we're going to continue on our series of wiring lighting circuits using the conduit loop in method
this booklet here is downloadable from the link in the description and we're working our way
through it in order that we can wire a conduit system that i've developed at Tresham college
one that would be very easy for you to build either at your college or maybe even at home to
practice this different way of wiring lighting circuits using the conduit loop in method
remember we're now using single insulated pvc cables probably 1.5 millimeters squared
they're stranded for greater flexibility and they're the cables that we use within conduit
and trunking systems the advantage being that we can take the conductors exactly where we need them
in my previous video we produced the wiring diagram for this which links to the exercise
booklet that i've already given you so here is the exercise and at stages one two and three you have
the first switch controlling the first light in office number one second switch controlling the
second light in office number two and the third switch controlling the third light and say office
number three and that's where we got up to now we developed it from the circuit diagram we've
done in a previous video presentation as well as our very first wiring diagram of a consumer unit
a one-way light switch and a lighting point so this knowledge keeps building on top of
each other and i recommend if you haven't seen the previous videos to go back and watch those
and download in the package will be really helpful as well so what we're going to do now is we're
going to move it on to what is the fourth stage in this booklet so if i find the right page the
fourth stage is that we have lights "A" and "B" so these two here controlled by switch number one
so what we've got here this switch now turns on this lighting point but also this lighting point
here if you think of maybe of a commercial or industrial situation where you're using a conduit
system if you walked into say an office you turn on a switch it's likely to turn on more than one
lighting point and that's what we're looking at here for this process can we develop a one-way
of a lighting point which we did previously in this video here we did this switch turned on
this light can we develop it that we have this switch turning on this light and this light
if you've wired this in a workshop and got it marked off or you're practicing yourself
you can just alter the wiring that is available here once we've done this drawing here you'll see
how logically you can alter stuff and remove cables in order that you can have this switch
controlling these two lighting points but for this obviously we need to develop the wiring
diagram from the knowledge we've already acquired so i'm going to need to alter my drawing slightly
to add some bits in remember we did this in the first one i'm going to need to make a couple of
connections here for switching line and neutral of our batten lamp holder and a cpc connection
at both lighting points it won't matter which way around our line and neutral go as long as we've
got a bayonet cap lamp holder would be different if it was Edison screw depends what you're
using at your college and we've got down here a one-way switch so i need to have a common and L1
so we're going to be using these plastic switches but you can use metal grid switches so they're
also the type that you would probably use in a conduit system so we've got our common labelled
an L1 and we're going to just use the skills from our previous video in order that we can get our
one-way circuit in first and then work out how we can have both lights turned on at the same time so
let's start off as we did before in that previous video doing the neutral so our neutral being here
ah it's single insulated blue conductor stranded we're going to take it to exactly where we need it
where do we need it well we need it up here at our lighting point so let's bring our neutral
and again i'm going to use fuse way number one cpc and neutral number one position so
the earth bar and the neutral bar so let's take our neutral out and we're going to bring that
round from the consumer unit and drop it off at our lighting point itself let's leave the neutrals
for a minute because we're going to add this light on let's just make this one one way to start with
let's do the cpc next so we're going to come out a cpc at the earth terminal in position number one
and i'm going to drop that off in first of all into my light fitting
so in our case a college batten lamp holder and then take a separate cpc down to
the switch itself so there we go our cpcs have gone round remembering from our circuit diagram
that we had in a previous video so we did this circuit diagram here and again checking out if you
haven't already done it we said we went from the consumer unit with our permanent line connection
to common and from L1 to our lighting point itself and we did that in our last video as well
so we're going to come out of here which is effectively probably our 6 amp breaker
and we're going to bring our permanent line connection up not to the lighting point we're
going to bring it directly down to the common and then we're going to bring our switching line back
from our L1 up in order that it can turn on the lighting point itself so that's what we did in
the last video when you look at the first part of that video before we extended it on we wired this
switch controlling this light one way however for stage four of your practical exercise book which
is in here so stage four requires it this switch to turn on two lighting points so this lighting
point here will need a neutral a cpc and the same switching line conductor that this circuit had
let's start off by doing the neutral i think we're familiar with the fact we take our closest neutral
so we take a neutral out of here in pvc singles and we drop it off there where's the cpc where's
the closest cpc that we can get well the closest cpc is here so let's bring that one through
and now we're going to work out when we turn this one on when we close this switch
we put a switching line here onto L1 that comes up and turns on this lighting point here so we could
take our switching line from here come up to the conduit and through to this lighting point just
here however this might be a 10 10 meter drop it might be some distance away and that is not
the closest switching line of this part of the circuit so have a think where would the closest
switching line be to make this light and this light come on together well it's here isn't it
it's just here this switching line conductor here turns on this light
if we were to extend it through into here into the next area the next lighting point in the office
say for instance when i turn on this switch i turn on this light and because i've shared a neutral
across it needs a neutral a cpc across to make it safe and i've shared the switching line conductor
across to here when this lamp illuminates might be a fluorescent light fitting this one here will
also illuminate meaning that this one-way switch now turns on this light and this light
it might be that you want more lights so how do we do that we continue the process on don't we let's
say we were putting this light on it as well we drop a neutral across the switching line across
and the cpc across in these pvc single cables to the next lighting point meaning that this switch
will turn on this light this light and the process can continue so this is building on the knowledge
from a previous videos in this series using the conduit looping method the great advantage
of using pvc single cables are you can take them exactly where you want them to go and you can make
it as logically short as you can as long as you select the appropriate conductor from the position
it was in we did exactly the same in our previous drawing when we linked together our commons
because that gave us the consumer units permanent line into common and that permanent line went
into this common and it looped into this common in this drawing here we've picked up the most
logical switching line conductor neutral and cpc in order to have another lighting point come on
using this conduit loop in system we're going to take it on in further videos we're going to start
looking at two-way two-way intermediate as well as we work through the booklet which is obviously
downloadable in the link in the description but as always i hope this video has been some help