we're going to continue on our conduit loop in method so this method is used when wiring lighting
circuits in either things such as steel or plastic conduit and we know when we're doing that we're
using single insulated conductors that can go to exactly the right positions which we need them to
do we've got this booklet here this booklet here is downloadable in the link in the description
and we're working our way through it in our introduction series we looked at circuit diagrams
and those circuit diagrams can be used to help us do a wiring diagram so we took this circuit
diagram here of a one-way lighting circuit coming from a consumer unit through our fuse
to a one-way switch from our one-way switch to our lighting point and then from our neutral
in the consumer unit directly to our lighting point this circuit diagram helped us produce
this in part two of the introduction which is a wiring diagram from a consumer unit to our
first light switch controlling our lighting point here we're going to extend this on in this video
as we move through this booklet i've given you the opportunity to perhaps build or have
a college something like this and in stages one two and three from the consumer unit we
have light "A" controlled by switch one one way in the second say office we have light "B" controlled
by switch two and so in the third office light "C" controlled by switch three and they're all one way
so when we look at this drawing here which we're going to work on today we can see that we've got
uh switch switch and switch light light and light and our consumer unit and we can work on
doing the wiring diagram based on the knowledge that we've got here so we're going to take this
and extend it on by doing this wiring diagram it will help you when wiring the conduit loop
in method on a rig similar into what i've done or start the understanding process of where we pick
our conductors up from in order to get to each of our locations each of the switches in here will
be one gang one way so we'll have a common and L1 termination within them and these could be things
such as grid switches they don't necessarily have to be plastic light switches which were familiar
maybe within a domestic dwelling so we've got a consumer unit lighting point "A" and switch 1 "B"
and switch 2 "C" and switch 3 and we're going to do the wiring diagram using these pvc singles on
our drawing taking the conductors exactly where we need them to go remember that the conductors
themselves for this are a minimum of 1.5 and they are stranded conductors for greater flexibility
when pulling them in through the conduit system so there are things that can come up
as exam questions in multi-choice exams so in a minimum of 1.5 so we're going to be using 1.5
at my college we're going to wire light "A" and switch one "B" and switch to "C" and switch three
using the conduit loop in method these are blank at the moment so i'm going to make
them look like one-way switches by adding in a couple of terminals so we've got common and L1
in those three positions we make the top one in each case common
you're going to make a much better job of this than i am uh you'll have more time to root your
cables neatly around hopefully you'll be following along as i do it in order that you can think well
yeah i can see logically now where Gary's putting these conductors so when you get into the workshop
it makes it easier to wire using the conduit loop in method let's start with the easiest conductor
probably of all to do and that would be the neutral conductor again you can see i've got no
connections actually up here where our baton lamp holders are going to be and i'm sure i've brought
one in on the screen for the type of batten lamp holder going to fit here it will only have
three terminals in it so let's make that as well so let's bring in here a terminal and a terminal
and then maybe we'll make the cpc one down here so let's bring those in a couple of terminals
and cpc a couple of terminals okay again because these are batten lamp holders it won't matter
which one's line and which one's neutral you may want to label them and we've got our cpc
connection in the three points as well so line and neutral so i'll be switching line and neutral and
our cpc at each of lighting points we've got our cpc terminals down here and we've got common and
L1 as we're in pvc singles the blue neutral can go exactly where it's needed to go and if we look at
our original circuit diagram we went from the consumer unit directly to the lighting point
so the first one within our consumer unit we can go directly to the lighting point itself
this will be where our line connection is this will be where our cpc is and these here which
are marked L and N are actually where the tails are connected it's gonna be circuit number one
so i'm gonna come out the top here number one there and number one there for our cpc
and we're gonna bring our neutrals around and into our points so again yours would be considerably
neater than mine because i'm sure you'll pick a better route than i am so our neutral needs go
directly to our lighting point itself exactly the same as we had here from the consumer unit we went
directly to our lighting point so now we need a neutral at this one and the neutral this one
which are in offices two and three well we could come from here and bring our neutral round to here
but that doesn't make sense because it might mean that we'd have many neutrals within our consumer
unit and that's not good practice so we're going to bring our neutral into our second room from the
nearest point we can get a neutral which would be in this light fitting just here so this means we
just take a neutral through from here into there so we bring another pvc single through from this
neutral connection in the lamp through to this one in here and we repeat the process as we go into
the third office so that's our neutral connections in pvc singles using the conduit loop in method
from the consumer unit to lighting point one we then go across the lighting point two and lighting
point three remember these are individually separate from each other so office number one
controlled by this switch office number two office number three
so it's not a case of these are all going to come on at the same time we will look at that
in other drawings bringing more than one light on using this method from a switch but we're not
in this one we've got three separate offices let's start now looking at the line conductor
in our original circuit diagram that we drew in our first part of our video of the introduction
we went from the consumer unit to the common of our switch so from the consumer unit into
the common termination of our switch and then from the switch we went to the light itself
so that's pretty simple from the point of view we're going to come out of here which
is probably a 6 amp circuit breaker we're going to bring it down to the common of our switch
and then we come from a separate conductor back to turn on our lighting point itself so
let's bring that round so we bring our brown pvc singles probably 1.5 straight down to the common
of our switch and that's exactly what we had here from the consumer unit to the common of our switch
now we need to turn it on so when this blade of this switch is operated so in other words when
we make and break the switch we'll expect the permanent line connection to either be
on or not be on here and that gives us a switching line conductor which comes back to our lamp itself
so bring a separate 1.5 pvc single back and that goes directly onto our lighting point like so
so all of a sudden now when we make this switch we'll have a completed circuit
with a line conductor coming down to common we close the switch switching line on the side here
on the other side of the lamp we have a neutral so we've got a switching line and neutral
therefore we have control over this lamp if we've done it in a fully insulated system maybe we
use plastic conduits for all of it you'll find that at the plastic switch and plastic conduit
sections you don't need a cpc but we know that we can change plastic items for metal electrical
items then being exposed conductive parts and they need to be connected to the cpc so we're
going to run around with our cpc at the same time in this video i'm only going to leave it as green
and then previous wiring diagrams i've changed it to a green and yellow so make
it look more like a cpc but to make it easier for me i'm going to do the cpc in just green
let's think about it logically now so we're going to come from the consumer unit there is a earth
terminal in here and one down here would it be logical to get say come from the consumer unit
all the way down to here and back again or would it be more logical to come from the consumer unit
to here and drop a separate one down to here that's why i never included the cpcs on our
original circuit diagrams because they need to take the shortest logical route they can in
order to save cable example being this drop down here in an office might be seven or eight meters
so would you bring it all the way down here seven or eight meters to bring it back up again probably
not you'd probably drop a cpc here and a separate one down to here let's do that next so out of the
one position number one number one number one we're going to bring our cpc first of all up
so you see how your drawing will be probably better than mine into our batten lampholder and
from our batten lamp holder a separate separate green and yellow conductor now is going to be
brought down to the switch itself so we're going to come out of here and we're going to come down
with a separate cpc into here so consumer unit is now wired we've got one neutral one cpc get
it right GAZ on one line conductor all in 1.5 millimeter squared pvc single cables and we've
taken our permanent line directly to common from switch line to our light fitting our neutral
has been dropped off at our light fitting and our cpc has made its way round to the required points
all we need to do now is replicate this into office number two we've already taken our neutrals
through so hopefully we can see with the green pen in my hand that we can do the same with the cpcs
the nearest cpc here is the nearest one to the lighting point in the second office so
let's just bring a cpc through like so and let's repeat the process let's go again through to here
that means that maybe a single drop down to here in a single drop down to here
cpcs will be finished in the next two offices so let's bring that one down to earth the back of
this box and we'll do the same here ignoring this one here i do that often on my rig that i've built
this box here we just ignore that it's in place it's to stretch learners later on where we've
got four switches three lights etc so at the minute we're doing these three offices
independently switched by one-way switches our cpcs are now in our neutrals are now in
so this isn't a very difficult task using pvc single cables we can take them wherever we like
where do we pick up our permanent line connection that needs to go into the common
of our switch so we need a permanent line well we know that that one there
inside the consumer unit is a permanent line connection but that's quite a distance away
this could be 15 20 meters away so again we want to use the same principle where is the nearest
permanent line connection we have that nearest permanent line connection is inside of here
would it be the common or would it be the L1 well we know we took the permanent line connection into
common so it seems logical if we come out of here with a permanent line connection into this common
we can then just take our switching line back to turn on a light and we can repeat the process
when we move forward so let's bring in our brown pen and it's going to get a little messy now so
hopefully you're doing yours using rulers and planning it out better than me we need to bring
a permanent line connection from here and into here so if i'm steady i'll come out the common
i'm going to bring it directly up this conduit here i'll bring it through here not going to drop
it off at the lighting point itself because these are in pvc singles and i'm going to
bring it into the common connection there so my permanent line from this common comes into here
i need to turn on this light fitting so i take a switching line out of here and i bring it up to
turn on this lighting point there so now we've got two independently switched so this is a one-way
switch in office number one one-way switching office number two independently switch from each
other using the conduit looping method to complete office number three we do exactly the same
we need a permanent line at the common hopefully we can see now that if we come out of here
we can bring our permanent line into this common and our switching line back so let's
do that next so bring out a line out of here permanent line connection bring it through here
and bring it down to our our switching line comes out of here and we'll turn our light fitting back
on so we bring a switching line out of here and we go up onto the light fitting itself
we've got a cpc at every point in circuit ignoring this point here we've got our neutrals at the
positions that we require them to be at which is the lighting points and we've got our permanent
line connection into our common and our switching line out of L1 and we use this common to loop in
to each of the other common points that we need a permanent line connection
so we've taken this drawing here of a circuit diagram of a one-way lighting circuit
we've used the knowledge we gained in that video in order to do a wiring diagram
and this wiring diagram will help us if we were working through this book here might be something
you build at home in plastic conduit so when we look at exercise stage one two and three it's
one controls "A" two controls "B" three control "C" and we've actually done the wiring diagram
to help us do that if we wanted to we could go on and carry out the tests there are a page for
parts one two and three or stages one two and three you can fill out your test result sheets as
well if you've built it in real terms so this here is the conduit looping method looking at repeating
the one-way switching that we looked at in the second part of the introduction this time we've
got three one-way switches controlling separately three lighting points in three different offices
using pvc single cables single insulated 1.5 stranded conductors when wiring in
things such as plastic conduit we can also wire in trunking etc this style of cable
as well so hopefully this journey continues on as we develop this series we're going to look
at doing uh more than one light controlled by a switch we look at two-way two-way and intermediate
and we're going to add more and more of this knowledge that we're building up through the
series where we're taking the supply to the actual common terminal we bring our neutrals directly
into our lighting points using pvc singles so as always i hope this video has been some help