So in this video we are going to continue to look at the premature collapsing of surface wiring
systems Joe yeah absolutely we've already released a video on this we have and but there's been a few
questions since we released that video obviously that was before the 18th edition landed yeah and
there's been a few questions raised and hopefully we're going to address some of those in this video
and it's a few issues that we had that we were boxing clever with about fixes except there wasn't
exactly yeah so we looked at the Firefly clips and we know how difficult that is for me to say
our next video will be out shortly with that one in so we've got we've got them secured here but
the question that kept bouncing back to me was that's great for surface mini trunking I don't
have that clip what about PVC conduit Joe yeah and it's a fair question isn't it yet because
the Firefly clip doesn't cover that area however actually there is a really simple
solution for that and that is to use metallic clips just like wood used for metal conduit
the only small challenge with this situation goes yeah is what what getting hold of them yeah it is
first involved trickier than you think yeah so we we saw him in electrical wholesale business they
can have some of them and enough throughout as some of the electrical students we've got a level
three work-based learners and they said yes great but they difficulty a hold of so hopefully as we
we progress into the 18th edition a bit deeper we'll see it's a lot easier so all we've done here
they're glossy white rather than the plastic ones here they're glossy white plastic sorry they're
glossy white and metal you know not plastic and the saddles are securely conduit in place
in the event of a fire we expect what to happen to the conduit Joe the conduits gonna melt that's
just gonna disappear cuz it's not fire rated however the cables then that are inside the
conduit are gonna be retained and held in place by those metallic clips which are naturally fire
resistant premature no time allowed for that they just say those early stages of the fire
and that brings us to whether or we can use a plastic wall plug or not yeah so on
the original one that we did here on the video okay we used a walldog fixing yeah we use these
walldog screws which just screw directly in to the brickwork no plug or expansion required okay
so that's brilliant so I know I left for another reason no plastic that's a big thing no plastic
no plastic so again no plastic plug required on them and we push that in that video however
we would then later introduced to the fact that they're saying because it's premature collapsing
that a plastic plug the heat transfer through the fire and the pulling out of the surface even
though it's mildly inconclusive industry are going with plastic plug so behind each of these metallic
saddles Joe yeah I've actually done the plastic wall plug yeah and screw in order to hold them
into place now I think it's fair to say again when it comes to details like that I think it's for
I think it's fair to say that you've got to weigh up how you feel in your own conscience I mean if
everybody is is doing this fair enough but you know for the sake of instead of putting a raw
plug and a screw in put a slightly more expensive screw in yet for my money I'd sort of be awaiting
that up and going I'm on just put just a metal screw in with no plastic that might be the way
that I would go if I was gonna be working on-site as a contractor yeah so it's a little bit personal
preference yeah but it's also a little eye on best practice yeah we're gonna ring the camera
because there was another question about can we get 2 x 2.5 mm2 cables behind the Firefly
clip I have to say so we were in the camera and we're just a little look at that and we'll run
through again those over-over clips that can be used as a retrofit on trunking as well yeah
so Joe we've bought the camera in nice and close and we've got the mini trunking here that we
looked at before where we've got both the over clip and the internal clips that you can choose
from Firefly can you explain that to me please yeah so we've got the two options here we've
got the in in trunking clip now this would be installed if you're putting trunking in brand new
and there's a requirement to prevent the premature collapse of the wiring system so that clip would
be installed and then the cables fed behind that so that would work really nicely and then
here we've got the retrofit type installation so maybe if we need to a building that was already
installed using mini trunking if there was another requirement from the fire office or an insurance
company to provide protection against premature collapse of the wiring system that would be the
one we'd installed because we don't even after open the trunk enough we can just put it over the
clip and that's gonna work absolutely perfectly so that's really helpful to have those two options
just look in what we've got going on here though guess what benefit we see in here yeah I was asked
the question on previous video because we only put one 2.5 mm cable in MT2 trunking can you get two
in it yes you can they comfortably fit in as you can see here and the clip will hold back 2 2.5 mi
cables so we simulated go into a socket before obviously we simulating have been a ring final
circuit we could've had two tables secured behind the clip itself sure we can also see that we're
doing for a range so we've got the ability to use larger trunkings with the internal clips and the
external clip so Marshall Tufflex in conjunction with Firefly provide all the fixings required
whether it be internal first fix or retrofit second fix premature collapse into the wiring
system is secured using a metallic fixing to incorporate the requirements of the 18th edition
so for me no big crisis there I know the 18th edition surface wiring systems cannot premature
collapse in the event of a fire we solved it in trunking we've solved it in conduit okay
by simply just using a metallic saddle yeah and they're quite easy fixes aren't they these are
not really expensive really owners fixes it's just a kind of another thing to add to your repertoire
of things to think about when you're doing your installation work yeah absolutely and then if we
move to cable tray so we can finish it off and you can conclude whether would be yeah so just got an
example of some cable tray here now obviously if you've got cable tray that is mounted like that
systems like my collapse yes you've got all this metallic support going on so that's not
going to collapse okay the real problem arises where we've got cable tray sort of like this
potentially maybe like that yeah be some issue that I've been down a wall coming down a wall
yeah if that falls off there we've got some issues there so again a simple fix we've got to
armoured that we've installed on this tray this is demonstration piece for the learners we can see on
this side we've got plastic tie-wraps cable ties cable ties cable ties cable ties right tie wraps
we've got plastic cable ties going there this piece of SWA and then on this side
we've actually got metallic cable ties going down there bit over the top though so yeah Gary's gone
mad yeah absolutely again we're showing this is this is almost beyond the best practice this is
financially crippling practice because again we've got the issue that metallic cable ties
are more expensive than plastic cable ties but is it necessary for every single cable tie to be
metallic goes no not at all so again they won't give you guidance they'll just say
you got prevented from premature collapsing but I think the electricians professional decisions
going to be probably every couple of metres every metre and a half plastic tie plastic tie plastic
tie metal tie and then we go again my one big thing though is is how well do I sleep at night
if I've secured this steel wire armoured cable to cable tray next to one that was installed
many moons ago and I've secured mine yeah with a metal tie yeah do I sleep well at night
Joe I don't imagine you do you know fantastic my cable did not drop off the cable tray
and then entangle a fire officer okay that one did yeah wait we're not we're not really in the
business as electricians have going you know what just kind of washing the hands of it and
going not a problem you know we want to we want to think beyond that don't really want to really
not just think about our installation but perhaps think about the existing installation yeah you
may argue you don't have a responsibility to do anything about that but again we're looking at
you've got a look at the reasons why we do things you know this is potentially saving a life
is it worth maybe just dotting every couple of me is a metal tie wrap on that and going at least now
that's that's been improved oh well somebody's going to come back at us and I understand why
the table tray is nine hundred mm wide and all the rest of it it's a conversation you have with the
client yeah if it's an installation it's called nine hundred mill wide trade yeah it's likely to
be a very large installation perhaps got a budget and a responsibility in order to make sure that
you put some in in some metallic fixing I don't think we wash our hands of it no certainly at
least you would point it out to the to the the building the person responsible for the building
and just say look my cables fine I'd be more comfortable if I could you know sort of you're
taking these ones and you know start that dialogue yeah there goes y'all so we don't believe this is
gonna be a massive issue okay it's just a change of thinking so we're going to install some sort of
metallic clip over or in trunking we're going to install metal saddles to hold plastic conduit back
in the event of a premature collapse and we're going to consider whether we're gonna use a wall
plug to secure the fixing back or whether we're gonna use one that doesn't require any plastic
and we're certainly going to start thinking about using metallic ties in order to support our cables
it's better so there's options out there there is in the solutions are so Joe things I told are