in this video we're going to look at the connections within a ceiling rose
in a lighting circuit in a domestic dwelling this will link to other videos that i've done
on lighting circuits also the circuit has been safely isolated locked off and proved dead of
which i've done a separate video on that in the past we're just going to look at the connections
and how they're terminated within the ceiling rose in this video presentation
so let's take off the ceiling rose cover and look at the cables and connections
within the ceiling rows in a domestic dwelling we've actually got three twin and CPC cables
and they're one millimetre squared in this case for a lighting circuit and we've got
the following terminations a separate block of two here switching line a centre block of three
which is loop and an end block here of three which is neutral so we've got three twin and CPC cables
we've got the supply coming in so let's say this one here this brown conductor here and this blue
neutral here would bring a permanent line in and the neutral connection into the ceiling rose
the permanent line is connected in the loop section here and the neutral in this block of
three classed as neutral we've then got a cable which is a permanent line and a neutral going out
to the next room so again permanent line out the loop and neutral out the neutral block we've also
got another twin and CPC cable one that we'd probably use as twin brown in the classroom
which takes again from the centre loop a permanent line connection down to the switch
and when it returns here in the switching line section it is actually blue identified with brown
sleeving it isn't a neutral it's a switching line conductor to turn on the light itself
the permanent lines in the centre in the loop the feed goes down to the switch the
switch returns as a switching line against the side of the lamp the other side of the lamp
is connected to neutral in order that we can turn it on and off from the switching line and a
neutral as a return path the three CPC's one from each of the twin and CPC cables are connected in
the earth terminal within the ceiling rose itself the earth terminal is there in case the fitting
is changed for an exposed conductive part in which case the CPC would be needed let's have a look in
another ceiling rose so this time we only have two one millimetre squared twin and CPC cables
coming into this fitting the reason for that it is the final point on the radial lighting circuit and
only has the supply coming in it doesn't go off to another room we still have the same arrangements
of a set of two for switching lines so let's set of two connections here for switching line
a set of three connections for the permanent line in the loop in terminal and three connections
here for the neutral to be connected so the supply comes in permanent line comes into loop
along with a neutral to the neutral block a permanent line goes down to the switch
and returns on not a neutral connection it is blue but identified with brown sleeving
and is a switching line conductor and is connected in the switching line connection here of two CPC's
are both secured within the earth terminal in case it's changed for an exposed conductive part
so we looked at two different lighting points on the lighting circuit we looked at one part way
through the circuit where the supply came into the ceiling rose and then the supply was taken out to
another room and then we finished off by looking at one at the end of the radial circuit where the
supply only came in and didn't continue on to any other part of the circuit actually finished
at that point so therefore was the furthest point in the radial circuit we also got to see that twin
brown wasn't being used as we're using twin brown in my workshop that they had to use twin and CPC
it wasn't a blue neutral returning from the switch it was actually a switching line and
we can see how the electrician this installation identified that with brown sleeving this along
with other videos on lighting circuits are where our knowledge is going to next we're looking to
extend that knowledge in the first 10 weeks of our learning i hope this video has been some help