our case our students they returned the circuit breakers the neutral bar and earth terminals to
the appropriate torque setting yep Joe where would normally get that information from well generally
speaking when you buy a new enclosure you'll be given some instructions like you've got here
however what this gives you is for the MCB's it tells you that the recommended tightening torque
is 2.0 newton meters to 2.5 Newton meters so we've got a range within there so the question naturally
arises well what's the actual setting is it to two two point one do you put do what what are we going
to go for ok and when we look at the circuit breakers that we've got in our workshop the
ones that we've had in there for more probably had these for 18 months kicking around in our workshop
there is no additional information on the actual circuit breaker itself he's telling us the B type
it's telling us this prospective short-circuit braking capacity 6,000 amps all the general usual
information on it it was pointed out to me by one of my learners that when he got out a new circuit
breaker just delivered in the last couple of weeks Joe it has some additional information on yeah so
if we look on here you can see quite clearly that it says above the just below the screw terminal
there it says the tightening torque is 2.3 Newton meters 2.3 Newton meters now don't be confused by
the fact that this says 2 comma 3 that's sort of a continental thing where the comma is used
as a decimal point but 2.3 Newton meters is the setting so we've got to the installation we've
got a circuit breaker out we perhaps haven't got the manufacturers instructions if we've got
the manufacturers is not enough information may require us to go into their website but look at
that the beauty is we've now put the information actually on the side of the circuit breaker in
which then we're going to install so we're going to cut away now to an actual installation where
we're going to put a circuit breaker in and do it to the required 2.3 Newton meters of torque
so we've set up the top screw driver a couple of times on camera before but we're just going to do
it again just so that we've got this absolutely clear we can see in the little window on our
torque screw driver there we've got two Newton meters as the current setting we want to get it
to 2.3 so we'll just remove the insert and then what we do is we put in our torque setting tool
so we just insert that into the torque screwdriver and then we're gonna twist this until we get the
right value in the window now on this particular model of screwdriver you can see it goes up in
degrees of 0.2 so we go from two point two to two point four we want to be two point three so that's
going to be midway between those two points so we've gone past two point two to two point four
and come back again so that now has a setting of 2.3 Newton meters and we're ready to use that to
set up our MCB to the right tightness so Joe we got the talked screwdriver set up to two point
three Newton meters of torque and you just going to pop the star breaker in for me yeah it's the
starbreaker design which is obviously just to push fit tight connection so that's really nice I just
hook that over the top of the breaker top of the bus bar and then we just push it in at the bottom
again if you haven't absolutely forced that home you've not got that blade lined up correctly okay
and what we'll do is we'll just pop the terminal open and pop the wire in there put the conductor
in that and then we'll just tighten this up to the specified torque setting on the screwdriver
so I'll get that up to there and then give that a bit of a twist until it clicks like that now
we know it's tight and we'll make sure that we've got our tails to the right torque setting as well
getting our determination to the torque so the terminations for the tails are 2.3 Newton meters
what we should be talking in these so exactly the same as the breaker that we've just done
absolutely yep so we've got 2.3 all across the top there which is really nice I can see the circuit
protective conductor and the neutral conductor are not connected today at bars either that's
correct so what we'll do is adjust the torque setting on the torque screwdriver so I'm going
to set that up to one point seven and again we can't actually see one point seven we've got
one point eight and one point six so what we do is just get it between those two and that's now
set to one point seven so in between those two settings put the drive a bit back in and then
we'll just pop the CPC back in there okay just hold that in place make sure we're not screwing
on to the insulation and we're screwing on to the copper conductor then we'll make sure
that's done up tight so that's now set to the right torque setting I'll just check that my
main Earth coming in is also to the right torque setting so that just needs a little bit more there
we go and I'll put my neutral in as well and again that's one point seven you and me as I'm
here there as well so again just give that the right click there we go now it might be a good
idea when you're doing this to perhaps especially where you've got cables that are made up of more
than one conductor in there just to give those maybe a little bit of a wiggle a little bit of
a wobble so they settle down because sometimes the conductors can kind of spread out a little bit and
if that's happening we want to make sure that we're not loosening the terminal so again if we
just tweak the torque setting on our top screw driver so you're going back to two point three
Newton meters of torque yeah that's what we're aiming for there we go got that set and now we'll
just make sure that we've got this absolutely as tight as it needs to be so that was it slipping
into the screw driver head not the there we go so that's nice since right now and that's nice
and tight as well so we got a little bit further on that that time just by giving those conductors
a little wobble so that's now ready to power up once it's been tested and we're good to go okay
thanks for that Joe so we can see the importance can we I'm actually returning the terminations to
manufactures torque settings absolutely because again there's a there's a trend in the industry
isn't they absolutely halt on that until it's tight as tight can be but it is possible to
over tighten terminal which actually can lead to it being a weekly connection rather than a
struggle and all I learned is both at level 1 2 & 3 we'll be using our torque screwdriver in every
consumer unit they install it absolutely and now the Crabtree have put the torque settings on the
side of the breaker yeah it makes it easier for everybody to know the actual talk saying
yeah it's great shall we in this video that's in the video we hope this video has been some help