so this video presentation continues on from a series of videos of done called taking the
feed to the switch however for AM2 and AM2S this can be called the two plate method key that you
remember that because under the pressure of an AM2 or an AM2S you can find that the instructor
would say to its done the two plate method using I've got no idea what's going on it's where they
take the feed to the switch of mimicked in this installation we're going to look at some of the
terminations and some of the connections in order to energize this circuit however let's
go back and think about why we'd want to take the feed to the switch itself with the evolution of
many down lighters and spotlights in domestic dwellings you're trying to reduce the number
of cables at the light point itself if we look at this circuit here we've only got one cable
entering this lighting point if we were to have multiple points from the same switch we'd come
off here with another cable to other lighting points meaning that you only have a maximum of
two cables at any one downlight in an installation making it easier to terminate for the electrician
in order to do that we need to take the feed to the switch in this case from the consume
unit I've taken my permanent line neutral and CPC down to my switch and I'm going to mimic a
one-way switch to start with and from the switch itself we're taking a neutral a switching line
and CPC to the light fitting itself we're going to bring the camera in in a minute I'm going to look
at the terminations look at the overcurrent protection device in order to complete this
circuit a circuit which will be one way with a two plate method in other words taking the feed
to the switch in order to reduce the number of cables at line points okay then so let's going
on the inside our consumer unit we've got our RCD protection in the form of an RCCB because
we know that all domestic law in circuits need additional protection by an RCD rated out and
in this case 30 milliamps or less so that bits correct however my students will notice that
we've got the AC waveform and we're aware that we are not massive fans of AC RCD's we've got
our over current protection device it's B6 so it's rated at six amps is a type B in this case
for the domestic dwelling which was simulating it could be a C type it could be a D type but we've
got a type B here so our RCD protection because lighting circuits require it rated at 30 milliamps
6 amp type B circuit breaker however we could have used one of these this being a miniature our RCBO
so we've got both the over current protection device of a circuit breaker and the additional
protection offered by an RCD in unit again B6 type B6 amps rated at 30 milliamps so again for
additional protection rate at 30 milliamps or less and this time we do like this one because
this is an A type device and we're looking to move towards more A type devices something we've
talked about a lot in the classroom if we leap forward in technology we could have fitted one
of these again let's have a look at it it looks like a miniature RCBO which is an RCBO because
it's rated there at 30 milliamps it's a B6 so it's also the circuit breaker is rated at six
amps type B but if you look there we've got the letters that say a AFDD so this is an art fault
detection device the RCD itself within it is an A types and we like that so we could find as we move
forward that technology requires us through the regulations to start in more and more arc fault
detection devices so just to recap what we've got RCD protection overcurrent protection rated
at six amps so one of my previous presentations I showed how to fit a circuit breaker of the star
breaker designed for Crabtree into a consumer unit and how to connect the conductors in order
to terminate a circuit so I won't show that again what a will show the next part of presentation is
the connections when the feed has been taken to the switch in order to connect to one way switch
so at the switch now subtle difference than all the other lighting circuits of actually
wired at colleges that we've now got two cables we've got two twin and CPCs here we've got the
feed coming in so we've got a line a neutral and a circuit protective conductor coming in in this
case from the consume unit and going out we have a switching line a CPC and another neutral I know
at some colleges where there is say one cable coming down to a switch of twin and CPC often it
is the blue is a switching line conductor and is identified with Brown sleaving in this case where
the feed has been taken to the switch during the 2 plate method both the blue conductors are actually
neutrals let's look at terminating first of all the CPC's so this fold the other conductors out
of the way so let's get those at out of the way like so and we'll concentrate on connecting the
CPC so an insulated box on the insulated switch so we don't need a CPC we need it if there was an
exposed conductive part and metallic like switch etc however we're still going to need it as part
of the circuit and further upstream so we're going to connect them in the back of the actual
switch itself remember the rule for Gary is it's approximately about 70 mm longer than the box for
all conductors so if I cut those off at that point just there and then we can over sleeve it so we've
got to put our green and yellow sleeve in on so I can measure the length approximately down to here
fold it then in half and we can cut those two to exactly the same length so if they can go on like
so there's one the other we still going to double over our terminations so I'm still going to double
them over to go into here so take our CPC might just trim it back a little bit and I'm just going
to double it over a technique we see many times on the channel before the other one trim it back
and double it over like so take my screwdriver and I'll connect those in the back of the box
I simply go in it's an easy first time on camera like that just push that one in and hold it we've
got CPC is terminated into the back of the box just dress those out of the way all right so and
we're ready now to look at next one let's do the neutrals next so let's take those two neutrals
down to here again approximately 70 mm longer than the box like so and this time we're going
to use our Wago and this is a three conductor connector we could have had a two conductor
connector I just couldn't one find one for the video so a three conductor connector here and on
the side of it as shown previous videos you can see that you've got a strip back to it 11 mm the
insulation off the conductor's themselves so we'll do that next so proximally 11 mmm I'm a knife
okay so pop that one off same on the next one to it taking off approximately 11 mm press quite
firmly with your knife and we go and hopefully that will taking our Wago connector lift up the
levers and so our conductors in like so and then just they'll go so they are now connected so
I've got those two conductors connected we've got a three conductor connector there for our
neutrals and again they're going to need to be placed inside the box however the way so let's
just dress those around like so next we'll be ready for the lines take our line conductors
again approximately 70 mm longer than the box cut those off I'm going to take our knife going
to double these over as well so we're going to double these over it's reasonably firm with a
knife doing approximately the same length like so okay double these over taking slightly less
than half for me against itself squeezing up the gap taking slightly less than half folding
it over squeezing it up against itself that gap so I've got two doubled over terminations like
so ready to go into the actual switch itself so which I'm going to use is a one-way switch
common and L1 doesn't really matter which way around they go but I will put the incoming line
conductor in common and the switching line in L1 so take the line conductor and when we go like
so just push it back into place so as I'm holding it there and hold it in place as I tighten it up
so and then take my switching line and going to our one can hold it into place as you tighten
it up like so then we have the connections okay let's just take a little bit of PVC insulation
another way so let's have a look then so we've got our permanent line coming down into common got a
switching line going back out to our light fitting we've got our two neutrals connected together in
a Wago connector block and our cpc's is secured in the back of the box because it's a fully insulated
box and switch remember this method called taking the feed to the switch can often be called the two
plate method really key that we remember that so let's have a look at the connections in the
actual ceiling rose itself in this case of batten holder I've used a conventional three plate one
so we've got the loop in terminal in the centre which is no longer needed we've got the switching
line coming from the switch the neutral coming from the switch and the CPC also coming from
the switch so this cable here brought in the switching line neutral and CPC and is connected
neutrals across the lamp switching line across the lamp and the CPC secured in the back of the
actual fitting itself and we can see how this 2 plate method reduces the number of cables here
at the lighting point very important when we're fitting downlights LED spotlights etc that will
reduce the number of cables and by using the 2 plate method we means we've cut down the number
of conductors if we want another light to come on at the same time the neutral the switching
line and CPC would loop round to the next light to the next light to the next light meaning that we
get a maximum of two cables per downlighter so hopefully that's added to the series of videos
called taking the supply or taking the feed to the switch that I've made for the channel
ready when we're looking at now calling it the 2 plate method so just to go back through what
we did the feed came from the consumer unit it but it could come from another room within the
dwelling and that supply went straight to our switch from the switch we went up in this case
just to one lighting point often it's too many downlights the advantage being would reduce the
number of cables at the lighting point we make our connections for the neutrals the line switching
line cpc's all within us which itself this was a one-way method we can extend it to two-way and we
can extend it to two way and intermediate and I may do that in future video presentations along
with testing this circuit but for the time being I hope this video has been some help
you