On-Site Consumer Unit Change (Fuse Board or Fuse Box Change) Includes Live and Dead Testing
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- เผยแพร่เมื่อ 6 ก.ย. 2024
- This is one of my learners practicing his live and dead tests as part of a training aid for his classmates. The video will be used to provoke class discussions on best practice. Please remember this learner is working towards his qualification and is not currently registered as a Part P domestic installer. The installation with be tested again by his QS and notified through the correct channels.
In this video we change a consumer unit sometimes called a fuse box and carry out live and dead testing.
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
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I could watch GSH Electrical & John Ward Videos, all day long! ..find them so fulfilling and educating .....outstanding stuff ! best on youtube ! Digital Pioneers for online education ..
Wow thanks.
Great to see a step by step video in a real world environment
For a visual learner, this is amazing! I appreciate you guys so much. I've got my AM2s in 2 days time , not sure what I would do without your vids
Good luck Thomas and a massive thanks for watching and the support. Gaz 👍🏻
How'd your AM2 go?
@@romi_3lk520 i am now a qualified Electrician. Was not easy, only had to retake fault finding again but everything else first time.
Best work working in factory as daytime maintenance. With competent team. Close bond with management. And owner.
Great advice 👍🏻
Absolutely brilliant knowledge! I wish I'd been taught as well as this chap during my apprenticeship, my boss taught me fantastically but my college tutors didn't even have their 2391, they were useless
One of the best; thank you guys. I'm just completing Level Three and ready to do something similar. Concise and quick. We can always re-watch in TH-cam land so the fast presentation to fit in more useful information was appreciated.
Hi. It’s positive comments like yours that keeps me going... Sadly I get enough negative ones. Thanks for taking the time to message and support my channel Gaz
Silly question. When the CPC continuity was done on the cooker circuit, he then went to test polarity by operating the isolator. Isn't that a double pole isolator? Therefore even if the polarity was incorrect and the line was actually the neutral, there would've been a break in continuity by operating the isolator.
This is so helpful thank you! I've got my practical exams coming up in the next few weeks and this is exactly what I needed!
I am a registered Part P and soon going for my NICEIC assessment this was the most helpful video for me to refresh myself prior to assessment day and follow the steps.
Thank you
Hi. Thanks for the positive comment And all the best Gaz 👍
Nice to see it done properly. Try working for a company who wants 3 seperate EICR's per day. Safe to say I informed NIC of their antics and shortcuts after I left
Great job Marcus, the way in which you've dressed the board would put some electricians to shame. Gaz you should feel very proud.
Hi. We try hard at my college but we are not always right. Remember this video is not totally perfect but will raise talking points for his fellow classmates as we look to put into practice our training. Marcus was under pressure for 6 hours during the filming of this video and I think he gave a great account of himself. Thanks for the support Gaz
I am making a career leap into this field after 2years of study. Remarkable work guys, I have just finished y lv3..booked in to do 18th edition also. Markus looked impressive in explaining everything he was doing. Top marks to you all...great presentation. I can't even begin to recall those correct sequences/processes as he did...well done.
Nice and neat board, lovely job. Must take a fair bit of time to set up the cameras and do that sort of filming. Churning out some fine apprentices there Gary.
this video is very good.i have been watch this video several times be cos i learn to many things which is good for my test exam
many thanks to Gaz and Marcus for this video
Great videos about the testing procedure but could you try and do some fault finding videos using your multi function tester cheers keep the great videos
7 mins into video. r1 = 0.15, rn = 0.15 . if 2.5/1.5 (T & E) r2 of 0.45 is bly high? I would expect 0.25
That how I worked it out too r1 = 0.15. r2=1.67× r1
0.15 × 1.67=0.25
You're a very knowledgeable student. Well done to you.
Thomas McClennon thanks 👍
Thank you for all the hard work to make this detailed video. Cheers Gaz
Great video. Will be using this as a reference video as I’ve been stuck on new installs who had their own dedicated testers and just started with a company who’s main customer is the local councils so lots of testing, remedial work and rewires. What’s everyone’s views on the cooker DP isolator being above the cooker itself? I suppose it’s the RCD protection cop out but I would’ve moved it to somewhere more appropriate . Nonetheless GSH are my go to learning source just to refresh - keep up the great work guys 👍🏻
This is one of the best vids ive seen so far, well done lads
Hi thanks. It will be used to provoke discussions in my classroom on best practice for testing and should we carry out live Zs testing etc. All the best GSH Electrical
Thank you (both of you)
Is there a video demonstrating how to carry out an I.R test on a circuit that has an RCBO? Is it a case of disconnecting all conductors before carrying out the test in exam conditions?
Fantastic video. Lots of good information throughout. 👍
You are very good teacher greatful job
I am with the you on this , as their was never ‘this much testing in my day and having just bought some new equipment and before my 18th I’m glad it’s something to rack the brains 20 years on .
However their is a but and mine is theirs no way electricians allow the time to do all that testing when doing a board change as simply the clients do not pay for that time . So not Many are going to do all this .
Most folk go down the RCBO route and eradicate the RCD Problems.
Never the less great video and gave me some good pointers . Thank you 👍
Hi. Thanks for commenting and watching Gaz 👍
GSH Electrical 👍.
I’m thinking of making a fica type wall in my garage with a some different circuits just to get a grip on all the testing . After work go out with a cuppa and mess about with the tester and do the tests over and over again to get in the habit and getting to grips with them all .
What’s your thoughts on this for an idea just out if interest ?
Thanks
Such a great video, really helpful. Just one things regarding the r2 reading on the ring final. It should have been 0.23 (or very close to). That just got me scratching my head. Thanks!
Thanks to both of you
This guy is a model student.
Thanks 👍
When insulation resistance is performed on the lighting circuit, to change strappers you must switch one switch at the time otherwise switch will be in on or off position . Worst case when switch is left in off position ,than switched line conductor will be missed.Also there is no reason to do insulation resistance test twice between cpc and neutral as they permanently connected.
Hi. Thanks for commenting and watching
th-cam.com/video/9AjyWl_2bds/w-d-xo.html
All the best Gaz 👍
When testing ir and continuity if you were to find faults what needed to be addressed but the client wasnt happy with paying the extra money what would be the outcome. Just put the old consumer unit back up?? Or just fit the new consumer unit and state all issues on the certificate that need addressing even if they could be dangerous. maybe do a quick blanket ir before giving the client a quote? Great vid by the way.
Hi. My learner did pre tests before starting work. With the old consumer unit in place he did continuity, insulation resistance, Ze and a full visual inspection. He found a fault on the ring circuit during these tests. At this stage the old consumer unit is still in place. Pre tests are very important for the reason in your question thanks for your great question GSH Electrical
What was the reason for the change of CU ? This looks like another CU change for no real reason? Even if there was no RCDs , it was installed to an earlier edition of BS7671 that doesn’t mean it should be replaced or upgraded . HSE note published in BS7671 was and is clear on that. When he found a continuity problem he should have coded it, not fix it and use it as an excuse to replace the CU . No one takes any notice of the regs or the HSE note . Did all the test results comply with BS7671 yes they did so why change the CU he should / could have signed it off as safe for continued service.
If you do a board change do you have to bring the whole insulation to to current standard like higher sockets .
The r2 reading on the ring was high, much more than 1.67 x 0.15. It might be old 2.5 + 1 mm2 t+e cable but it would still be a bit high. I think there is a slightly loose cpc somewhere.
Hi. All good talking points hence the description in the video also can be due to the resistivity of the copper 👍thanks for the comment GSH Electrical
Why do you have to connect main earth for insulation resistance test why can't it be left out
Excellent video Thank you very much
Love the real world videos. Thanks for sharing.
Also do you have any videos of more faults you may or have come in testing across and how to deal with them. Thanks
Hi. Will try and put something together over the coming months. Thanks for the support GSH Electrical
Thanks
Another Great video, step by step and well explaned
Great video as always!
Thanks 🦾
Very very good . Well done boys
Great video just out of interest the cooker circuit zs reading seemed very high?
Brilliant video Gaz. Keep up the terrific work and productive lessons for us learners.
May I also ask you which tester would you recommend to buy for long term use. I’ve almost completed my level 2. Cheers
Links
Thanks for the support... my college use Megger testers and I have a great relationship with Lee Baker from Megger... get the best deal you can and read the instructions of the tester you select that’s Gaz
Hi I'm a big fan of your work but I have a question before you start you insulation resistance you earth your met what is a met???
Donovan Greenwood MET stands for main earthing terminal 👍
Nice job Marcus
🙌🏻
Question? Whats the difference between polarity & functionality test. The young man switched the switch and said polarity confirmed but i thought that was a functional test to see that the switch is working.
Can someone explain the difference between polarity & functionality test please
Excellent video.. well done to the chap and a good job. Can you advise I am looking to do this course. Do you have a website, and prices.. Thanks John
Hi. I work for Tresham College part of the Bedford group. Tresham college have a website and you can call them on 0845 658 8990. If you want to talk directly to me message me through my Facebook page same name GSH Electrical... All the best Gaz
Maybe I'm being stupid here, but why retest (insulation resistance) between the neutral and cpc conductor on the two way lighting circuit, both are unswitched so pressing the 2 way switches should have no bearing with regards to your insulation resistance reading between neutral and cpc.
Hi. Totally correct however during training it’s easy to repeat all 3 again this removes the rick of missing out the ones we need to test between. Thanks for the great question GSH Electrical
Very good video performed by a very diligent student. Cabling seems to enter the board through the rear knockouts how was the fire integrity preserved? Do you think that it is ok to use an intumenscent fire sealent where the cables use an existing hole that may not meet current fire barrier standards?
Hi great question. The wall the metal dis board is fixed to is non combustible brick and plaster surface. Thanks for watching GSH Electrical 👍
fantastic video
Who keeps a record of all the test results carried out for the CU installation. Are/should they held by they likes of NAPIT Elecsa or NICEIC. If they aren't - then they should be.
Hi,
thank you so much for a video.
just asking if i do IR testing, the circuit must be turned off then i can start the IR testing isn it? thank you
If you T&E is 2.5mm, r1 is 0.15, rn is 0.15, the expected value of r2 should be 0.25 and not 0.45 as its only 1.67 times thinner. 1.67x0.15 is 0.25 not 0.45 except you have extra lenght for the cpc.
Or is the cpc 1mm2 in this installation 👍🏻
Great video nice to see the real world testing, nice to see that your doing pre tests and not just a straight swap. Also in regards to reconnecting the main earth to the service cut out what was the reason for it being disconnected, did you up the size?? Also I thought that the DNO would have had to connect that in ?? Thanks keep the vids coming
Hi. He upgraded the tail and earthing conductor added a 100 switch. REC will re-seal the cutout (at a cost).
Great video thank you guys so much appreciated
Thanks for the great comment 👍🏻
@@GSHElectrical Hi I just wanted to know the tool you used for nulling the test leads and plug, what is it called and where can someone purchase one from. Thank you
Thanks for the video =)
Great video gaz.
40amp mcb for 6mm cable though? I would have that on a 32?
Hi. BS7671 states that 6mm cable can carry up to 47 Amps. Thanks for the question Gaz and watching 👍
So best working practice to use a 40amp? Don’t get me wrong for bigger showers I will use 10mm and 40amp. But I have always been told throughout my apprenticeship if you come across a 6mm on a 40amp to reduce the rating to 32.
Thanks ur videos are great.
Scott
Hi. Will always depend on the correction factors applied to the cable during its run. I commend your best practice of using 10mm cable keep up the great work Gaz
cooker is on a 32 amp breaker all ready so meets the regulations?
Hi. Another one of the talking points brought up in this video to discussed in the classroom. As the circuit(s) are protected by and RCD the earth faults will be cleared by this device so no issues you are now required to do a loop test between line and neutral and check that reading again the maximum Zs of the breaker... my class won’t need the lesson that goes with this if you keep going. Thanks as always Gaz
WHAT I FIND CONFUSING IS METAL SINKS +DRAINERS AND PLASTIC PIPES
DO I RUN AN EARTH WIRE FROM SINK TO NEAREST SOCKET OUTLET EARTH TAB ANY IDEAS PLEASE?
To the usual high standards. Your videos have been a great help. Just passed my 2392-10. Found on several occasions r1+r2 over 4 did not match the socket values as cpc was greater than 1.67 times. How do we deal with this on site?
Hi. The Quality of copper and it’s resistivity unfortunately changes. Go with the readings you calculate from r1, rn and r2 to find R1 + Rn and R1 + R2 + - 0.05 ohms. All the best GSH Electrical
Cheers
Great content, it really helped with exam preparations. I was just wondering what the name/brand that lead null clip is?
Fluke
I need to put 2 double sockets for my new cctv setup,,,I’m just wondering if it’s an easy job and could you talk me though it because I’m usually good at most diy jobs around the house 👍
Brown to brown, green/yellow to green/yellow and blue to bits...
As depressing as this sounds, I can almost garrantee very few sparks would carry out all the thorough pre testing required and thorough post testing for a cu change. Been doing it 40 years and never seen any other sparks carry out all the required testing.
Hi all of my learners have to... raising standards one learner at a time 👍. Thanks for commenting and watching GSH Electrical
Good luck with that, once they are on there own in the real world doing it in an occupied property with crap everywhere some of those tests will be swerved. I’d like to be more positive about it sorry.
Supersparks I’m sure you’re right.
If they don’t bother with IR testing before a board change.......they soon will after finishing one at 530pm and then realise they have a few earth faults to trace before the RCDs stay in 😂. Been to a few where the RCDs aren’t even connected 😡😡
Great to see the learners are getting it drummed in, which no doubt become second nature.
Great vid though GSH
Chris, I do hope so. Would have liked to see this vid using a more common scenario of a occupied house with multi dimmers,countless down lights, external power and lighting,shed,loft circuits with crap everywhere etc. Instead of cherry picking a nice empty house with pendants etc.
I need to do the online certificate training.
Am I missing something here? When he carried out an insulation test between Neutral and CPC he got an infinity reading , yet we saw him connecting the earthing conductor previously into the MET supply cut out. How did he get the infinity reading. Surely the earthing lead should have been disconnected from the supply neutral.
Or did I miss something here??
Otherwise a well done video.
Hi. Was the double switch off...? thanks for the question GSH Electrical
Yes, it was. I knew I had missed something and it occurred to me later in fact to check that point. Sorry, and thanks again. The video was very informative and well presented.
Interested about the screwdriver whats the name of that?
Hi. We use this one at college 👍😁
www.screwfix.com/p/wiha-vde-torque-screwdriver-set-11-pieces/2581K?kpid=2581K&ds_kid=92700043549444123&gclsrc=aw.ds&ds_rl=1244066&ds_rl=1241687&ds_rl=1245250&gclid=CjwKCAjwsIbpBRBNEiwAZF8-z3h9jFlERmo0Mk6GK9thJaG9kdYgyiCq4F0ORvEV0atgjkJpjj9H-hoCyqIQAvD_BwE
Im afraid 0.45 ohms is way to high for r2. It should be 0.25 ohms if r1 is 0.15 ohms.
Just thinking that myself 0.25 is 0.15x1.67
Interesting you say fuse has been pulled... did you ask the dno permission or just do it? strictly speaking its the dno's property most will say not to pull, more to cover themselves and down to h&S. however in the real world we all know people pull them or have a visit from the seal fairy! each person must make a risk assessment and decide, if its one of the really old ones do not touch as it will possibly fall apart and may contain asbestos. with newer ones make sure there is no load and for extra protection wear the electrical safety gloves and visor like when changing a meter..
What do you teach your students about this issue?
Hi. He contacted the REC (I use to work for them) for permission and will be paying for them to re-sealing the cutout. Thanks for watching GSH Electrical
Many thanks to the great video!
Hi Gaz and Marcus. A quick question please. If you're testing a circuit (eg. Lighting circuit) that has being installed by somebody else years ago, how do you work out where the furthest lighting point is? And then do you record the reading from the furthest point in the continuity test as your value for the test sheet?
You’ve answered your own question pretty much, the furthest point of the radial circuit will give you the highest R1+R2 reading (lighting, radial sockets etc) as it has the most cable in the run and therefore the highest resistance which is the value you record.
The way you find it is to test at every point of the circuit (all switch points, all PIR’s (if applicable) all lighting points I.e. ceiling rose and the highest continuity value is your end point
@@alexrowbottom58 thank you for letting me know.
On here you did 1 pfc test on the breaker but should all of them of been tested?
Hi. You could calculate Fault current by doing voltage/Ze Guide)... you can argue that doing the test on the top of the main switch is always going to be the highest fault current so why bother doing down stream on a breaker where the fault current will be less. Thanks for watching GSH Electrical
GSH Electrical cheers.
Good video but I thought zs of a 6 Mcb b was 5.82 not 5.87 (21:35 ish)
Hi. Thanks for commenting and watching... Sorry if he gave incorrect information. All the best GSH Electrical
Watch twice to listen once. Education for the masses not the working classes.
I'm surprised he did not check the correct operation of the RCD before going to do the test on live circuits. other than that love to see how its done in different counties
Why did you use 6mm for the shower circuit, it's not going to be suitable, the cable's going to overheat. Should have used 10mm.
Spend a bit more money and install the correct cable. What's the power rating of the shower? When the householder finds the shower is not heating the water enough and wants to upgrade the shower, will you come back and install the 10mm cable free of charge?
Hi. The work in the property was a consumer unit change only. Thanks for commenting and watching GSH Electrical
Existing circuit. Clue in title.....
I really don't like that torque screwdriver, I didn't even know you could get them uninsulated.
Hi. That type or torque screwdrivers in general?
That particual torque screwdriver, when working in a board, I like to check the incoming tails are tighten to the correct torque at the main switch. I understand the terminations were made with the supply isolated but I'm not a big fan of uninsulated hand tools for electricians.
Hi. Another good point. The video is a training aid for my level 3 adults there are many good talking point for me and them to cover in the classroom. Thanks for watching as always Gaz
Can anyone explain what he meant at 13:10 about l-n
Rated current of the RCBOs and main cutout fuse .
Just out of interest why don’t you just do two lead low instead of 3 lead
Meanwhile, back in reality....