310.15(E) Neutral Conductor

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  • Опубліковано 12 гру 2024

КОМЕНТАРІ • 91

  • @joeljahnke9000
    @joeljahnke9000 2 роки тому +32

    Dave, you are an exceptional teacher. I appreciate, so much, your organized and sequential manner in which you teach. You rock!

  • @Calico5string1962
    @Calico5string1962 Рік тому +13

    Your video presentations are simply the BEST I have ever watched. So we'll explained and presented.
    As an industrial/commercial electrician for over 40 years, I really enjoy watching your stuff! It's always a great refresher for me.
    Thank you, Dave, for sharing your knowledge and insight!

  • @JesseKlaus
    @JesseKlaus Рік тому +8

    This is probably the most thorough explanation of shared neutrals I've seen - well done.

  • @danielelise7348
    @danielelise7348 Рік тому +5

    This guy actually makes learning this complex stuff enjoyable.🤔⚡

  • @michaeldonnelly2977
    @michaeldonnelly2977 Рік тому +4

    THANK YOU! I was looking for an explanation of exactly HOW current can possibly flow back to the source through the second hot leg on a multi wire circuit, from an electrical theory point of view. You explained it very simply and eloquently with your “trading post“ analogy. Thank you, sir! This was very, very helpful!

  • @stephendavis6408
    @stephendavis6408 2 роки тому +6

    Clear and concise explainations of both the theory and the NEC. Thank you.

  • @soundman2604
    @soundman2604 Рік тому +1

    Best teacher ever, and above all correct!

  • @abelardocamacho5289
    @abelardocamacho5289 12 днів тому

    Dave i really injoy the way you break it down, it really makes sense, thanks bro!

  • @martf1061
    @martf1061 Рік тому +2

    16:35
    Thank you. Now i understand why, sometimes, the engineers asked for a double wired neutral in transformers.
    I learned more in 2h watching your explainations, than i did in 20 years .
    I suggest you do some videos about motors.

  • @Lazdinger
    @Lazdinger Рік тому +1

    Soli Deo Gloria for this man’s videos.

  • @pamdemonia
    @pamdemonia 2 роки тому +5

    That was great! Wish you had been my code teacher when I was an apprentice!

  • @The0abc123
    @The0abc123 19 днів тому

    DAVE your a BEAST! Thanks for these videos!🙏

  • @charlieperez6844
    @charlieperez6844 Рік тому +2

    Im so glad i subscribed to your channel. Your videos have helped me understand a bit more. Thank you!

  • @doctorgoodwrench
    @doctorgoodwrench 2 роки тому +5

    Thanks for continuing to post, Dave. Your explanations are remarkable.

    • @davegordon6819
      @davegordon6819  2 роки тому +1

      Thanks for your vote of confidence, and thanks for engaging with the other viewer. I put a link to my new "open neutral" video in the responses below if you're interested.

  • @GeorgePoghosyan-z3j
    @GeorgePoghosyan-z3j Рік тому +1

    Thank you very much.

  • @benfurnish9948
    @benfurnish9948 2 роки тому +1

    Fantastic video. It makes total sense now. Plus a bonus for having the Soli Deo Gloria posted.

    • @davegordon6819
      @davegordon6819  2 роки тому +2

      Thanks brother. I am thankful for God's mercy to me and may He help us both to use what He has given us for His glory.

  • @khanhho8471
    @khanhho8471 6 місяців тому

    Thank you Dave.
    You make it very easy to understand.

  • @ryanjourneymanwireman4937
    @ryanjourneymanwireman4937 2 роки тому +1

    One of the best electrical videos I've seen (hoping info is correct) but thanks

  • @bahbee5659
    @bahbee5659 2 роки тому +4

    “Oop, keep my thumb down.” A great educator & can bring a smile to my face👍

  • @johnnyelectric7572
    @johnnyelectric7572 2 роки тому +1

    again....just a great Teacher. Thanks!

  • @mph5986
    @mph5986 2 роки тому +2

    Clearly and easy understand. 👍

  • @DanielRamos-bq8py
    @DanielRamos-bq8py 6 місяців тому

    excellent job sir ! well explained and much appreciated !

  • @michaelcostello6991
    @michaelcostello6991 2 роки тому

    Excellent lecture. So well explained. Cannot think of any questions after this

  • @TheCompton1963
    @TheCompton1963 Рік тому

    Dave is the best! 🧑🏻‍🏫

  • @paulmullen573
    @paulmullen573 2 роки тому +5

    Great videos, Dave. A suggestion... a set of videos on Grounding and Bonding would be super helpful. I understand the concepts, but I don't understand how the grounding and bonding topics are organized in the NEC and I spend a lot of time flipping pages to be sure.

  • @Errkanow
    @Errkanow 29 днів тому

    Great explanation! Thank you

  • @renediaz5162
    @renediaz5162 Рік тому

    Thanks for the awesome and useful class!

  • @vilmaceballosrozon1414
    @vilmaceballosrozon1414 Місяць тому

    Very well explained!!

  • @MrKandela10
    @MrKandela10 2 роки тому

    the best explanation!

  • @michaelarriaga08
    @michaelarriaga08 Рік тому

    Excellent video thank you so much

  • @abigalanderson7494
    @abigalanderson7494 Рік тому

    I like how Dave puts the code section next to his pictures

  • @mcarroll598
    @mcarroll598 Рік тому

    Excellent explanation!

  • @JAMESSSUNA
    @JAMESSSUNA 5 місяців тому

    Thanks...I really enjoying

  • @tfun101
    @tfun101 Рік тому +1

    At 6:40 I was like….”ohhhhh duh” and it all finally made sense. 🙃

  • @ramonqo1
    @ramonqo1 2 роки тому

    You are the best.

  • @xevierred6330
    @xevierred6330 Рік тому

    Fascinating

  • @safetythirdified
    @safetythirdified Рік тому

    Where have you been all my life!

  • @johng.1703
    @johng.1703 Місяць тому

    when using a grounded centre tap voltage divider you get two phases 180 degrees out of phase, this is WHY it is called the Neutral, it is at the neutral point, 0V. so when current is being drawn on both hots, one is in the positive cycle and the other is in the negative cycle. being 180 degrees apart, where these waves meet on the neutral they cancel each other out proportionally.
    it is the ground on the neutral that is important, that is what keeps it at half voltage 120v on a 240v supply, if you lose the neutral point you just get 240V as at that point there is no voltage divider, if yo lose the ground / earth at the voltage divider you get a floating Neutral, which will move up and down the wave giving varying voltage depending on the loads on each side of the voltage divider. a higher current draw (higher resistance) will push the neutral up the wave giving a lower voltage to that side and a higher voltage to the other side up to the full wave and full voltage.

  • @ochoaelectric5175
    @ochoaelectric5175 2 роки тому

    Nicely done

  • @daveculbertson602
    @daveculbertson602 2 роки тому

    Very informative video.

  • @brentcory8194
    @brentcory8194 2 роки тому +1

    Great video! So am I correct in saying in most commercial applications i.e. office buildings, schools, medical offices, etc. we should be counting the neutral due to 310.15(E)(3)?

  • @faroutdesign
    @faroutdesign 9 місяців тому

    Great video! I don’t get to work with a lot of wye systems. I have seen a 10 awg neutral on a shared system with non linear loads. Is this a code article requirement or just a good work practice?

  • @chadhardwick9214
    @chadhardwick9214 2 роки тому +1

    Dudes a correction factor ninja….😎

  • @tommywatterson5276
    @tommywatterson5276 10 місяців тому

    I remember something about neutral ampacity rating at 70% of phase voltage

  • @justd3123
    @justd3123 2 роки тому

    so clear, tnx

  • @Peace88Hi
    @Peace88Hi 2 роки тому

    Thank you prof.

  • @mikebavoso26
    @mikebavoso26 Рік тому

    Very good. Does anyone know if Dave is a professor at a nationally recognized University?

  • @warrenjtaylor8714
    @warrenjtaylor8714 7 місяців тому

    The first system is slightly wrong i thought because the coils are wound in opposite direction, so line to line is 180 out of phase. Hence the 'split'. Also tell them it's a voltage source not current source if any load asks...

  • @NeoN-PeoN
    @NeoN-PeoN 11 місяців тому +1

    Is it not the case that basically all home setups are unbalanced? I mean, no one is going through their homes and adding the amps up on each circuit to ensure they're balanced. So in the neutral is probably always carrying current, right?

    • @pld8993
      @pld8993 5 місяців тому

      In individual circuits (1 hot paired with 1 neutral) the neutral carries the same amperage as the hot and is always counted as a current carrying conductor.

  • @stevebrule6172
    @stevebrule6172 Рік тому

    I have a tricky multiple choice question, hopefully someone 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?)
    (But that doesn’t mean it’s the LARGEST in the circuit right? Because the two hot wire could be the same size)

    • @muradzeynal
      @muradzeynal Рік тому

      hey brother, did you find the answer? I want to know as well

  • @childlikefaith7257
    @childlikefaith7257 3 місяці тому

    What is the wire that runs to neutral and back to the electric company? And would that effect a transformer if it was faulty?

  • @alyssaisaackson6797
    @alyssaisaackson6797 Рік тому

    I have a 3 phase solar inverter combiner panel the load is balanced on all 3 phases. I don’t even think the neutral Carry’s current would I have to count it ?

  • @dipankarroy9752
    @dipankarroy9752 4 місяці тому

    Hey Dave! I want to solve my problem:
    This is my step up transformer which is used as an inverter from DC to AC, when this transformer outputs voltage my both wires are phases and no neutral, so how to get a neutral wire from them as most sine wave inverters create a neutral phase.

  • @morelightpm457
    @morelightpm457 2 роки тому

    Excellent video.
    JW - LU #613

  • @RustyJeepHole
    @RustyJeepHole Рік тому

    Thank you sir

  • @Victorkorchemniy
    @Victorkorchemniy Рік тому

    “Counting the individual neutral, with one hot.” I get the electrical theory, but it’s not in writing in the code book. How come ? They should add a #4 to clarify that even though is common sense, it’s not mandated in code in specific writing

  • @TM-cm4gb
    @TM-cm4gb 2 роки тому

    Quite interesting, as european i wasnt sure how US 120/240V thing works but logical ofc. Fault with open neutral would cause all kinds of shenanigans in the the system then whereas in EU system it would fully turn off the circuit. I wonder if it is a problem with devices getting destroyed etc with that kind of fault.

    • @okaro6595
      @okaro6595 Рік тому

      Three phase is common in Europe and in it the results are similar to what in the US split phase. On the other hand in the UK style single phase broken neutral puts full 240 V to equipment cases. In split phase and three phase it can be smaller than the full mains.

  • @markchidester6239
    @markchidester6239 Рік тому

    Is there a situation where the neutral wire needs to be larger gauge than the "hot" wires because it has the potential of carrying more amps than the "hot" wires?

  • @GailsonPvPwtf
    @GailsonPvPwtf 2 роки тому

    *raises hand* If you take 2 of the hots in a 3 phase service to power a 1 phase device, wouldn't the voltage be irregular since the waves and troughs of the AC current aren't oppsite and balanced? Apprentice here.

    • @WorBlux
      @WorBlux 2 роки тому

      Assuming a wye configuration - peak to peak Voltage across 2 phases is 2(cos(30)) of p2p-V on and single phase. So 208 on a 120 Wye. But it's still a regular sine wine. (Any addition of sine waves at the same frequency is another sine wave on that frequency.

    • @etherealrose2139
      @etherealrose2139 2 роки тому

      Power goes in and out both conductors. It's a perfect sine wave at whatever voltage the two are at line to line.

  • @ericthered9655
    @ericthered9655 2 роки тому

    Why doesn't the voltage increase if the waves are out of phase?

  • @possibility28able
    @possibility28able 3 місяці тому

    Where does the neutral originate

  • @TheMinecraftACMan
    @TheMinecraftACMan 2 роки тому

    For the single phase drawing at the top, where you had two separate multi-wire circuits, would it introduce the potential for any weirdness if the two non-shared neutrals were accidentally swapped?

    • @davegordon6819
      @davegordon6819  2 роки тому +6

      Good question. If the two neutrals were swapped on the right side of the top diagram it could create a big problem. You would then have the lower black wire sharing a neutral with the upper black wire. The result would be that that neutral would carry the addition of the two black wires - meaning that if each was carrying 20 amps, the neutral would be carrying 40 amps. They would not cancel each other out. It would be like sharing a neutral between two wires from the same leg (bus) in a residential panel.
      This is why when we are working with 120/240 V single-phase panels we need to make sure that if we share neutrals, we share them between one wire from one bus and one wire from the other bus. Likewise, in other facilities where we run more than one multiwire branch circuit within the same conduit, we must identify which neutrals go with which phase conductors [see NEC 200.4(B)].
      Alternately, if you tied the two neutrals together, you could entertain similar issues depending on how much current is flowing on each hot conductor...
      I plan, at some point, to make videos that focus on current flow with the various systems and point out these sorts of problems.

  • @mariogregory4922
    @mariogregory4922 Рік тому

    I like Dave!

  • @Waffel-eb2gf
    @Waffel-eb2gf 2 роки тому

    whta does it mean when you say "add heat" ?

  • @patricksmith2414
    @patricksmith2414 2 роки тому

    Would the neutral count if it were a 4-wire, 3 phase wye connected system with only 1 phase conductor and the neutral?

    • @BG-eng
      @BG-eng 2 роки тому

      Every time you have a single phase a neutral Carry the current back so that group is counted as 2 wires

  • @yusprogres5271
    @yusprogres5271 2 роки тому

    Yessss

  • @jeanv4871
    @jeanv4871 2 роки тому

    Hi Dave, my husband has some questions and wanted to know if you do one on one video calls plz let me know! Thank you!!

  • @jgryder3
    @jgryder3 2 місяці тому

    What country is this?

  • @P8ntmagnit
    @P8ntmagnit Рік тому

    What song is this?

  • @dlp7130
    @dlp7130 2 роки тому

    Hello mrs Dav.. so if the main neutral wire loose what is going to happen to the system?

    • @davegordon6819
      @davegordon6819  2 роки тому

      If the neutral is still connected but loose, it could create a high-resistance point in the circuit that would not only get hotter than it should, but could create voltage drop due to the high-resistance point being in series with rest of the circuit.
      However, if you are asking what happens if it gets disconnected, then I'll refer you to a video I just made that addresses that exact issue of an "open neutral": ua-cam.com/video/LJvyb_WujZg/v-deo.html

    • @dlp7130
      @dlp7130 2 роки тому

      Thk you very much mrs Dave

  • @brianskellenger9344
    @brianskellenger9344 7 місяців тому

    🎯

  • @pakistanian2325
    @pakistanian2325 8 місяців тому

    May Allah bless u.❤

  • @TrevorSachko
    @TrevorSachko Рік тому +1

    Balanced load, don't use a neutral. Unbalanced load, use a neutral.

  • @jgryder3
    @jgryder3 2 місяці тому

    I dont see a 310.15(e)

  • @timault8209
    @timault8209 2 роки тому

    Dave... Why do you call power carried by a conductor "heat". I 'think' I know why. But can you explain your use of that word in the context of this lecture, please?
    (Notice, fellow viewers, that I ask DAVE... and not YOU... for Dave's explanation.)

  • @grabir01
    @grabir01 2 роки тому

    Remove the earth ground. Then what you say is true.

  • @JAYDELROSARIQ
    @JAYDELROSARIQ 11 місяців тому

    There are no harmonic you need flux

  • @abdelghanich7804
    @abdelghanich7804 2 роки тому

    hello, Dave i have a question and if you have a time answer me please , first of all thanks for every efforts that you give us
    so , In a single-phase transformer input, one wire getting entry as live, another as neutral. But what would be in case of its output? In output, which-wire would be phase, and which-one would be neutral?
    pasteboard.co/dlGFszYF6Iai.png

    • @BG-eng
      @BG-eng 2 роки тому

      The system is AC, any one can be hot or neutral. but usually ground/bond is connected to one of the wire which is than identified as neutral. Let’s wait for Dave to comment further