so in a previous presentation we looked at installing the uh boxes onto the wooden
board using counter sunk screws making sure they're level with an even gap now we're going
to continue on the first fix by introducing the cables our cables have been used before
therefore we've got to have a little bit of extra work in order to get them nice and flat and smooth
before we start and then we're going to secure them to the wooden board this is the first time
we've clipped any cables so it's the basic techniques required to bend and clip pvc pvc
twin cpc cables or pvc twin and earth if you're on site we're going to start off accessory number one
accessory number one is going to be simulating a lighting point and that lighting point is going
to be wired in one millimeter squared pvc pvc twin cpc cable simulating a switching line and
neutral going to that accessory often on-site 1.5 millimeter square cables used because the amount
of thermal insulation used in domestic dwellings before we start we've got the cable and it could
have been it's hung through a ceiling void or been in place through a floor and there's kinks
and bumps in it no different to our cable which is second hand so before doing anything with it
i need to run my hands through the cable in order to remove as many of the bumps that i can before
starting the dressing process so two or three times through with my hands to get it a little bit
smoother before i do the following take my cable now and i'm going to hold it onto the board
and i'm going to drag against the board so if i hold it onto the board i'm going to take my four
fingers and put them underneath the cable with my thumb on the top and i'm going to pull against the
cable against the surface okay ours is a wooden surface it could be a brick or block surface
in order to get it to not stick necessary but lay flat right against the surface it's still itself
so four fingers on the bottom thumb on the top hold it at the top with my arms out the way
for the demonstration and just drag against the actual board itself so i'm gonna do that several
times the full length of the cable for me and if i hold it top and bottom now hopefully you
can see that that's fairly flat to the surface of which we're working with i'll do it again
four fingers underneath thumb on the top and drag against the board itself
so i've got my cable dressed and reasonably flat against the surface in this case a wooden surface
for my exercise i'm going to need to put a 90 degree bend in at the top at the moment being the
first time we've ever clipped pvc pvc twin and cpc cables to a surface i just want a nice smooth bend
we'll cover the bending radius and acceptable bending radiuses in a later presentation
so just make sure it's nice and flat and look at doing this smooth bend i'm going to take my
fingers and they're going to be on the outside and my thumbs are going to be on the inside for this
so somewhere near the top of the cable leaving me plenty to go down into the accessory
i'm going to take my fingers on the outside of my thumbs on the inside and i'm going to pull
once and then move my thumbs up slightly pull again and move my thumbs again so i've pulled it
in about three positions in order to get hopefully a smooth 90 degree bend which we can still work on
back on the board i'm going to drag it again against the board making sure it's super flat
i'm just going to check my 90 degree i'm happy with that i'm now ready to
put it into the actual accessory box itself so i can go down into the box
and i'm going to position it so the bend for my exercise is reasonably close to the top giving
us the maximum amount of clipping on this wooden surface but we've now got to get it straight and
clipped appropriately with our nice smooth bend so let's have a look at the clipping process next
so my cable is now into the accessory i've got a smooth 90 degree bend on it and i'm trying to
get it straight uh into my accessory itself so in order to make some adjustments i'm not going
to fully put my clips in just yet i'm just going to pin them into position the clips are pvc pvc
one millimeter squared clips okay and they're grey the same as the cable itself so just get it into
position just take a few moments i like my clips to support across the bend not actually on the
bend but the first straight point either side of the bend would be my clip in position and i also
like my nails to run in the appropriate order at the moment just pinning it into position so i can
make adjustments if i need to equal distance across the bend on the other side so if i was
to split the middle of that bend the clip would be even distance this way and even distance that way
okay i can make a small adjustment if i'm not happy with my bend and put the clip back in
which would be about just about a little bit
now i'm looking to come down straight into the accessory so have i got to make any adjustments
does it come down straight sometimes thrown off by the wooden board line but i'm going to make
sure it looks as straight as i possibly can and my last clip is going to go within about
15 to 20 ml of my accessory itself not too close because obviously if i miss and hit
the box there is a chance i'll break it so we're just checking that and we'll pin that one in place
if i'm happy with those i could leave them or if i wasn't happy i could just take out the
clip wiggle it out with my fingers and adjust its position move it over or back okay so not
at this stage i'm not hammering into the wooden board because adjustments would be very difficult
i step back and have a look am i happy is it straight with a nice smooth bend if the answer
is yes then we can go with that that clipping distance there at the moment is just one that
we're presuming again we haven't looked in the regulations for the maximum clipping distances but
because this is our first exercise we're probably going to halve the distance i like that distance
for a clipping distance this is a first practice exercise to help us get it a lot straighter we're
going to put one in the middle of that position just take my tape measure i measure between the
center of the two clip positions so the middle of the clips and then i halve that so i am going
to be about 18 centimeters or 180 mil and again drop the foot in and again i check it before doing
anything else just pulled it slightly across there to make sure we are straight down again pin it
i like the nails to run up the inside and fold it round the inside of the bend and if we carried on
would keep going okay i haven't got the nail on this left-hand side for me obviously right
hand side for yours look i've got the nails running up the inside and round of the cable
i prefer that for supporting the cable especially where we go horizontally if i'm happy with it at
this stage i can now put them in but before we bang those clips home we must remember to wear
goggles it says on most of the boxes of clips the goggles should be worn because
these nails can shatter especially when we're clipping them into the course of brickwork so
we're going to make sure our goggles are on and now we can send home these clips
at that stage hopefully we've got the cable coming straight into accessories a nice smooth
bend so we've completed the first fix for stage one we've installed the box we've dressed the
cable cables flat to the surface and the clips for me at college are positioned so the nails run up
the inside and round so we support it horizontally it's nice and flat to the surface it's got a
smooth 90 degree bend possibly the center clip in the real world wouldn't be needed we've added it
in because this is the first time we're clipping pvc pvc twin and cpc cables to any surface
so i expect it to be flat with a smooth bend and straight um on the surface that we've
chosen in this case a wooden board so that's the basic clipping process that we're going to
use here at college in order that we install our cables correctly to in this case a wooden surface