PFC TESTING - PROSPECTIVE FAULT CURRENT- DIFFERENCES BETWEEN SINGLE PHASE AND THREE PHASE METHODS
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- Опубліковано 12 лип 2024
- In this LearnElectrics video we will look at the differences between the single phase and three phase testing of prospective fault current.
We are frequently asked questions about the differences and have included things like …
What is PFC?
Is PEFC the same as PFC?
Just what is PSCC?
And how can I find 3 phase PFC with my meter
So in this video will put some of those questions under the spotlight and look at things like …
Why do we want to test it anyway?
If there are differences, then what is the reason
Why have so many initials
And. Once we have some numbers … which ones do we use.
To view all of our videos type in LearnElectrics all one word into the UA-cam search bar.
This is video No.173 on our UA-cam channel where we have videos on a wide range of electrical topics.
Thanks again for taking the time to give us a comprehensive and easy to understand explanation.
My pleasure, it had to be done. Thanks for the feedback. Dave.
I'm 32 and studying to be a electrician, these are so useful thank you for your time and effort.
Brilliant choice of career. Many 30/40 year old folk change career and make a really good living out of electrics. keep learning and be patient. Good luck. Dave.
And that.. is how to explain PFC testing.. I'm surprised you don't produce a booklet-guide. I would definitely buy copies, but on the other hand I am glad its free.. ! Excellent video Dave. Many thanks. 👏
Maybe one day. Thanks for the great compliment, appreciated, Dave.
Thank you ….. great explanation ….. more for my “mental toolbox” … 😊
That's it Martin. The mental toolbox. Thanks for the support, thanks for watching. Dave.
Thank you, Dave I really appreciate the time you're putting into sharing your knowledge, keep up the good work.
Thanks, will do Anthony and thanks for watching. Dave.
Best channel ever. Thank you very much
Thank you so much Luca. I really appreciate your support. Dave.
just want to add my thanks for producing this and your other videos. By contrast to many other videos out there, yours are simple to follow and very clear, perfect for an individual like me (highly qualified and experienced in other fields) who is trying to retrain and battling against the need to get experience in the industry, but who needs qualifications too (that often don't teach much of the practical stuff needed in the workplace). Some videos seem to be an excuse for the maker to show off their knowledge and are really hard to follow / watch - yours are the opposite - a breath of fresh area and bite-sized enough to understand in one sitting. Thank you very much.
Thanks for the great feedback. Yes, the idea was to keep things simple and just one topic at once. 15 to 20 minutes is about enough to take in at each viewing. Thanks for the support. Dave.
Thanks again, another great video. 👍
Thank you. Appreciated comments, and thanks for watching.
Another great video
Super feedback Mr D. Thanks for the channel support, appreciated. Dave.
Yes Superb fair play.. 😊🤛🎸
Thank you Mark.
Hey my friend, would love to see a video on hot tubs wired to a Tncs system and what to do, the internet is a giant can of worms when it comes to this topic
Thanks for watching Josh, appreciated. Your question is now on the list to be done. Dave.
Hi Dave BIG THANK YOU.
Thanks for the comments. appreciated, Dave.
Great content, I always seem to learn something new about each subject that I hadn’t previously known and I’ve been an electrician for 35 years. Just goes to show, you never stop learning. Thanks for the info.
Absolutely right. I'm no different. Every day is a school day. Thanks for watching. Dave.
Excellent
Thank you Clyde. Thanks for watching. Dave.
Another very good lesson.
Thank you, appreciated, Dave.
Excellent 👍
Thanks Brian, great support, appreciated. Dave.
Many thanks.
You are very welcome. Lots more to come. Dave.
Awesome… good information and data
Glad you think so and thanks for watching. Much appreciated.
@@learnelectrics4402 youre doing ‘rare’ videos. This video suitable for teaching and learning class. 👍👍
Hello
I am a follower of your lessons and a big fan of them. I hope that you will show videos explaining the method of calculating the power factor, as well as the correct way to calculate the main breaker, and whether it should be larger than the service provider’s breaker, equal to it, or less in size than it.
sincerely
Khalid
Thank you Khalid, appreciate the support. I've put your request on the list. Thanks for watching. Dave.
Good video,
Thanks Anthony, appreciated the comments. Dave.
Thankyou so much, been sat on my arse too long....
Time to get the old grey matter stirred up again. Good luck and thanks for watching. Dave.
Hi Guys, great video yet again. What is your procedure for these tests at the end of a sub-main that feeds a distribution board? Thanks
On the generic schedule of test results (page 531 in Regs book) it calls Ze as Zdb. There is only one real Ze and that is at the actual source of supply to the building. At a sub board this was measured as a Zs but now we need it to be a Ze for the Zs readings that come off the sub-board.
Use Zdb and just remember what you are referencing it to,
Hi Dave, another great video, one question, what protections we can make with current leaking device like VFDs and electronic equipment which discharge current in earth witout using rcds.
If you mean equipment with "natural" high leakage currents there is a special section for this. Thanks for the question, its now on the list to have a video made. Thanks for watching. Dave.
How to you locate the main earthing conductor? What if there isn't a clear way to see it at consumer unit?
Just practice Haider. If its there you need to find it, and no, there is no magic rule to find it. Some installations are really bad. Dave.
@@learnelectrics4402 okay thanks for the response, your videos are a gem.
Hello Dave, many thanks for the great videos, what is the test instrument used to do this test ?i have GSC60 from HT Instruments, it perform loop test, is this test enough?? Or ist the same ? I'm a little bit confused
For pfc testing you will need a meter that will do prospective fault current in amps. If you have a multi-function tester they will have this function on there along with a loop test setting that will measure in ohms. Put your meter number into google and pull up a user manual for it. Hope this helps.
@learnelectrics4402 thank you for answering my question 🙏🙏🙏
Good video again Dave. I take if for some reason you have already carried out your Ze then you have already proved continuity of the main earth and therefore the pfc tests would not require a test with the main earth removed? I’m lucky in that my mft gets all these results at once.
Thanks for watching. Yes, this is just one of the tests. Dave.
shear class !
Thank you. Great comments, appreciated. Dave.
Hi
can we do this test from any Socket or should only from the Distributor.
Thanks
The PFC test, the ZE test is at the main switch in the CU.
However, it is the same test meter switch positions to do a ZS test at the sockets and other points of use.
Ze will always be the lowest resistance and therefore the highest PFC, which is what we want to write on the certs.
Take a look at this video on the differences between Ze and Zs, it will help. Thanks for watching. Dave.
ua-cam.com/video/eHT_m2mRs7o/v-deo.html
At 13:48, why do we need to choose the lowest Ze? 😮Shouldn’t we choose the highest as the worst scenario? Can someone explain this please! We just had practical of 2391-52 and we had to choose the highest Ze!
Two scenarios, different answers. This actual video is about PFC, the current. for a given voltage, the worst case current, the highest current is with the lowest Ze. So that sorts out the highest PFC.
If we now want to know if the lowest PFC (current) will trip the breaker, we have to use the highest ZE as this will give the lowest current.
Using Ohms Law, the lowest Ze gives us the highest PFC (is this less than 6000A for example)
The biggest Ze tells us the lowest PFC (will this triop the breaker in 0.4 secs?)
Hope this helps
Thanks a lot, Dave! Now it all makes sense!👍Obviously, to the schedule of test results, we record the highest Ze and the highest Ipf…but we need the lowest Ze for explaining the breaking capacity and the highest Ze for the disconnection time. Best tutorial ever!
Does it means that pfc=230/Ze?
PFC can be determined this way, yes. thanks for watching. Dave.
@@learnelectrics4402 thanks for your videos they are really helpful. Why is that at times the calculated figure and measured figures are so different? A Ze of 0.11 - 0.22 should give a pfc of between 2090 - 1045, however, when using the meter I quite often gets between 850 - 1300.
Excellent
Thank you so much. Thanks for watching. Dave.