today we're gonna look at two way intermediate switching using the method called wired through
the switch previously on the channel we've explored the three plate and two plate method
for two way intermediate switching so why today wired through the switch for the same
two way intermediate switching the reason being it can come up at AM2
AM2S and AM2E this method i've already on the channel done a wiring diagram to help you
and i recommend that you do the wiring diagram first so check out that video in the description
you can download the handout and draw out this two way intermediate using wired through the switch
let's look at the rig i've got in front of me here because it's certainly different than what we've
seen previously we've still got a supply in this case coming from a consumer unit with our line our
neutral and our CPC into the first switch which will be two way a three core across and a three
core across making the center one intermediate the end one a two way so we've got two way and
intermediate switching but you will have noticed that the cable coming out to feed the light
is off the last switch therefore feed through the switch will require the neutral from here
to make its way all the way to the end so it can actually get up to the lighting point that's
where the wiring diagram video will come in really handy we're going to bring the camera in a little
bit closer and we're going to systematically connect the two way intermediate and two way
switches and look at identifying the conductors and where they should go within the switches
so let's look at the first switch which is going to be two way where the feed comes in so this
cable brings in my line my neutral and my CPC into this two way switch so it's this cable here so
these are my conductors i've already connected the CPC's so neutral and by permanent line connection
come into here and i've got to then work out my three core cable what conductors are going to do
what so one of these is going to have to carry the neutral to the next switch so we've got a choice
okay we're probably going to be choosing between black and gray now when the new cable system came
in in 2004 the black conductor actually became a line conductor and in the old system pre-2004
the black conductor was a neutral so the rule was we tried to denaturalise black so you might be
thinking i'll use the black as the neutral because that's the old system actually the reverse happens
best practice is not to use the black however i'm sure if you do use the black you'll be commenting
below for me so i'm not going to use the black as my neutral i'm going to use my grey as my neutral
that's going to carry it forward so that becomes my neutral this becomes a switching line and this
becomes a switching line as well and we've got a permanent line here so let's just pause let's
think about it we're going to be using the grey for me the wiring diagram i've previously done
also used the grey so let's get rid of those connections first let's fold these out the way
let's bring my Wago 221 in and simply connect those together however remember you've got to
identify your conductors so this is not identified at the minute as a neutral so will require over
sleeving so we'll pop the oversleeve in on so that now becomes identified as our neutral we
bring in our Wago connector and we can join those together so that's that that's our neutral at this
point done so this is our permanent line coming in and these are our two strappers going out so it's
very much like the conduit method now permanent line will come into common and it doesn't matter
which one of the brown and blacks go in L1 and L2 it doesn't matter which way around they go
so neutral is connected the permanent line goes into common and the three core two conductors
which will be our strappers go in L1 and L2 let's do that next so pop my permanent line into common
and then my three core is here i've got to identify now
this black conductor as a switching line so my brown sleeving needs to go over that one
and it's important that you identify your conductors at your AM2S and in industry
so we pop that one in either L1 or L2 i'm not bothered which one it goes in
and my brown conductor in so that's my two way of this
system done wired through the switch permanent line coming in into common my three core i chose
black and brown so black and brown as my strapper conductors i chose my grey to feed the neutral
through to the next switch and that's it connected exactly the same as you did in the wiring diagram
next one let's look at the intermediate CPC's again already connected we're used
to an intermediate switch with two terminals at the top and two at the bottom it doesn't
matter which way around we go as long as a pair from say this left-hand side go in either the
top two or the bottom two and a pair from this side go in either the bottom two or the top two
let's first of all get rid of our neutrals so the gray coming through here now is a neutral
and needs to be identified so by introducing blue sleeving onto it and the grey going out
will also be a neutral connection so that will be our neutral going out and i'll bring in my Wago
221 connector and i'm going to connect those into there so that brings my neutral through this one
so i've got my neutral coming through here and now i've got a set either side so both sides you've
got to set again identify the black as a switching line conductor or part of our strapper system
and then we're going to also double these ends over they won't doubled over
strip those back i always like doubled over terminations so pop those in so this will be
our intermediate switch so we've got the brown and black from the left hand side let's connect
that first again it doesn't matter whether it goes in the top two or the bottom two but we
don't want to go across the sides so it's got to be either the top two or the bottom two drop
those in there you heard me keep my screwdriver on the floor pick that back up connect those up
into my intermediate switch we always like them to match but it
doesn't matter so we always like them to go brown to brown black to black
it doesn't really matter but let's put them in so neat push that down
that's my intermediate switch connected so let's have a look there we've got a pair this case from
the left hand side in the top two and a pair going off to our two way switch again at the bottom
there and we've identified the grey conductor as our neutral so let's go to the last one which
again is our two way switch but we've now got a different cable in it because we've got the one
going up we know that's going to be the neutral we know our grey brought our neutral through
so we move those about i'll bring in some blue sleeving so i can identify my neutral
remembering it's this gray one here which can be identified as our neutral connection and we're
going to put it again in a Wago 221 connector i know i've shown on the video before switches
from Schneider that actually have a neutral connection somebody said they also do them with um
Hager so there's our neutral which now makes its way up here
in order to get up to the light fold that one out the way we've got our strappers coming in
so let's pop brown sleeving onto our black one to identify as a switching line conductor
and this one will go up to our light points i'll be our switch one so
that one there is important we get in the right place that's got to go into common
that goes into common of our switch and then it doesn't matter which way around
the other two conductors go for L1 and L2 so pop that one into there
and again these go in L1 and L2 it doesn't matter which way around they go
but we've identified all our conductors
and that's our two way switch finished off in there a little bit copper shown on the bottom i'm
sure somebody will mention that okay so that's our two way switch and there's our neutral going up
so we've got our switch line our neutral and a CPC making its way up to the light point so that is it
that's how to connect the switches when we're looking at the wiring system wired through the
switch so we've brought the neutral all the way to this end point so we get it up to the lighting
point let's have a look at our connections now our batten lamp hold it could be a ceiling rose
and pendant could be down lights so we've got our neutral connection against the side of our lamp
we've got our switching line connection against the side of our lamp and as it's a fully insulated
fit and we've got our CPC connected in the back here so we're all now connected up
with this different wiring system for two way intermediate so there we have it wired through
the switch let's just do a small recap so our permanent line neutral and CPC came into the
first switch that permanent line goes into common and this is what we usually do when we wire in PVC
singles using the conduit loop in method because at the last two way switch out of common
we had our brown switching line conductor that went up to the light point and then between the
two way switch and intermediate we brought those other two conductors the strappers through there
we also brought the neutral through so a neutral that came down to here connected to
a grey conductor identified with blue sleeve in that found its way all the way to the last point
so it could take the neutral up to the light so therefore we've done the system wired
through the switch that could well be used AM2 and AM2S and AM2E but always remember
there is a chance they can change their assessment so make sure when you go into your assessment
you're comfortable with all the wiring systems so you can do the best you can on that day
also another top tip make sure you go on the pre-preparation day so go there a week or so
before and get some preparation done because you might find there's one or two bits you
might struggle with so hopefully this video is linked to that wiring diagram and giving you a
little bit more insight about this method wired through the switch in order we have two way and
intermediate switching that could be in your AM2 but as always i hope this video has been some help