LIGHTING CIRCUIT FAULTS FOR ELECTRICAL ASSESSMENTS and FAULT FINDING
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- čas přidán 26. 07. 2024
- We have often been asked about the type of lighting faults that you might be expected to find during an electrical assessment. And we have also been asked about the types of faults to expect in installations of a certain age.
Not surprisingly, they are pretty much the same faults and it should be within the capabilities of everyone to find these during an inspection and test on an actual installation or during an electrical inspection and test assessment.
In the domestic world, lighting circuit faults are common and we will show you some of these in this video from LearnElectrics.
This video is No.142 on our CZcams channel where we have videos on a wide range of electrical topics.
To see a full list of all our LearnElectrics videos, click on the link below.
/ @learnelectrics4402
You can also view all our videos by typing LearnElectrics all one word into the CZcams search bar.
Always work safely, electricity can be dangerous. If you are unsure, stop and seek advice.
This video is provided for guidance only. Every electrical situation is different, please check and ensure that you are applying this learning information to your own individual circumstances correctly and safely. If in doubt, stop and seek competent advice.
Amazing video honestly. Clear and simple to understand. Thank you for this video. It has helped me loads!
Glad it helped. thank you.
Thanks for your help very well explained best tutor thanks
Thanks for watching, appreciated.
Absolutely brilliant video typical and common faults which you will find on a daily basis when being called out to fault finding on luminare circuits. Nicely explained and very methodical method which I follow. Thanks Dave keep these great video's coming much appreciated and wanted.
Absolutely we will, lots more to come, thanks for watching. Dave.
Another great video. Always good for refresher training. Thank you as usual mate.
My pleasure, thanks for watching. Dave.
3rd year apprentice here, very helpful video, I wish this was explained to me in this way when I first started as this would have been a catalyst to my learning. Thank you.
Glad you've found the channel now. Spread the word and help others and thanks for the great feedback. Dave.
Watched it thrice for a deeper understanding... Asking questions takes you directly to problem easily...
That's the way Daniel. Thanks for the comments. Dave.
Wow! This is very informative, thanks for sharing it with us Dave. It worth it and the best tutorial on the topic for me.
You're very welcome Daniel. Lots more videos on lighting being made. Keep watching.
Thanks again for your very helpful video.
Glad it was helpful and thanks for watching.
Thank you for sharing. 👍🏼
My pleasure and thanks for the support.
Very good video, well thought out scenarios thoroughly explained by the graphics in an easy to follow manner.
Glad you liked it, appreciated. Thanks. Dave.
Fantastic video Dave as always 👍 I have come across most of these faults at some point in my career. Mostly as a result of DIY . I don’t see them at all these days. Maybe that’s a sign the DIYers are leaving the electrics alone and sticking to putting shelves up .
Thank you you reminding me with another good brain work out.👍👍❤️
Thanks Sean, great support, really appreciated. Dave.
Thanks Dave.
My pleasure my friend. Thanks for the support.
Excellent 👌
Thank you. Lots more to come.
Great video👍🏻
Glad you enjoyed it Mr Dibbo. Thanks for the support. Dave.
awesome videos Dave, they all help fill up the knowledge, how about a video or two on prep for lvl3 exams on all subjects
Its now on the list Edward. Thanks for watching and commenting, appreciated. Dave.
Thanks Dave
You're welcome David. Thanks for the support. Dave.
Awesome 👌
Looking forward to a decent pint of ale.
Hi Robert here not Angela lol, another excellent video especially the large easy to follow diagrams. One thing though am i correct in saying that on a1 way light switch the brown live wire on the switch cable terminates in the common but on a 2 way or 3 way lighting configuration that same brown wire terminates in L1 and the black strapper cable from the 3 core goes into the common and also either gets carried on through to the common on the either 2nd or 3rd switch depending on the set up. Its remembering this which is tricky i guess it comes with practise thankyou so much your videos are a godsend they really are.
Yes Robert, it comes with practice. If you put the Line into common on the 2 way circuits, it would not work as required. Thanks for watching, Dave.
It's a very interesting review.☺☺☺
Glad you think so, thank you. Dave.
Thank you Dave. I have got a question about insulation resistance test on lighting circuit. When there is so many spotlight oncircuit, some electricians do the test bu 250 rather than disconnecting all light and doing 500v test. Some connecting line and neutral and just doing test between them and earth. Is it right way?
Does it comply with regulation?
Sorry if you find it irrelevant question.
Mohammad, take a look at this video, some testing methods changed with Amendment 2 and this video will explain.
AMENDMENT 2 - 18th EDITION - INSULATION RESISTANCE TESTING - CHANGES - click on the link
czcams.com/video/Kly-q-DShxA/video.html
I have found the trapped insulation problem and loose terminals within pre wired connector blocks on outdoor lighting accessories from the well known DIY suppliers. Check all screw connections, saves getting the ladder out twice!
Spot on advice there Mike. Check connections before mounting at height. Thanks. Dave.
Thank you Dave for the detailed explanation. If possible, I can communicate with you to discuss some questions related to street lighting circuits, as I have been working in this field for a long time and I face some technical problems due to the inability to understand how to choose the appropriate method to protect these circuits and people from electrical hazards. One of the problems is, if the luminaires are LED type and feed by a 3phase (4by16mm2) cable system. Is it ok or not to use the armor of the (4by16mm2) cable as a cpc instead of a copper cpc to reduce the cost of materials?. The second question: is it a must to use an RCD in addition to the circuit breaker in these circuits?
Steel armouring has only about 12% electrical conductivity of copper. Generally, it is accepted that the armouring of a cable has an equivelant conductivity of the copper cores. So, 16mm cores, the armour is equivelant to 16mm copper. If you need a bigger size earth you will need to run a separate cable. If the regulations for street lighting say use an RCD then you should be using an RCD + MCB or RCBO. If something goes wrong and people are injured, you will have to explain why you did what you did. Thanks for watching.
@@learnelectrics4402 thanks a lot for the reply
Thanks again for the video. I may be wrong here, but at 3.09 you say "the current flows through the switch to the common terminal and up to the switch block". Your diagram shows the switching line coming from L2 to the switch block?
As long as it returns to the switch block, that is the main point. On one way lighting as long as one or the other is in common it will work. Dave.
can you make a video about testing motor in circuit
Good idea Chalak. We have videos on connecting motors so Testing is the next logical video. Thanks for the request. Dave.
Hi, dave. During a consumer unit change and when doing a live test, I found out that the earth was live. I could test 14V coming from the earth but the RCBO did not trip. What can be the cause?
RCBOs work on current not voltage. Make sure all your earth connections are as they should be, this sometimes happens on some earthing systems.
I did a lighting circuit fault find 2 weeks ago. Customer complained of a burning smell and coming after he switched on the lights and then the lights tripping.
After a few investigation we lifted up a floorboard to get acces to a joint which I couldn't get to from the light fitting, and saw a huge rat had clamped onto the switch wire. The burning smell was the rat cooking when the current was flowing through him. There were also live maggots eating him out 🤢🤢🤢🤢.
Yep, it happens more than we realise. Not a nice job but its got to be done. Dave.
My bedroom light randomly cuts out. I've had a sparky look at it and we've changed the pendant and switch, but couldn't find anything wrong and it is still happening and thoughts?
Check all the lighting circuit and the lamp. Process of elimination.
Odd one here, 3 core and earth on bathroom fan.
After fan isolator, switched live only giving 130v, perm live happily giving 230v. Any ideas? Neutral fault???
Remove the wiring from the fan (after drawing how it is wired) and check each conductor. If your earth is good, then a voltage check earth to each wire should show either zero volts or 230 volts ish. Flick the switch and see what voltages change.
I would like to understand how testing is completed after flood damage if the consumer unit is unaffected please.
We would test the same as any other testing. The priority is to get the circuits dry and replace any wiring as required. Hope this helps. Dave.
how is it going?,omg~ tota well edition, catch you later~ ))
Thanks for watching.
Can someone please fo a video regarding the blue wire. The fact that its earthed at points along points back to the power station. And that ac curent moves down the blue wite but doesnt short to earth?? Nor do the earthed parts of the installation become energized yet are connected to earth and thus to neutral and ac current flows 'back' up the wire on the negative peak of the sin wave?? Please coz its not looking safe on paper or logical to connect earth to neutral
Neutral and earth are physically bolted together back at the substation so the same electrical potential. There is (about) zero volts difference between them. But yes, maybe a video could be done.
@@learnelectrics4402 please do, no one has adressed this phenomenon. If the current changes direction ( alternating current) then at least 50 times a second the blue wire should behave excactly as the brown wire does. And thus energize all earth bonding if the flow is coming in from both live conductors . Why is the electrical pressure only registered on one wire if they 'alternate'??? Need to know. And thank you for sharing your knowledge in the community.