this video continues on from my first one that i did on two gang switches so we have a two gang
switch here and we produce this wiring diagram which was say a light here simulated in a kitchen
and one in the dining area of the kitchen independently switched from here for the kitchen
light and here for the dining area light from a two gang switch we looked at the back of a two
gang switch and we said that all the switches on a two a three and a four gang were two way switches
so we had common L1 and L2 and that's what we drew down here i said it would be a simple process
also to convert one of the switches or both i'm going to do one in this to two way so this is the
kitchen light and switch and this is the light in the dining area and switch but let's say we wanted
to make this one two way we can already see that the switch on the wall even though we're using it
in here as a one way can be converted to a two way without ever replacing the switch itself so we're
just going to alter the wiring within the switch and add a new cable across to our other switch
which will be a two way switch so we're going to have a two way switch with a common L1 and L2 this
time a one gang version somewhere else in the area so this becomes a two way switch it already is is
part of our two gang switch and we add in another switch which is two way and we couple it together
by wiring it through using a three core and CPC or three core earth cable and we've got our colours
which we're really familiar with in this series of videos where we've got brown black grey and a bare
conductor which will be over-sleeved with green and yellow sleeving in order to identify it as a
circuit protective conductor and as we're going to be using this three core to interconnect two
switches we know that the black and the grey will be switching line conductors and also during the
presentation we need to identify them with brown sleeving to identify the switching line conductors
the notes for these are available in a downloadable link so if you look in the link in
the description you'll have access to this booklet here i will alter and change the diagrams that we
use within it as we go along and this one probably isn't in there this one here is but adding this
additional sheet here which i'm going to do in a minute like so in order that we can change the
wiring here so we're going to need to move these cables out of these positions into new positions
well the easiest way for me to do is just to bring a little piece of paper in and therefore we can
reconnect the two conductors coming down from the light switch being our line and switching line
and obviously re-divert our CPC as well so that's what we're going to do we're just going to stick
this in place we're going to convert this one here the dining area light is now going to be
made two way we do nothing with the switch apart from the fact i need to change its connections and
we're going to add in another switch here which is two way so let's bring it in and position it so we
can just alter this drawing and put a little bit of glue on the back to hold it in position for me
so that's it there so all i've done is kept the two gang switch and for me it's a case of just
removing those conductors well let's put the the ones in that would already be there so the cpc
from the light in the kitchen came round into there strike that with a little bit of yellow
and we had the cpc coming down from our twin and cpc cable which was already there
and now we've got these conductors here which were permanent line from the loop coming down
and the switching line coming back identified with brown sleeve in which we used the blue
you could have used twin brown so we've got to position these two conductors now inside of our
two gang switch in a different place we had them in common and L1 we're now going to move these
two cables and we're going to put them in L1 and L2 and it doesn't matter which way around they
go so as we look at this i could have the L1 and L2 either way around but i'm going to bring them
down logically so i'm going to bring the blue one down into here and the brown one down into
here leaving no connection now in the common so in real terms you've taken the common connection out
and moved it into either L1 or L2 by sticking a piece of paper on that's what we've done
so let's bring down our switching line our blue conductor now comes down to here and we're going
to put a little bit of brown sleeving on it and we'll bring our brown which has just been really
redirected out of common into L1 or L2 all we need to do now we've seen it in other video
presentations on both the two plate and three plate which i recommend you go back and look at
if you're starting at this point you need to a little bit of knowledge of
what we've done to get to here so what we're going to do now is this is exactly the same so
no cable changes other than a move of a cable within the switch so nothing's happened here
all you're going to do is from this position here the two gang switch introduce a three core to the
area in which you want the other switch and then you're going to chop a box in the wall and insert
our two way switch so you'd end up chopping a box into the wall and you'd put your two way switch in
it's one gang one switch on the front two way so this three core here would go through the fabric
of the building maybe chased within it run under floors in roof spaces or wherever it's gonna take
its route but from us we're just interested in the connections in the two gang switch
and the connections in the new two way switch in order to control this lighting point here
from two positions hopefully we'll remember from other presentations i always use black as common
on site they often don't sometimes they use brown but i always use black as common and i've got my
two strappers here which are L1 and L2 and again it doesn't matter which way around they go
but generally i tend to bring the brown or the three core out of the brown
which went up to the light black in common and grey in the other connection cpc comes across
so let's add that 3 core cable in so i'll just simply bring the cpc it's easiest route across
remember you'll be using a ruler for this so that's my cpc and my cable brought across and
let's go with black for the common try and make it a little bit neat it is difficult
so bring the black across so that goes across there remembering we must put brown sleeving on it
on both ends so we're identifying our conductor here which is black with
brown over sleeving to identify as a switching line conductor something we're very used to doing
so that's my blacks linked together in my common i'm gonna bring my brown and my three core across
so i'm gonna bring that one out and i'm gonna bring my grey of my three core
out as well and let's bring those into the next switch again doesn't matter which ones
they go in so it's easier for my drawing to go this way around and that's my three core in
but remember the grey will need brown sleeving on both ends to identify it
as a switching line conductor so we've done that so we had our original two gang switch and we know
the two gang switch they're both two way switches on the back so we did nothing other than remove
the connection from the common which was brown and put it into either L1 or L2 so this cable here
just got rediverted from our original check back if you're not sure what i'm talking about
and then we introduced a three core across to our new switching position here which gave us
a two way switch we had the black as common and it didn't matter which way around L1 and L2 went
for the grey and the brown and introduced that two way switch a new position so now when we look
at our diagram our wiring diagram our original two gang switch here still this switch operator switch
in the kitchen still this one operates the one in the dining room but we now can also operate the
dining room from another position so that gives us two way switching of this light fitting here
we could have done the same we could come out this one to another area of course the drawing
starts to get a little bit crowded but we could have brought a two way switch across to here
and we could have made both of them two way just by simply taking out the connection in the common
and putting either L1 or L2 and introducing the three core as we've just done there
so hopefully that's just started the process of extending this through in the next video we'll
look at a scenario where the light downstairs and the light upstairs are from a two gang switch
something very common as you come in the front door normally there's one for the ground floor
light and one for the light on the landing but they're often from two different circuits so the
downstairs lighting circuit is separate from the upstairs lighting circuit and will show the cables
coming in differently and what it means in the switch when you have the downstairs and upstairs
lights off different circuits with the cables within a two gang switch so we'll investigate
that and then we'll look at some solutions that we can come up with in order to change that process
and we'll go on and we'll two way we'll perhaps make these down lights we'll use the two plate
method to show a two gang switch as well so this series will continue on looking at
other ways in which we can use two gang switches both with the three plate and two plate method
remembering we use the three plate light and wiring method for this one and we've extended
our circuit from being a simple uh two gang switch with them both being one way and we've converted
one of them now to be two way operated and as always i hope this video has been some help you