I've been studying quite a bit of the NEC in class lately, and tap rules have been my biggest struggle so far. This video made it all click immediately. Thank you Dave!
Brilliant. This really explains something that I had zero understanding of. I wish you went on tour to preach continuing education classes. I'd sign up for everything you had.
Dave, thank you! Very informative! I would love to see the concept of this video expanded into city-grids, i.e. in my home town, 400V/300A feeds from the Minor Distribution substations into the neighborhood grid, from which our houses are connected. I never really understoood the full protection scheme in this, with the minor distribution transformers split over multiple 10kV feeders from the Distribution substations.
Always excellent info! I utilize the tap rules whenever I can. Often, it simplifies the wiring. However, it always amazes me how many electricians really don't use them (even when they can), perhaps because they don't fully understand the concepts. Thanks for sharing!
Can you give a couple examples when you'd use a tap? I believe I understand the logic here, but I need to see practical application of it in order for it to sink in and be retained.
You’re not alone. I’m a senior printer that has a basic understanding of electrical, HVAC, PLC’s, etc. Seeing if I can improve my skills and make more $.
For the very first time I’m actually interested in learning about Electricity - A big thank you Dave. Truly appreciate your time and effort making these videos.
I have a ? I have a 400 amp main 3 phase delta 120\208\240 ,,, using the same Raceway conduits to feed 200 amp single phase sub panel, with attaching ! (3 phase disconnect fused at 50 amps feed thru breaker /to (Daisy chain) through new race way conduit to feed another single phase 200 amp panel breaker box, with a 3 phase 12 space panel for 208 /240 circuits ? may I run the neutral from single phase panel over to use it in the 3 phase high delta high leg 208
240.4(D), or the "Small conductor rule" does not dictate the ampacity of a conductor nor does it apply to feeder taps. If you are using the 75 degree column, the ampacity of the #10 should be 35 amps and the #14 should be 20 amps.
I’m needing to upgrade a 100A sub panel to a 200A. It’s a 200A service, would this rule be applicable to use if i tap from the main panel into a 200A disconnect?
I have a tricky multiple choice question, hopefully someone can with more knowledge can help me out A White/grey wire in a feeder circuit ________: A)Be bonded or have a circuit breaker B)Is the largest wire in that circuit C)Should not have a voltage to ground My notes: On the main panel, neutral is connected to the bar that is BONDED with the panel, the green grounding wire is also connected to the same bar. (so does that mean the answer is A?) In the sub panel, the neutral wire is connected to the neutral bar which is ISOLATED from the metal box with plastic between them, the Green grounding wire is separated and is connected to its own bar that is bonded to the sub panel box. In the circuit that this question applies to, --------- “The neutral wire is going to be sized larger than the Green grounding wire” (But that doesn’t mean it’s the LARGEST in the circuit right? Because the two hot wire could be the same size) --------"The neutral should have no potential difference(voltage) to the ground" (does that mean the answer is C?)
The answer is C. A grounded conductor (usually the neutral) should not have any voltage to ground, and is marked white or gray. The neutral might be the same size as the grounding conductor (when it carries negligible amps), or it might be the same size as the ungrounded wires (which is common). It might also be larger than the phase conductors, in applications with harmonic-intensive loads. But we don't have enough information to determine which one of these it is, so you can't conclude that it is the largest wire in the circuit. It ultimately is connected to ground at the service panel, but that's out of the picture of the location in question.
Taps of unlimited length are outside, and are not going to burn down any buildings in the event of an overload. That's why they don't have any length constraints, unlike the 10 ft and 25 ft tap rules.
Dave, I have a drawing of a three Phase Wye 208/120 secondary circuit...I need help, do you have an email address that I could send it to you. I enjoy your RUclips classes, However I have no experience with three Phase. Your Three Phase classes has not addressed my problem.
Dave, I'm still having trouble with this. For example, Solar installation's are tapping the feeders between the meter & the main breaker. Applying the 10 ft. rule what is protecting the wires that are connected to the feeders ? Even though they are in a conduit which is attached to the solar disconnect, they are non-fused.
I also teach electrician CE classes, and I have to tell you that you nailed this video. This video (Feeder Taps) would also tie-in nicely to 2020 NEC Article 705.11(C1).
So, are we talking about sub-panels here? If you drop a 6/3 90-c NM cable 35-feet away and the sub panel provides overload protection to the branch circuit, is the 50-amp breaker in your diagram the feeder breaker? In this case, it seems you need to provide great care in calculating loads .
Wow this is what I’m here for!! A thorough and clear description that even a dunce like me can understand. You’re a life saver I wish my teachers could have explained it like this!! But glad I found your channel CHEERS!!
I'm a big fan of Dave's. Comment please, say anything so this channel can grow and like all the videos you watch. These videos are so out of this world great!!!
Thanks for your request Maria. I intend to make some videos starting at the beginning of electrical theory with "What is Electricity?" and on to DC Series, Parallel, and Combination fairly soon - hopefully within the next couple months.
This is the best explanation of feeder taps anywhere on the internet. Thank you so much for this video.
Dave make these concepts look like a 2+2,man. Im studying for my 02 and this guy is making it easier for me.
What a wonderful explanation!
I've been studying quite a bit of the NEC in class lately, and tap rules have been my biggest struggle so far. This video made it all click immediately. Thank you Dave!
Too the words right out my mouth, bro.
Dave you are a very gifted teacher. Thank you for this information
I really appreciate your ability to explain in a way that is easy to follow along with. Great instructor. Thank you
I pay $1200 a year for tuition as part of my apprenticeship program and your videos are light-years better than anything my program provides
Another difficult and confusing nec section made easy by Dave .. thanks alot!!!
You do a very good job explaining and teaching these codes. Thank you.
Thanks for your videos.. please do more, you are a great teacher..
Now this is a great video. Thank you for breaking it down so well.
thanks man, 3rd yr apprentice here..... i appreciate the videos
Your videos have been so critical to my classes
Brilliant. This really explains something that I had zero understanding of. I wish you went on tour to preach continuing education classes. I'd sign up for everything you had.
Thank you for your explanation on 10 and 25 feed rules
Dave, thank you! Very informative! I would love to see the concept of this video expanded into city-grids, i.e. in my home town, 400V/300A feeds from the Minor Distribution substations into the neighborhood grid, from which our houses are connected. I never really understoood the full protection scheme in this, with the minor distribution transformers split over multiple 10kV feeders from the Distribution substations.
Utility has its own code not governed by the NEC. not to mention those are free air conductors capable of withstanding much more amps
Thanks Dave, great theory and explanation. Easy to understand the 240.
Always excellent info!
I utilize the tap rules whenever I can. Often, it simplifies the wiring.
However, it always amazes me how many electricians really don't use them (even when they can), perhaps because they don't fully understand the concepts.
Thanks for sharing!
Can you give a couple examples when you'd use a tap? I believe I understand the logic here, but I need to see practical application of it in order for it to sink in and be retained.
Superb excellent explaining teaching
Thanks very much for all this great work and explanation!!
This video helped a ton. Thanks for the content keep doing what you’re doing I know I highly appreciate it. Thank you
This was very well done. I had to brush up on this as I ran into it on a project. Your video was a great addition to the code book.
Am I the only one who watches these videos hoping it will make me a better mechanic?
You’re not alone. I’m a senior printer that has a basic understanding of electrical, HVAC, PLC’s, etc.
Seeing if I can improve my skills and make more $.
U r not a lone. I am a big fan of Dave.
Mechanical PE here and I’m trying to be more informed 😊
Thank you so much!
This is a very helpful video, much appreciated
Excelente 🎉
Great explanations, thanks
For the very first time I’m actually interested in learning about Electricity - A big thank you Dave. Truly appreciate your time and effort making these videos.
Look up the IBEW in your area. Great opportunity
Hello please can I ask something
What about equipment ground is it needed if the 300 cb was the first means of disconnect
Great tap lesson sir!
Thank you Dave for doing an amazing explanation on feeder taps!
I have a ? I have a 400 amp main 3 phase delta 120\208\240 ,,, using the same Raceway conduits to feed 200 amp single phase sub panel, with attaching ! (3 phase disconnect fused at 50 amps feed thru breaker /to (Daisy chain) through new race way conduit to feed another single phase 200 amp panel breaker box, with a 3 phase 12 space panel for 208 /240 circuits ? may I run the neutral from single phase panel over to use it in the 3 phase high delta high leg 208
240.4(D), or the "Small conductor rule" does not dictate the ampacity of a conductor nor does it apply to feeder taps. If you are using the 75 degree column, the ampacity of the #10 should be 35 amps and the #14 should be 20 amps.
Great video Dave, I have question, how did you come up with 300 amp breaker, was it based on largest load? Thank you in advance.
You're the best
Great explanation. One question. If the overload protection comes after the tap does is always need to be a fuse? I would think not...
Dave is 10x better than holtz, and he’s not charging
is there a tap on motor circuit example
I’m needing to upgrade a 100A sub panel to a 200A. It’s a 200A service, would this rule be applicable to use if i tap from the main panel into a 200A disconnect?
I have a tricky multiple choice question, hopefully someone can with more knowledge can help me out
A White/grey wire in a feeder circuit ________:
A)Be bonded or have a circuit breaker
B)Is the largest wire in that circuit
C)Should not have a voltage to ground
My notes:
On the main panel, neutral is connected to the bar that is BONDED with the panel, the green grounding wire is also connected to the same bar. (so does that mean the answer is A?)
In the sub panel, the neutral wire is connected to the neutral bar which is ISOLATED from the metal box with plastic between them, the Green grounding wire is separated and is connected to its own bar that is bonded to the sub panel box.
In the circuit that this question applies to,
--------- “The neutral wire is going to be sized larger than the Green grounding wire”
(But that doesn’t mean it’s the LARGEST in the circuit right? Because the two hot wire could be the same size)
--------"The neutral should have no potential difference(voltage) to the ground" (does that mean the answer is C?)
The answer is C. A grounded conductor (usually the neutral) should not have any voltage to ground, and is marked white or gray.
The neutral might be the same size as the grounding conductor (when it carries negligible amps), or it might be the same size as the ungrounded wires (which is common). It might also be larger than the phase conductors, in applications with harmonic-intensive loads. But we don't have enough information to determine which one of these it is, so you can't conclude that it is the largest wire in the circuit.
It ultimately is connected to ground at the service panel, but that's out of the picture of the location in question.
you r the best
What about taps of unlimited length? Code is hard to understand
Taps of unlimited length are outside, and are not going to burn down any buildings in the event of an overload. That's why they don't have any length constraints, unlike the 10 ft and 25 ft tap rules.
Dave, I have a drawing of a three Phase Wye 208/120 secondary circuit...I need help, do you have an email address that I could send it to you. I enjoy your RUclips classes, However I have no experience with three Phase. Your Three Phase classes has not addressed my problem.
Solid gold
Dave, I'm still having trouble with this. For example, Solar installation's are tapping the feeders between the meter & the main breaker. Applying the 10 ft. rule what is protecting the wires that are connected to the feeders ? Even though they are in a conduit which is attached to the solar disconnect, they are non-fused.
Very well explained Dave and the solution for the 15A protection by upsizing the cable to meet the minimum requirement of the code.
i was so clueless on picturing what was going on here as i was studying, this made it so clear thank you!
is the 100amp overcurrent because of the 1/3 rule? 100 is 1/3 of 300
Great instruction..thanks
Amazing.
THANK YOU
thank you
I also teach electrician CE classes, and I have to tell you that you nailed this video. This video (Feeder Taps) would also tie-in nicely to 2020 NEC Article 705.11(C1).
So, are we talking about sub-panels here? If you drop a 6/3 90-c NM cable 35-feet away and the sub panel provides overload protection to the branch circuit, is the 50-amp breaker in your diagram the feeder breaker? In this case, it seems you need to provide great care in calculating loads .
Wow this is what I’m here for!! A thorough and clear description that even a dunce like me can understand. You’re a life saver I wish my teachers could have explained it like this!! But glad I found your channel CHEERS!!
After several videos finally! Excellent explanation1. Following.
Thank you so much your videos have made it possible to learn and get ready for the test 💯💪🏻💪🏻
Excellent explanation of tap conductor rules. You are a gifted teacher. Thank you for sharing your knowledge.
I'm a big fan of Dave's. Comment please, say anything so this channel can grow and like all the videos you watch. These videos are so out of this world great!!!
Your a amazing teacher. Thank you!
Thank you Dave awesome video you make it very clear and easy to understand !!
Just stumbled across your channel again.. You're a great teacher. Clear. Now that I have my license this is going to be a real resource
Hello Sir can I ask something please
Amazing video!
These lessons are so fun.
Excelent
Dave can you do a video on combination DC circuits? The more I study them the more confused I am.
Thanks for your request Maria. I intend to make some videos starting at the beginning of electrical theory with "What is Electricity?" and on to DC Series, Parallel, and Combination fairly soon - hopefully within the next couple months.
@@davegordon6819 sounds great! Looking forward to it!