today we're going to look at building an s-plan heating junction box with the Wago
topjob s din rail terminal system
are you obsessed with the s plan heating system i'm traumatized Gary ever since we went to that
uh project when we took over the smart home and there was a little bit of a messy job uh we've
looked at lots of ways of improving it and one of the early ones we did was with the Wago 2074301
i think is the part number and i'm going to go yes you're correct because i haven't got a clue what
the part number was for that and i'm looking down here and i'm not seeing that style of uh
connection box from Wago but i am seeing a Wago product yeah so it was based on feedback so um we
took that fantastic system and showed you how he could uh deploy it in an s plan heating system and
configure it for other ones i'm not just obsessed with s plan but some of the feedback we got from
that was in some instances Gary it's a little bit too big what you're saying that when i get into
that area maybe where a plumber has been that he's taken up a lot of the real estate in there
and left us hardly any room in order to do our connections yeah yeah and then obviously what's
the other problem plumbers sort of have their problems sometimes though we have sometimes have
leakage in electrical systems but they're sort of struggling with leakage as well don't they yeah so
it could be that your enclosure needs an increased IP rating and that might be not necessarily
because we're wondering if their pipe's going to leak but it can be because of higher humidity and
that environment such as boiler houses isn't it yeah so yeah you're not inside a building you're
outside and that happens a lot with some of these more renewable based systems you need an enormous
amount of space big tanks and yeah things do leak from time to time so we thought we'd look at
how we can build a wiring centre right using the Topjob that we've featured in some previous videos
yeah we don't need to mention all those videos as well as one in that collection you don't need to
go back on where i lose well actually i lost the race because i was given the incorrect equipment
so make sure you get to that part of it and you'll agree with me and leave a comment below on that
one i'm gonna have a look at what you're doing here because i think it looks quite neat just
explain to me obviously first of all the enclosure that you use for the IP rating okay so this is a
closure we've featured before from Hylec and we've coupled that up with some quick fix cable glands
okay so the yeah the quick fix cable glands there so lets bring one in just remind me of the quick
fix yeah so again so you don't need to put a lock nut on the back so that creates a very uh
sort of minimal space requirement inside the box yeah we've got what you'd expect to see uh on a
s plan heating system power supply coming in there yep we've got a five core cable going to what
would be something like a Nest Heat Link so it's a combined thermostat and timer and switch for the
water yeah not just off the board then just off the board the wireless after that these are the
aerials um obviously supply out to the boiler to fire up the boiler which works also with the pump
cylinder heating stat and two zone valves for the uh hot water and for the heating
system as well so pretty much a standard s plan arrangement but of course we're using
these here the topjob dim rail connectors shall we just see how we put this box together yeah
so let's start off with a little bit of overkill yeah i've got the Milwaukee force logic out
see how it cuts clean holes in a plastic enclosure i know what people are thinking yet you went in
with a 12 millimetre hole why didn't you just carry on you'd be right but these holes are very
very neat well if you've got one use it yeah so just uh yeah so i'm going to start building up
our topjob din rail terminals the all-important end stop to stop the terminal shifting along the
din rail and then we're going to bring in the earth connection putting the end cap on a lot
of people forget these but that's to obviously connect our earth conductors but also earth
the metal din rail itself okay so that clips in no screws just clip straight into a din rail
yeah i'm putting an intermediate end plate on possibly it's very easy to tell where the earth
connections end and the others ones start but it just creates that nice visual identification
between a different section okay and then we're just going to repeat the process through as you
build it up build it up end cap on and then start a little bit of wiring okay so using the
push variety of these so we've got the ones that use the operating slot and we've got the lever
in order to make your connections onto the actual dim rails from Wago yeah so i mean that yeah easy
for anyone who you know suddenly descends into an alien world and doesn't know what they're looking
at needs to do some maintenance the little push button is very easy to work with you just cut
off a ferrule there yeah so just using the yeah these are class five uh conductors of stranded
conductors you don't even really need to twist them to put them into the topjob terminals but
again just operating tool drop it in connected yeah so finish off the rest of the connections for
this s-plan heating system i think i'll jump back in maybe when you're on that last final connection
so there it goes last one's in place what's next next so just um put some jumpers in so obviously
there's a obviously a neutral we'll use two uh top job terminals we need to connect those together
debate on the earth what do you think obviously the link through the din rail
yeah it can make testing a little bit tricky if you were doing individual circuits of all
the CPC's are linked there and then go back to another area but i definitely need to link the
line of the neutral together and then just putting in some label inserts so these ones you can write
on you need a remarkably fine say sharpie pen in order to write something clear on it and not your
shaky hands so instead i've gone for the i've just printed some off on our brother
label printer now really these labels need to be 11 millimetres wide for that that suggests
where they've probably got a special printer that we need to try and convince them to give us
one one-off so we can do a better job on that either that or it's origami Gary with his
uh scalpel blade so once again you proved that the topjob s range from Wago is incredibly fast
incredibly simple but your rule normally is when you pick an enclosure you generally pick one
enclosure too small for what you actually need and as i look down here you've actually given
yourself a lot of space i've broken my own rule yeah well it's nobody would have completed a job
i wish i had chosen one that's uh it was a size up but in this actually i think i probably could
have gone a size down yeah because i could have obviously brought some of those glands in the
side yeah the glands that need the room not the terminals and shifted them along
now just for comparison right i've got some conventional din rail terminals here so there's 40
connection points in there wow there's a lot there and there's 40 and then if i compare that with a
box so let's get the same size box we've got there and just the lid you will see my rule would have
been right there would have struggled to get those terminals in and allowed myself enough
room to route the wires around and that's the beauty of this system here where we haven't got
just two connections per din rail have we no so there's four per one and then these jumper links
as well are really easy and again you compare them to a standard din rail we've got all these
screw connections to make check out the video where you'll see Gary attempt to make them but
was thwarted in the process you gave me the wrong size screwdriver and that's why i lost the race
yeah so lots of options there uh other options we could have done we could have brought in
some coloured terminals we again wanted to differentiate those neutral connections
well that doesn't mean they don't mean all the colours do they say no i don't know yeah we won't
find a brown one etcetera will we so you've gone with obviously the the standard grey there the
green and yellow for our CPC and you've labelled your terminals accordingly just run this through
the labels yes obviously yeah the e for the obvious the earth the CPC connections the neutral
eight connections there with the jumper link obviously to common these two sections together
there's the line connections but i only actually used one terminal actually so i could have
emitted one right and then next to it there's the connections for the uh for the hot water
system so from our cylinder step from the timer then out to the zone valve the connections from
the heating programmer slash thermostat yeah uh to that zone valve and then obviously the return
from the zone valves to fire up the pump and the boiler which is the p terminal right okay we're
all over that you've done that many videos on this s plus heating system he's crushing it okay
yeah i like that and i love the way we've gone through that system we've shown obviously it
takes up a lot less room but this isn't the only style of dim rail connector that
we can get from Wago in this um topjob s series is it no it's not i mean there's uh
there's an immense range that we've looked at in a previous video did we do a deep dive we did do
a deep dive well no we didn't we scratched the surface because there are so many different um
part number combinations in there so these are just the conventional one in one out terminals
but yeah this this range has lots of options you know obviously you don't necessarily need to use
the push buttons we've used there you could use the lever style we've got the clamps but if this
is so this is the lever style here and this one down here just remind me what tool you need for
this style at the end of the operating tool yeah the old operating tool not a screwdriver
so we've got our conventional levers we're used to seeing on a Wago connector we've got the push
button we saw in this series but we've got the ones that use that operating tool as well so
three different ways of doing the same thing so i recommend checking out that video because
obviously we have a look at it like i said it's an immense range but we also suggest where you'd use
each of those connectors maybe in panel building didn't we yeah and what i'll do is i will leave a
list of the part numbers that we've used in this system you know we love a part number i love a
part number when this system has a lot of them um that is the only difficult thing about this system
is navigating the part numbers um but the reward is there when you get the stuff come through
it is but i'll put a link in the description below if you if you you know if you're using a
lot of s-plan wiring and you want to recreate what we have here and i'll link to those other videos
for the other components that we have as well yeah and as always you'd love some more questions
on s-plan heating systems i think you've even done one where you give people a wiring diagram
you're fully in love with the span heating system however this video was about those connectors from
Wago those dim rail ones are you currently using the topjob s series from Wago as your
go to din rail connector did you not know about it and now obviously you're thinking wow that's
so easy i'm going to start investigating that in the future are you using these boxes from Hylex
or the glands just remind me of the glands it's the quick fix okay which we've liked and we've
got a video of those on the channel as well and it helps ensure that IP rating especially
if you're choosing an IP rated enclosure for your central heating system please leave all
those comments below and s plan heating system over here we'll get back to as many as he can