Gaz we're going to be looking at fault funding on that dreaded ring final circuit okay so we've gone
systematically through our dead testing and done continuity of CPC of the circuits we've got to
the ring final circuit and which test is that not sequence that's test number two okay and where are
you finding the issue so we find out on stage one of our continuity of our ring final circuit okay
which is that end-to-end test between line neutral and cpc okay I'm which one no you got issue with
so our line and CPC values were fine okay what we would expect with the calculations we produced but
it was our neutrals that we had no readings we have an open circuit on our end to end on our
neutrals true okay often at asses pieces for EAL and City and Guilds you have to identify the fault
yes yeah yeah agreement not yet so it's probably a case of that might be you might say to you
instructor I've had an open circuit on my neutrals have no continuity during stage one of the ring
final circuit test and that might be enough for them to tick that off and then they might switch
the fault out of circuit so you can carry on testing as normal okay that's good but we're
gonna go on and we gonna see the faults I will show you that we're going to open ended circuit
on the neutral and then we're gonna try and systematically find where it is yeah we are
you look at the process to actually locate in the fault in the circuit itself not just at the
consumer unit okay so we'll bring the camera a little bit closer you can see what we're up to
and we see if we can identify the socket outlet that has caused us the issue okay then Marcus can
you show us the test that you're gonna perform and hopefully this neutral issue that you suggested
in the start of the video for me please yeah definitely Gaz so we're gonna do stage one of
our continuity of our ring final circuit now that is our end-to-end values between line conductors
neutral conductors and CPC conductors now I'm going to measure between my end to end for my
line conductors remembering this is my little r1 reading and I get a reading of 1.01 ohms I'm gonna
go into my cpc's next because this is twin and CPC cable so we would expect this to be one point six
seven times greater than the reading we got from our end to end line conductors so if the maths is
right this should be about one point six seven Wow pretty bang on I'm then going to do the end
to end of my neutral conductors remembering that I should get a very similar result within 0.05
plus or minus of my line conductor because we have the same size cross-sectional area and we have the
same length of conductor in circuit and when I've gone to my into ends you will see that I actually
have no read in there so I have an open circuit you elaborate on what you mean by open circuit on
the neutral yeah so the open circuit being where the cable was broken somewhere in the circuit so
it might have come out the back of a socket out layer it might be broken in a wall where someone's
damage the cable okay thank you okay then keyboard warriors this is a training rig and yes it looks a
complete spiral mess in here these cables come in they go out they go in there come out five days a
week so ok apologize for that in advance with that in mind Marcus I can see one set here from the
ring final circuit on its own I can see the CPC and you've connected together the line and neutral
what's you thinking behind that so what we've talking about about splitting into two radials
that's what we've now done with identified both legs split them apart and we're doing continuity
between our line and neutral remember we're not actually were necessarily worried about the values
of the minute we're just using it as a means of identifying where the break in the circuit is so
we've linked one leg together for line a neutral and left this one disconnected for the time being
so then we're going to go round with our plug in tester we've got in the top of our tester is that
a 1730 well you've got all the big stuff out and we've got in the top here we've got the conductors
being the red and blue conductors in there and you're gonna measure at the socket outlets if
I get to a socket outlet that has no neutral in it will they'll receive a reading no you want so
we're trying to hunt down the missing reading we are for the time being okay pull back and
have a look at that okay then so you've shrunk Marcus which is quite funny on camera what you
didn't do for me now so what we're gonna do now is now we've linked them in the board line and
neutral we're gonna systematically work our way around the circuit so plug in and I'm gonna check
my tester see if I've got continuity between line and neutral and i have now a good thing about the
radial is we can start to work out how maybe the circuits been wired through testing because as
we go around we know that with added resistance into the circuit so the resistance should increase
the further we get away okay so that's that's considerably further away than socket number
one yeah there's no need to do both sides are like that your haven't bother doing both sides this is
just a hunting fault thing yes so as you can see now I've got a good idea now that this is being
wired this way okay because its going increasing in resistance again its increasing okay ah no
reading and again I'm just gonna check this one and again no reading so what I'm gonna do now
is I have a good idea that potentially these two aware one of our problems is okay now I could whip
the fronts off and just check them too because don't have many sockets on however what I'm gonna
do is I'm gonna link the other leg between line neutral and the consumer unit yeah and disconnect
the leg we've already got connected and then when I test up one of these two I should actually get a
reading up one I'm hoping and that would give me a reference point as to between two places where
the fault bit occurring oh that's really good so if this was a really big ring final circuit yeah
there might have been seven eight sockets now there would get nothing yeah we're gonna chase
the fault the other way down the other leg I like it very good so let's go back to consumer unit in
connector so back inside to consumer unit can see you've disconnected the connector block that was
on this one here between line and neutral CPC still disconnected we come over here the CPC if
this leg is disconnected the line and neutral are connected together and you're going to do
what next so I'm gonna work my way back round the circuit for the sockets that I didn't have
a reader okay so we'll go back and we're gonna put on two sockets to test and hopefully you're gonna
magically identify the one with the forward yep okay they're magic Marcus find me that fault so
now I've linked the other line and neutral from the other leg in the consumer unit I'm now gonna
plug into my socket outlets that I didn't get a reading from before so I'm gonna go to this
one first and as you can see I've got continuity between line and neutral and again this socket
I do not have continuity now what that tells me is because I had continuity here and I have
continuity hear my break is actually in between these two socket outlets so just from testing
without having to take all the front covers off we've actually located between two reference
points where that fault lies in the circuit now that could be in a wall it could be a joint box
in the floor it could be the back of the socket outlet I'm not going to go and start ripping up
floorboards before I check this socket outlet because this is my point of worry at a minute
so let's take the front off and see if magic Marcus has found the fault so I'm just gonna
whip the front off of the socket outlet that I believe could have the problem in again at this
point I don't know the problem is in this socket out just from my point view I hope in buried in
that wall because we're gonna take the rig off the wall yeah and again I can already see as I'm
and screwing this and levering out my neutrals are actually popped out of the socket outlet so
yeah what a great way to find the fault we know there's other methods of finding faults similar
to this and when one neutrals connected and one is and for us this is at the level we're at with our
level three learners in order to fault find and that was very well explained thank you Marcus so
that was fascinating Marcus can you explain what's so important in a college environment yeah start
to master testing and fault finding again Gaz our apprentices at the end of their five three five
seven or two three five seven testing units they have an end point assessment they also
have their am2 or am2s when you're doing your two three nine one all of these have a fault finding
in element to them and we've got it in control conditions we have yes in the real world would
we suggest as other ways to do this of course there is there's always another way to do it
you know I'm not suggesting that we couldn't do it testing live and different other ways
but for our apprentices they're not gonna have the opportunity to do that in their end point
assessment so we show them the way to find through dead test alone be careful in the comments is what
we're really saying that those are other ways of carrying this out this is a controlled environment
within college and by all means share them with us you know everyone has different experiences and no
fault is the same so it's good shall we end it yeah yes we hope this video has been some help