I needed this video. Excellent teaching method. Cheers.
@learnelectrics440210 ай бұрын
Good to know the video has done its job. Thanks. Dave.
@bizerbalpesh2 ай бұрын
Man, a great example to be on you tube...great work and explanation...
@learnelectrics44022 ай бұрын
I appreciate that, thank you. Dave.
@martmckn Жыл бұрын
Thankyou for this training video…… another addition to my mental toolbox …..your videos are really appreciated
@learnelectrics4402 Жыл бұрын
Great, thank you. Appreciated. Dave.
@berkotropia9 ай бұрын
You and your videos, man! Wicked!
@learnelectrics44029 ай бұрын
Thanks for that, appreciated.
@seanakiiki7670Ай бұрын
Surely am learning much from all ur lectures , best regards and God bless
@learnelectrics4402Ай бұрын
Glad to hear that and thanks for watching, appreciated. Dave.
@A.Y.A Жыл бұрын
Wow a great video. Exception, simple and accurate. Thank you. It's really fun and learns to see your videos.
@learnelectrics4402 Жыл бұрын
Glad you like them and thank you for watching. Appreciated, Dave.
@georgelutu719610 ай бұрын
Thank you for this video. Dankeschön!
@learnelectrics440210 ай бұрын
You are very welcome.
@adnanidf94 Жыл бұрын
Another great video. Really appreciate your hard work in making these videos. It has helped me alot.
@learnelectrics4402 Жыл бұрын
Glad to hear it and thanks for watching, appreciated.
@brilliantproltd97123 ай бұрын
Superb information
@learnelectrics44023 ай бұрын
Thank you for watching, appreciated.
@prabaharan-i4r10 ай бұрын
Thank you for this video it’s a great explanation ! I just wanted to know, why the overhead power supply can’t provide TN-C earthing arrangement ?
@learnelectrics44029 ай бұрын
Its whatever method that the supplier uses when installing a supply. We just work with what they give us.
@no_short_circuit Жыл бұрын
Thanks again for a clear explnation. For Ze you show (for all types of earthing arrangements) the three wire method for test leads, with one to L, N and E. When measuring PSSC you say that it's "exacly the same test leads and meter set up" but show the blue and black wires from the meter joined together on the N conductor. That is the correct configuration for measuring PSSC?
@learnelectrics4402 Жыл бұрын
Correct. The measurement is between Line and Neutral, so the black earth lead is is on the neutral. but the meter needs the neutral connection, so we put the blue neutral lead there too. Have another look at the video, it is explained. Thanks. Dave.
@babyprince84uk10 ай бұрын
I cannot thank you enough for these wonderful videos. I was wondering. Why Ze must be a live test? Why difference it will make if we test it without electricity? Is it because we have transformer which has windings coil that is inductive resistance?
@learnelectrics440210 ай бұрын
You cannot test Ze as a dead test without turning off everybody else electricity in the town. Its a live test back to the suppliers transformer, This video will help. kzbin.info/www/bejne/rqWnepdjnJx6oLc
@bizerbalpesh2 ай бұрын
May have a video on Industrail equipment/switch cabinet loop impedance testing.
@learnelectrics44022 ай бұрын
It is now on the list. Thanks for watching. Dave.
@marian-mihaiciobanu108911 ай бұрын
Hello! Where is the additional source electrode (PME) on the TN-C-S drawing...? Thank's for the video!
@learnelectrics440211 ай бұрын
PME uses the electrode back at the supply transformer. Take a look at this video on earthing systems. Thanks for watching. Dave. kzbin.info/www/bejne/p3LEmWOLpt1spas
@nittaberi Жыл бұрын
I believe, that Zs not only the Eart Fault Impedance. I think, that the Line-Neutral loop impedance is also called Zs. The Prospective Fault Current (PFC), and the Prospective Short Current (PSC) is also depends on system loop impedance (Zs). Do I see well? Thank you for your very useful work! 👍
@learnelectrics4402 Жыл бұрын
No, Zs is a line to earth fault. Between line and neutral it is a short circuit. Have another look at the video. Thanks for watching. Dave.
@arayated5608 Жыл бұрын
Well come mate.
@learnelectrics4402 Жыл бұрын
Glad it was useful, thanks.
@gwool4771Ай бұрын
Hi, to measure the PEFC doesn't the main earth need re-terminating to allow for parallel paths before measuring for the PEFC?
@learnelectrics4402Ай бұрын
Have another look at the video. PEFC is tested once with the earth out, to prove an earth, once with the earth in to take into account any parallel Paths. Hope this helps.
@pietnel6077 Жыл бұрын
Do we also test pscc between phases on a 3 phase system? This current can be way more than pscc between L and N. Will the CB be able to handle this short circuit current?
@learnelectrics4402 Жыл бұрын
We can m measure PSCC between L & N but most test meters will not measure between phases as they are not designed for 400V. We choose the worst case PSCC from the single phase testing and multiply by 2. We use this as the prospective 3 phase short circuit current. have a look at Appendix 14 page 554. Dave.
@jonerasmus93992 ай бұрын
At 5:25 , the Ze test . Must that curcuit be dead before testing . Im confused when you said we are doing a live test. To be clear What is ment by a live test ?
@learnelectrics44022 ай бұрын
A dead test - no electrical energy in the circuit. Completely dead and tested for dead. Live test, the circuit is energised as it would be for normal use, boiling the kettle, cooking the dinner, etc. Hope this helps. Dave.
@bonnywail Жыл бұрын
If we have a Line and neutral conductor back to the transformer then why not convert TT systems to TNC-S arrangements throughout. We need a line and neutral from Source to dwellings anyways so we already have a complete circuit from supply!! I'm guessing it's not that easy as it would have been done already..It makes me wonder sometimes tho considering how unstable TT systems can be under some circumstances..
@Hff19927 Жыл бұрын
Id assume it’s because tns and tncs are bonded to star point through MET. It doubt it would be feasible to have a single earthing terminal for a property going back to the transformer thus the need to earth it seperately.
@learnelectrics4402 Жыл бұрын
The TNS and TNCS cables are of different construction. If they are retro-fitted as overhead cables, the weight can be quite substantial. Good question.
@learnelectrics4402 Жыл бұрын
Thanks for taking part Daniel, appreciate the input. Dave.
@Roq-stone10 ай бұрын
I doubt it could be made much clearer.
@learnelectrics44029 ай бұрын
Very nice reply, thank you. Dave.
@babyprince84uk10 ай бұрын
I’m slightly confused. Why do we need to do PFC? That is the purpose. Thanks for the fantastic video!
@learnelectrics440210 ай бұрын
Its one of the essential tests and helps us ensure that the devices can handle the fault current.
@babyprince84uk10 ай бұрын
@@learnelectrics4402 thank you But I don’t understand which part of the breaker will this help with? I know we need the short circuit part. But I’m now aware of any scenario where we can practically use PFC to choose breakers or anything else