Your videos are so informative, I preach them to the apprentices I work with. I wish that you would do one covering solar panel installation or wind or hydro electric installs
Hi Dave, Thanks for another informative piece. I heard recently about a case where a neutral was left out on a DB board and the main switch was turned on causing 400v to float across all 3 phases. I understand they are connected to the neutral at the source (delta/star) but not fully understanding how you can end up with 400v going through each individual phase & consequently damaging 230v equipment. If you ever have the chance to explain this, i & hopefully many would find it very educational. 👍
Great video as always Dave! Personal gripe of mine which you never mentioned though is cable/conductor numbering. Nout worse than working in a highly populated board full of singles where the Neutrals and CPC's are mixed up and not in the correctly numbered terminals!!
Good point Andy, and many an Anglo-Saxon expletive has escaped my lips when I've opened up a spaghetti board. Hope you're keeping well. Sami is over in France at the moment. Take care matey.
Do you consider Load balancing when adding Single Phase circuits from a 3 phase board that al ready has a 3p Circuit Breaker? I have a medium printer that works on a 3 phase supply, 10 amp per phase, but i need to add a Single phase heater that consumes 15Amp, is there a way to avoid this imbalance?
you can only balance it if you have other loads that can be switched to different phases to balance things. Look at the overall balance on the whole board with a clamp meter.
Dave. I wonder why the Earth has to pass through the same point as the Line and Neutral conductors in a metal board? Considering the board is bonded to Earth I cannot think of a reason... Any idea? Thanks again! Mark.
This is to ensure a zero sum current through the hole and no eddy currents n the casing. Remember that there is also the possibility of earth fault currents! Hence the reason for all five (5) conductors of the same circuit to pass through the same port.
I still don't understand if single phase boards/consumer units supplied from a three phase board share the same main earth from the supply? Lets say i have 1 three phase board supplying 3 single phase boards,to measure Ze would only the main earthing from the distribution board need to be disconnected to measure Ze or you have to do this for the other 3 single phase boards(do they have different main earthing conductors?)
Ze is measured at the point at which the supply enters the building. You will only need to disconnect the earth at the DB where you are testing. This video will help on this link. th-cam.com/video/eIM0-uVtV0E/w-d-xo.html
@@learnelectrics4402 Fantastic video,so for measuring Zdb you still disconnect earth at each subsequent consumer unit to get the measurement,thanks. Wish I could tip a coffee right now.
Thank you Dave your videos are always very clear, informative and educational, thanks for sharing 🙏
Very welcome Anthony, thanks.
Top bloke , information is at peak
Thank you, your comments greatly appreciated. Dave.
Wow! This video is very informative and the best video tutorial on the topic for me so far. I really appreciate it. Thanks for sharing it with us.
Glad you enjoyed it, lots more on the way.
@@learnelectrics4402 welcome
The best teacher there is.
We normally only sign off our own work. We are liable for what we sign for. Same with EICRs, we sign for the inspection work we have done,
Clearly explained video, keep them coming!
Thanks, will do, keep watching, spread the word. Dave.
Brilliant informative, keep it up, it's much appreciated.
Will do Andy. thank you. Dave.
Very informative!
Glad you think so and thank you.
Well explained 👏
Thank you, much appreciated.
Thanks for the videos, appreciated very much. ❤😊
Thanks for watching. Lots more to come. Dave.
A class act again. Thank you!
My pleasure and thanks for watching. Dave.
Your videos are so informative, I preach them to the apprentices I work with. I wish that you would do one covering solar panel installation or wind or hydro electric installs
Good suggestion, its now on the list. Thanks for watching and thanks for spreading the word. Dave.
Another great video. I look forward to the next one.
Lots more to come. Thanks for the feedback. Dave.
Hi Dave, Thanks for another informative piece.
I heard recently about a case where a neutral was left out on a DB board and the main switch was turned on causing 400v to float across all 3 phases. I understand they are connected to the neutral at the source (delta/star) but not fully understanding how you can end up with 400v going through each individual phase & consequently damaging 230v equipment. If you ever have the chance to explain this, i & hopefully many would find it very educational. 👍
What an excellent idea for a video. Its now on the list. Dave.
Thanks for the videos
Glad you like them, appreciated.
Accurate and meaningful info
Thanks Albert, much appreciated comments. Dave.
Fantastic video, thank you
Glad you enjoyed it and thanks for watching.
Very Helpful
Glad it helped, lots more to come. Thanks. Dave.
Great video as always Dave!
Personal gripe of mine which you never mentioned though is cable/conductor numbering.
Nout worse than working in a highly populated board full of singles where the Neutrals and CPC's are mixed up and not in the correctly numbered terminals!!
Good point Andy, and many an Anglo-Saxon expletive has escaped my lips when I've opened up a spaghetti board.
Hope you're keeping well. Sami is over in France at the moment.
Take care matey.
@@learnelectrics4402 same!
In France eh?
Alright for some ey!?
Keeping well here, Hope you are to? :)
Bostin, as they say.
Catch you again Andy.
Excellent 👌
Thank you my friend. Dave.
Do you consider Load balancing when adding Single Phase circuits from a 3 phase board that al ready has a 3p Circuit Breaker?
I have a medium printer that works on a 3 phase supply, 10 amp per phase, but i need to add a Single phase heater that consumes 15Amp, is there a way to avoid this imbalance?
you can only balance it if you have other loads that can be switched to different phases to balance things. Look at the overall balance on the whole board with a clamp meter.
Dave. I wonder why the Earth has to pass through the same point as the Line and Neutral conductors in a metal board? Considering the board is bonded to Earth I cannot think of a reason... Any idea? Thanks again! Mark.
This is to ensure a zero sum current through the hole and no eddy currents n the casing. Remember that there is also the possibility of earth fault currents! Hence the reason for all five (5) conductors of the same circuit to pass through the same port.
Thanks Albert, there is nothing that I can add. Thanks for the input. Dave.
Pls consider a possible overload of the N!. The return current of all 3 phases will be on one neutral.
Thanks for watching.
Have a look at this video, very useful. Dave.
th-cam.com/video/zlHbsT4bhR8/w-d-xo.html
‘Linking three phases is noisy and produces a a very bright light’🤣🤣
Oh yes! Thanks for watching. Dave.
I still don't understand if single phase boards/consumer units supplied from a three phase board share the same main earth from the supply?
Lets say i have 1 three phase board supplying 3 single phase boards,to measure Ze would only the main earthing from the distribution board need to be disconnected to measure Ze or you have to do this for the other 3 single phase boards(do they have different main earthing conductors?)
Ze is measured at the point at which the supply enters the building. You will only need to disconnect the earth at the DB where you are testing.
This video will help on this link.
th-cam.com/video/eIM0-uVtV0E/w-d-xo.html
@@learnelectrics4402 Fantastic video,so for measuring Zdb you still disconnect earth at each subsequent consumer unit to get the measurement,thanks. Wish I could tip a coffee right now.
I'm here again
Where have you been. We do notice these things. Thanks for watching. Dave.
First.
Thank you, appreciated.
Great video again 👏🏼
Appreciate that, thanks for the feedback. Dave.