so we're in the electrical workshop it's my absolute pleasure to be joined by Emilio and
it's monsoon season so no doubt you'll hear the rain pitta pattern on the roof
one of your learners Emilio has produced this rig for us but what are we going to look at today
so basically today Gaz we've got a radial socket circuit here yes which is feeding a
switch fuse spur which allows us to spur off that into a light circuit right okay so let's
play that back so i've got a socket circuit at home this one's an A3 radial however it could be
a ring final circuit and you're telling me from a socket circuit i can install a lighting point
that's right yeah where would i maybe look to use this in order that i had a socket and maybe
i want a light what sort of locations would that be so for example if you in your garage your shed
if you have a socket there you can spur off the socket into a switch fuse spur and then install
a light okay well let's break down the circuit and look at some of the cables and see if i can catch
you out so we've got a 2.5 millimetre squared cable here feeding the socket outlet that's one
or more if it's an A3 radial we've only got one on this little test rig what size cable is it here
going into the fuse connection unit so we also have a 2.5 cable feed in the switch fuse spur okay
and that will go into the in terminal or supply okay and i've got a funny feeling that is not
2.5 Emilio coming out there what size cable is that so there we have uh a 1 mil cable yes um
the reason we can use a one mil cable or not two five is because we've de-rated the fuse to a
three amp cartridge fuse that's in here no it's in here so so oh so you've replaced the 13 amps
standard we'll be checking that at some point we've replaced the 13 amp standard fuse that
comes in a switch fuse connection unit and you've replaced that with a three amp fuse
okay and that means that we can go out in one millimetre square cable to feed our lights
i quite like the thinking behind that so let's say that this light here was maybe an outside
lighter garage light whatever it is it requires a little bit of maintenance so we can see it's
clearly working now but let's say we needed to to replace it or maintain it how am i going to
go about that okay so if you wanted to change the fit in yeah you could isolate the light
from this switch here so if i just switch it up there see the light's gone off okay um so and then
isolate it securely and safely you can undo this screw here yes this little insert comes out pop
out the fuse and a little padlock to lock it off nice and safely so so that means i could leave
every socket on in the installation yep maybe it's in the shed but every socket can be left on
i can change the light fitting because i'm not going to perform the safe isolation at my 20
amp circuit breaker i'm going to perform my safe isolation at the fuse connection unit i quite like
that i think we're going to bring the camera in a little bit closer i think we're going to you're
going to show me that you've got a three amp fuse which i'm skeptical about so um we're going to
show you that 3 amp fuse we'll perhaps lock it off and then shall we use our approved voltage
indicator and prove that the supply is isolated yep cool so we just swung the camera in a little
closer we've isolated the double pole switch here on the switch fuse connection unit but you said
to me you're going to remove this fuse as part of the isolation process we've seen the light go off
can you just open that up for me Emilio yep so we're going to use this key to open this set
here okay it's a quarter of a turn okay i'm trying to keep my hands out of the way yeah it's always
difficult to get out the way the camera everyone says oh i don't know how you're doing let's try
that out then we'll use this side just to flick it open okay so you've got that trying to keep
yourself out the way the tripod okay great oh that looks red is it a three amp and then just to prove
i get this up
okay it's a free amp fuse BS 1362 okay so we've got the BS 1362 so you prove yourself right okay
yeah Emilio's give me a master class off camera there's a little hole up here i'm going to attempt
from behind the tripod in order to put a padlock and a sign through here so if you want to pass
me it thank you Emilio so here we go can i do it with a tripod in the way so there's a little
hole at the top here which i've got to get through got it through there and then i just clip the two
together and hopefully i've secured the isolation there kind of push it back into place i can't and
there's no fuse in the carrier either so i've got my sign on it i've safely isolated here and
Emilio is going to show us now how to prove it's dead at the actual lighting point itself remember
to keep the keys from the padlock on yourself at all times so before we use our approved voltage
indicator Emilia what you're going to do so we're just going to make sure that the voltage indicator
is um still working okay so we're just going to probe it into the proving unit okay brilliant
it's been flying around in the back of the van and i can tell you from my side all good
so we just proved our voltage indicator is working correctly can you prove now
that actually the circuit is not live for me Emilio yeah sure so we're going to probe onto
the least dangerous conductor first which is the CPC okay and then onto the line conductor
okay and that's got zero voltage zero volts so off the line off the CPC
now now i'm gonna go between the CPC and a neutral conductor
okay yep zero volts volts off the neutral okay good
the CPC and that leaves us with the neutral and the line conductor okay so
on to neutral first okay brilliant yep and then on to the line conductor
zero volts yeah and then we're off the line conductor and often here brilliant so are you
happy that that circuit now is isolated Emilio yep pretty pretty happy with that
and we've got one more thing we've got to do with our voltage indicator before we we
fully confirm it yeah we've got to test it again okay in the proving unit
so then before we're 100% comfortable that we've isolated this circuit what we're going to do
so we have to prove um the voltage indicator is still working after we've isolated the supply okay
so i'm probing into the uh the proving unit okay and i can tell you from my side
everything's good cool so i found that fascinating this is an exercise that Emilio uses to stretch
is more able learners at level one and level two just go back through some of those key points that
they should have got from the exercise before we please yes so here they have a socket circuit here
which have spurred into spurred off into a switch fuse spur with a 3 amp cartridge fuse which has
allowed us to install a lighting circuit here so the learners that have done basic lighting
circuits and basic sockets have actually brought the learning from both of them together to utilize
the socket circuit in order to have a light on it that's right we also went and looked at the
safe isolation procedure which didn't require us to isolate in the consumer unit where did we
end up isolating it so we don't need to isolate it at the consumer unit we can isolate it here
with the switch fuse spur and the advantage of that meant that every socket in the installation
was left on as we repaired that outside that's right so our first video together we're going to
try and end it in our timely fashion then Emilio so you ready i'm ready we hope this video has been