make sure it's the right way up and on this particular switch it says top by their twin deiicate that this is the upper side of the switch and on this switch we've got an l1 and l2 and l3 on the supply and we've got exactly the same on the loads and if you look on this particular switch on the l3 in brackets we've got a name indicating that this can be used as the neutral now in theory you can use any one of these terminals for any wire the important thing to remember is whichever wire you place in the terminal at the top has to be exactly the same corresponding wire from the other cable directly below so if you place the permanent live into the l1 on the top from the supply you'd need to place the permanent live in the l1 at the bottom on the load and so on so if I turn the switch around you can see on the top it says off and on the bottom it says on so currently with the top facing upwards that is in the off position and that's way it's important to get this the right way around on a three Pole isolation switch like this when the button is turned to off the supply will be live on the top but the load will be dead on the bottom it completely isolates the power to the load the other thing you'll notice is there's only three terminals on each side but obviously we have four wires well this is because one of our wires is the earth and the earth must be continuous so we'll connect the two earth wires together with a connector block outside of the switch and I'll show you how to do that now so taking a closer look we're on a plasterboard wall and we've got a plastic Patras box if you want a masonry wall you're likely to have a metal back box so we've got this cable here which is our supply which is bringing power from the light and we've got this cable here which is taking the load to the fan and you can see for ease I've labeled these a which is something I like to do as it's just good practice because if you ever return to this unit you can always quickly identify which cable is doing what so referring back to the diagram from earlier we can see that the brown wire is our permanent life we use in our black wire as I will switch your temporary live so we've put some brand tape around that and we're using the gray wire as the neutral so we've put some blue tape around that the earth wires are beer so we cut some earth sheath and we place it over the top so first of all I'm going to take the wires from the supply cable and place it into the top of my switch so I'm going to place the black wire which is the switch live into my l1 and tighten up I got a place to permanent live into the l2 and tighten up and place the neutral wire into the l3 and tighten up now I'm going to place the wires from the load cable to the fan into the bottom of the switch and we do this by correspond in the color cables in exactly the same way so where l1 has the switch live at the top we'll place the switch live in our one at the bottom and tighten up where we have the permanent live in our two at the top will place the permanent live into the l2 at the bottom and tighten up where we have the neutral in the l3 at the top we place a neutral in the l3 at the bottom and tighten up now we just have the two earth wires left and to maintain continuity I'm going to connect the two together using this way go to two two connector so place one earth wire into one of the terminals and flick the switch down and that is secure and then do the same with the other one and this connector block can just be left like that inside this Patras box if you have a metal back box there'll be a terminal in the back of the box and you'll need to connect your earth wire in into the terminal and when you do this simply by using a three terminal connector block like this one and then we place our to Earth wires into these two terminals and then we get an additional length of wire like that place some earth sleeve over the top we can place that into the third earth terminal like that and then we place this end of the earth wire into the terminal in the back of the metal back box in this scenario we've got the plastic Patras box which doesn't require earthing so we'll go back to the two terminal connector block now is a good time to test the switch to make sure it's working and then once you're happy with that we can place it all back inside the Patras box then just locate you screws into the threads behind so now the installation is complete we can just turn the switch on like that and the fan will now operate when the light switch is turned on if we need to isolate power to the fan we just turn the switch off like that for more information on how to wear an extractor fan from start to finish you can watch my other tutorials and once you Tory I'll show you how to wire the extractor fan so it can be operated by the light switch and in the other tutorial I'll show you how to wire the extractor fan so it can be operated by an independent switch links to these videos will pop up on the screen now and they'll be links in the description section below so hopefully you found this video useful for more DIY how to hack shell tips and product review please watch my other videos and don't forget to 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