As many of the viewers who have commented, I am also an engineer and have been at work for over 50 years and still working. Dave is a unique individual. He can present education clearly. I enjoy his videos as a learning and refreshing program.
Subscribed. I have been in the electronics biz since 1984 and you sir are someone I could watch for hours. I was blessed enough to have my high school and college professors teach well and convey the rules and laws clearly. I would put you at the top of the heap. Thanks for making fine videos.
Perfect lesson again. I got to test circuit breakers using huge, Frankenstein-like test sets with 6" diameter knobs., analog and digital meters and timers. What a BLAST!! The three basic tests were long time, short time and instantaneous to determine how well the circuit breakers performed under actual load. The first test set was the transformer/controller that we fed with 480 single phase which dropped it down to a very low voltage C clamping large cables to each breaker phase then applied current to each until the breaker tripped. Instantaneous (depending on the test curve of each size, type, brand...) was about 10 times the breaker rating, short time was about 5 and long time was around twice the breaker rating.
This video Answers some Questions. But, it also creates lots of other Questions ???? So many Questions to ask about Electricity ?? Such as Why do some 3 Phase pieces of equipment need a Neutral and others do not ?? I have noticed that equipment with an Element do use a Neutral. this might be some of the reason for the feedback current ( Neutral wire ) Definitely a very interesting channel worth Subscribing to 👍
His example of ground fault tripping was showing a fault on the supply lines. That would indeed trip a gfci circuit breaker; but it would not trip a gfci outlet. Since most houses use gfci outlets and not gfci breakers the example shown is misleading. Otherwise a very good video with much good information. Well done.
Good example with ground fault. But I would always give two ground fault examples. One like yours where the fault goes to the ground wire. And another where the ground fault goes to the dirt/earth/water and doesn’t touch the ground wire. Then I would explain that both types will trip gfci. This gets people to think and realize that the gfci device can sense a fault where the ground wire is not involved at all. This way people can understand that gfci works correctly on a circuit that has no earth ground.
Dave, I recently discovered your videos. Outstanding job explaining and very helpful illustrations. Thank you, I hope you continue to post more content.
I came across your presentations by chance while boning up for an upcoming interview. It takes me back 30 years to when I was in tech college where we had two brilliant lecturers, Elwyn John - electronics & Mike something the electrical guy. Like you they both had the same clarity of presentation, free of waffle, not bogged down in too much math where it is not neccessary, concise & engaging. Well done!
you have a talent for explaining this stuff. It can be hard to grasp especially if someone is boring and monotone. The dynamic explanations were helpful to me. Thank you ~sub'd
Thanks for another excellent video, Dave. Years ago an old timer explained to me, basically the circuit breaker's job is to protect the wiring/equipment, the GFCI's is to protect you!
The explanation is very simple to understand and it helped a lot to clear my basics ... Can you please create more videos that focuses more on the basics like 3 phase , single phasing, earth fault vs neutral fault, earth and neutral etc ... Thanks for the video ... Great efforts
your an excellent instructor that i have ever seen , good job and keep working , you make the information to enter my head as fast as the short circuit interrupting happens 😂😂♥
I have seen many industrial panels where there is a power distribution block with many taps. Up stream it may be protected by a 150 amp breaker, but the tap conductors at the power distribution block may be a 30 amp wire that goes to a VFD or mechanical starter. Is this a problem?
Thank you so much. You certainly helped a lay person such as I who is not of the electrical profession to understand the nature of overload and faults that result in overcurrent. You mark out the differences so very clearly.
If I recall correctly with Neutral to Ground you can feel a strong tingle on the case or chassis of the device. One time I found a ceiling fan with neutral and ground swapped, you could feel it on the wall switch screws.
Thank you sir, great video. Local electricians tell us to bond neutral to ground in the first disconnect.(without it, gfci can not work?) So in my opinion, a connection between neutral and ground further along the power line, should not make a difference as it is already connected. I do understand the safety aspect of connection between life and earth(e.g. loose connection in toaster) , should trip a circuit breaker, as earth and neutral are bonded. But how does the balancing of current in a gfci works if the balance is upset due to the bonding on neutral to earth? Confused.
GFCI does not depend upon neutral and earth being bonded. So long as that earth path is separate GFCI will monitor the difference in current between line and neutral. That's all. If more than a specified current flows on the ground (30 mA or so) it will trip. Eg in a TT system you have two ground rods but no ground wire. The protection for those systems is via a GCFI.
Powerline Technician student here; I have been looking for a way to wrap my mind around the concepts. How I phrase it to myself is to "Dumb it down" to myself. This helped me so much as I am going into 3-phase and still had to figure out the basics, not just remember the formulas, etc. Thank you so much. I am going to keep watching a your content instead of Karen videos.
I saw your video, it is nice to see how it is explain, I remember long time ago when I have to master a Power system of a very Complicated Big Power Plant, Transmission and Distribution Line when there are different kind of Load for Commercial and Industrial costumer. Before we have the Westinghouse Books now we got software to solve this problem.
I would love to sit under your mentorship. Was watching your class on temperature consideration for over-current protection and it brought it all together. Thank you Dave.
my VFD running my bandsaw occasionally will shut off and display overcurrent condition. I've found that if it ramps up too fast it can trigger. If I ramp to speed slowly it seems fine. What should I be worried about? All my conductors are if anything oversized by 1 awg.
Americans, this is what it looks like when people that love to teach are teaching. Sadly in America, low pay is pushing good teachers away from teaching.
Great video. If I have a 480 volt 40 amp AH with a 480 volt disconnect and I put in a 208 volt 40 amp AH. Can I use the 480 volt disconnect with the 40 amp fuses and get the correct safe overcurrent protection on the 208 volt Air Handler?
hi sir, this video is very helpful for me... thanks for your quality video... I have one request that make a video about Auto-reclose protection with full explanation...
Over current can occur from improper sized wiring to a load. I do hvac. Say your a.c max Amp is 50 but you have wire rated for 30 Amp there will be a overcurrent. Breaker will trip.
nice work! Really good, can you do video on Relays in 480 and up HAC and inverters and how you measure them up with examples that really good add to your lectures
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You have a gift for simplifying complex information and communicating it in a humble way. Keep up the great work 👍.
well said lol. good teaching and you can tell he wants to help and has the attitude for it.
As many of the viewers who have commented, I am also an engineer and have been at work for over 50 years and still working. Dave is a unique individual. He can present education clearly. I enjoy his videos as a learning and refreshing program.
State of Michigan journeyman electrician here: thank you for helping me understand that a little more. 🙏
Sir, I appreciate the time you put into these videos.You are Definitely one of the best out here.
Subscribed. I have been in the electronics biz since 1984 and you sir are someone I could watch for hours. I was blessed enough to have my high school and college professors teach well and convey the rules and laws clearly.
I would put you at the top of the heap. Thanks for making fine videos.
You are such a great teacher. Your explanation is very clear and understandable. Thank you.
You're saving my ass in electrical school. You're the best teacher, seriously. Thank you
Love his videos! 3rd year Union apprentice here and I come running to his videos they just make so much sense!
Perfect lesson again. I got to test circuit breakers using huge, Frankenstein-like test sets with 6" diameter knobs., analog and digital meters and timers. What a BLAST!! The three basic tests were long time, short time and instantaneous to determine how well the circuit breakers performed under actual load. The first test set was the transformer/controller that we fed with 480 single phase which dropped it down to a very low voltage C clamping large cables to each breaker phase then applied current to each until the breaker tripped. Instantaneous (depending on the test curve of each size, type, brand...) was about 10 times the breaker rating, short time was about 5 and long time was around twice the breaker rating.
the way that you simplify concepts amazes me
thank you so mush
Dave your videos are some of the best! Can you do a series on motors PLEASE!!!
The importance for ppl Like you who oversimplify everything is very much needed . thank u
teaching and explaining is really your talent.
This video Answers some Questions.
But, it also creates lots of other Questions ????
So many Questions to ask about Electricity ??
Such as Why do some 3 Phase pieces of equipment need a Neutral and others do not ??
I have noticed that equipment with an Element do use a Neutral. this might be some of the reason for the feedback current ( Neutral wire )
Definitely a very interesting channel worth Subscribing to 👍
Sorry what do u mean by Element? Is it resistive loads?
His example of ground fault tripping was showing a fault on the supply lines. That would indeed trip a gfci circuit breaker; but it would not trip a gfci outlet. Since most houses use gfci outlets and not gfci breakers the example shown is misleading.
Otherwise a very good video with much good information. Well done.
This guy is such a WONDERFUL Teacher !!! Love You Dave .
wow, this is outstanding, i now dislike 'short circuit' as compared to 'ground fault' because 'ground fault' is a more accurate way to describe it
A circuit breaker can protect from overload; an earth-leakage circuit breaker (ELCB) can protect from short circuit, ground fault, and electric shock.
Great video! 👍more people need to watch this.
Good example with ground fault. But I would always give two ground fault examples. One like yours where the fault goes to the ground wire. And another where the ground fault goes to the dirt/earth/water and doesn’t touch the ground wire. Then I would explain that both types will trip gfci. This gets people to think and realize that the gfci device can sense a fault where the ground wire is not involved at all. This way people can understand that gfci works correctly on a circuit that has no earth ground.
Fantastic video, great explanations and very well presented. Really appreciate it.
Thankyou, you’ve really simplified what I needed to and understand for my final exam :)
Louise
Dave, I recently discovered your videos. Outstanding job explaining and very helpful illustrations. Thank you, I hope you continue to post more content.
Jeez Louise, thank you SO much for this video
short circuit is often called short cut hence the word: short but nice explaination
Thank you for this video! I wish I had this from back when I was studying these concepts in Uni. Well done sir! 👏🏽
I loved the way you distinguished between overload and short-circuit
Thank you. This was a very good explanation.
Thank you Steven Gerrard
Broe😂😂😂😂😂😂
nice video gretings from Guatemala hugs for you thanks for share
The clarity in this man's explanation is second to none
i hope i have teacher like you when i am young..
I came across your presentations by chance while boning up for an upcoming interview. It takes me back 30 years to when I was in tech college where we had two brilliant lecturers, Elwyn John - electronics & Mike something the electrical guy. Like you they both had the same clarity of presentation, free of waffle, not bogged down in too much math where it is not neccessary, concise & engaging. Well done!
Thank you for sharing your knowledge, sir.
your videos very helpful .outstanding explaining..thank you
you have a talent for explaining this stuff. It can be hard to grasp especially if someone is boring and monotone. The dynamic explanations were helpful to me. Thank you ~sub'd
Way better than what I'm currently paying for....
Thanks for another excellent video, Dave. Years ago an old timer explained to me, basically the circuit breaker's job is to protect the wiring/equipment, the GFCI's is to protect you!
this man is GREAT
Fantastic video, thanks for making this!
Thank you sir for teaching me electrical principles I find them to be so helpful down here in Malindi Kenya.i will crave for more,thank you sir.
Very well explained. Keep up the good work!
The explanation is very simple to understand and it helped a lot to clear my basics ... Can you please create more videos that focuses more on the basics like 3 phase , single phasing, earth fault vs neutral fault, earth and neutral etc ... Thanks for the video ... Great efforts
your an excellent instructor that i have ever seen , good job and keep working , you make the information to enter my head as fast as the short circuit interrupting happens 😂😂♥
Great way of teaching
Great teaching , thanks for sharing.
Please explain superconduct, quicken, spread, aggravate, electro-charged and hyperbloom too.
Great explanation
Perfect explanation... i Iove it
I have seen many industrial panels where there is a power distribution block with many taps. Up stream it may be protected by a 150 amp breaker, but the tap conductors at the power distribution block may be a 30 amp wire that goes to a VFD or mechanical starter. Is this a problem?
How mutch i can rich money, if i am electrician graduation,and would to work in England tomorrow ?
Thank you so much. You certainly helped a lay person such as I who is not of the electrical profession to understand the nature of overload and faults that result in overcurrent. You mark out the differences so very clearly.
If I recall correctly with Neutral to Ground you can feel a strong tingle on the case or chassis of the device. One time I found a ceiling fan with neutral and ground swapped, you could feel it on the wall switch screws.
Thank you. I needed that refresher. I plan on going back to school for electronics. I haven't practiced electronics in over 20 years.
Great teacher and a great level of understanding , thank you for these
Well made video, i think this simplify things to total amateurs and even some professionals
Subscribed, thanks a lot
Good informative. Thank you sir.
Thank you sir, great video. Local electricians tell us to bond neutral to ground in the first disconnect.(without it, gfci can not work?) So in my opinion, a connection between neutral and ground further along the power line, should not make a difference as it is already connected. I do understand the safety aspect of connection between life and earth(e.g. loose connection in toaster) , should trip a circuit breaker, as earth and neutral are bonded. But how does the balancing of current in a gfci works if the balance is upset due to the bonding on neutral to earth? Confused.
GFCI does not depend upon neutral and earth being bonded. So long as that earth path is separate GFCI will monitor the difference in current between line and neutral. That's all. If more than a specified current flows on the ground (30 mA or so) it will trip. Eg in a TT system you have two ground rods but no ground wire. The protection for those systems is via a GCFI.
Excellent video …please share more knowledge to us
I just came by your video, and I'ld say you did a good job in explaining the concepts. I hope to see more of your videos.
Thank you 😊
நன்றி
Really amazing stuff!
Powerline Technician student here; I have been looking for a way to wrap my mind around the concepts. How I phrase it to myself is to "Dumb it down" to myself. This helped me so much as I am going into 3-phase and still had to figure out the basics, not just remember the formulas, etc. Thank you so much. I am going to keep watching a your content instead of Karen videos.
Sir Short or Ground Fault results in ARCING or No?
It can be called as Arc Flash or No?
(NFPA 70E)
One of the best explanations of the types of OC I've ever seen. Bravo.
thanks for the great explanation :)
was always confused about these terms.
Very good. Thanks 🙏
Thanks for your sharing
Very helpfull explanation. Is it possible to see a video of the relation between an LSIG breaker and the types of overcurrent? Thanks for the video!
Great video.
Great refresher video. Getting ready to train a new employee. Sometimes putting to words what you already know is tough. This was a great explanation.
I saw your video, it is nice to see how it is explain, I remember long time ago when I have to master a Power system of a very
Complicated Big Power Plant, Transmission and Distribution Line when there are different kind of Load for Commercial and
Industrial costumer. Before we have the Westinghouse Books now we got software to solve this problem.
Could you please explain negative phase sequence fault.
Thank you sir for the clear details and information God bless you
Thank for illustration and very comprehensive discussion
Very nice, enlightening 💡, no short circuit ! 👌
I would love to sit under your mentorship. Was watching your class on temperature consideration for over-current protection and it brought it all together. Thank you Dave.
Thanks so much. well explained
Good instructer.
good presentation 👍
Excellent explanation.
Thank u, way easier to understand it this way
Can’t say thank you enough!
my VFD running my bandsaw occasionally will shut off and display overcurrent condition. I've found that if it ramps up too fast it can trigger. If I ramp to speed slowly it seems fine. What should I be worried about? All my conductors are if anything oversized by 1 awg.
Very well explained
Americans, this is what it looks like when people that love to teach are teaching. Sadly in America, low pay is pushing good teachers away from teaching.
great explanation
Yes iwant to learn your channel good
very nicely explained
Great job explaining! you hit important points without talking about unrelated things or rambling. Also very engaging energy!
I just discover your channel. Excellent presentation and explanation. Please make more
Great video. If I have a 480 volt 40 amp AH with a 480 volt disconnect and I put in a 208 volt 40 amp AH. Can I use the 480 volt disconnect with the 40 amp fuses and get the correct safe overcurrent protection on the 208 volt Air Handler?
hi sir, this video is very helpful for me... thanks for your quality video... I have one request that make a video about Auto-reclose protection with full explanation...
Over current can occur from improper sized wiring to a load. I do hvac. Say your a.c max Amp is 50 but you have wire rated for 30 Amp there will be a overcurrent. Breaker will trip.
What is dead short? Is it Short to ground or between phases or is it used universally for both?
If only my teacher's could teach like this it would have been awesome 👍..
I appreciate your succinct explanation. It will assist me in finding an electrical defect in my driver's side indicator light circuit. Thank You.
nice work! Really good, can you do video on Relays in 480 and up HAC and inverters and how you measure them up with examples that really good add to your lectures
well explained