so it gives me my great pleasure today to be with Marcus and we've got a series of videos
that mark is going to produce for us on Marcus though so we're going to start producing some
videos on fault finding Gaz and different scenarios and what tests we can do to find
them folks i've had a massive load of requests to do testing videos for level three i've
got a massive load of requests for those videos to be concentrating on fault finding and that's
what we're going to do today what fault are we actually going to be looking at today so
today we're going to be concentrating on a fault of a scenario that maybe a customer
has got a tingle off of a gas or water pipe all right okay so there's there's an issue
though that we've got to hunt out and find the fault wouldn't imagine the first thing
we do is grab the water bottle to prove that you get the tingle with that in mind we've
already done some of the stages already haven't we marcus yes we're on our fault finding board
here at the college and we've already done the safe isolation tasks now obviously we
know that's important for certain reasons being if the installation was live and we
disconnected a bonding conductor a fault could appear on that pipe work in the meantime and
we have got a fault we're simulating five the rig behind us has other faults you probably
can visually see you'll be typing away at the bottom in the description what about this
one it's actually a fault board so if you see something it's likely to have been there
on purpose so what we can do is bring the camera in and marcus is going to go through
the stages in order to detect what is causing our issue with this gas or water pipe with
the tingle with getting off of that so you've got your multifunctional tester out and you've
said it to ohms Marcus explain what you're up to now for me so in the scenario of somebody
maybe getting a tingle off of a gas or water pipe we're going to be maybe worried about
the connection of the main protective bonding conductor go into the extraneous conductive
parts so as you can see i've set my meter to ohms okay because i'm undertaking our first
dead test still which is continuous of our protective conductors including the main protective
bonding i've zeroed my leads also okay we've done the zeroing out a million times on the
channel we're at level three at this stage so effectively you're doing the test that
industry likes to call the R2 test but it's actually test method two yeah test method
two okay so to start off the fault finding process we're going to need to disconnect
the main protective bonding conductors from the met and the installation this is to remove
any parallel paths to earth now it's important to remember when we're disconnecting these
conductors that we have the installation safely isolated as we spoke about earlier if the
insulation was still live and we've disconnected these conductors a fault could appear in one
of the extraneous conductive parts so what i'm going to do next is i'm going to go on
to one end of my main protective bonding conductor now in the real world if you like these might
not be as close to the met as they are on our fault finding rig so you might need to
use what we call a long lead or wandering lead test remember this is test method two
and we call that our R2 reader now i'm going to go on one end of my protective bonding
conductor and i'm going to probe onto the pipe work itself
as you can see i have no reading there i'm then going to go onto my gas pipe to confirm
which one it's for and i still don't have a reading therefore i'm worried at the minute
that this conductor may be potentially broken however i need to confirm which extraneous
conductive part isn't getting a reading off of any bonding conductor so i'm going to switch
to my next protective bonding conductor and again i'm going to probe on the pod because
i'm not actually bothered to get into the clamp i'm worried about the connection to
the pipe itself so as you can see to my water i've got a reading of 0.03 ohms now that is
under our maximum allowed value of 0.05
now i'm just going to retest the gas for this bonding conductor because i know that one
should be for the gas and again i've not got a reading now so i have confirmed that somewhere
along the run of this conductor there is a break in the conductor so that's really good
markers i like the way you went through that in a nice clear and concise manner but now
i've got the issue as the electrician i've got to repair that fault how am i going to
do that so with the main protective bonding conductors in this situation it's kind of
a tough one isn't it because unless you can visually see a break in the cable maybe you
know our beloved kitchen fitters have fitted a new kitchen and the the gas meter or the
water meter is under one of the cupboards and they've cut the cable you can visually
see it we don't actually have any reference points where we can break the circuit down
to find that break it could be buried in a wall so in that instance unfortunately you're
going to have to run a new 10 millimetres squared or 16 millimetres squared bonding conductor
depending what installation domestically it's probably going to be a 10 millimeter but we're
going to it could be a 50 million yeah i mean it takes some cutting through but so you're
telling me we've found the fault and and then the fault finding exams you'll take at AM2
and AM2S and as point endpoint assessments for level 3 apprenticeships etc the likelihood
is you only find the fault you don't correct it yes yeah that's correct so that's the first
in a series of videos that hopefully Marcus is going to be doing on fault finding and in
this video we looked at finding a fault in a protective bonding conductor yeah where
it was broken and maybe in the next video guys we're going to look