INW Industrial Training

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@Profanity42069 8 күн бұрын

Fantastic

@give_me_my_nick_back 14 күн бұрын

If you wanted to actually reduce a voltage for classic bulbs you would need a vacuum cleaner size transformer to withstand a couple hundred watts - pretty much a welder hahaha well if it only have 2 modes then it could make run your bulbs in series to divide the voltage instead

@CharlieDelaCruz-ki7cx 29 күн бұрын

Sir. It's a Great experiment explanation. Many viewers really appreciate it... Keep up the good work and God Bless:-))......

@josealfaro888 Ай бұрын

Hello, for some reason, I get a different answer on my calculator. 225x1000/(208x1.732x0.028)=22,305.56

@FFSeiler Ай бұрын

Correct. Please look at my pinned comment. Should be first comment in the comment section. Thank you.

@Practicing_HVACR 3 ай бұрын

Great video! Most thorough motor starter video I’ve seen so far.

@DaCrunkwizard 4 ай бұрын

This Table needs some work by the NEC board. It's very confusing. Thank You for creating this video. I have a better understanding now.

@brentjohnson2277 4 ай бұрын

Great video

@r.r.m302 4 ай бұрын

Note 1 and note 2 refer to range, note 3 refers to any cooking appliance between 1.75kw and 8.75 kw. So how to calculate in a multifamily building the demand factor of (for example )10 cooktops of 9.6 kw , or 10 ovens of 14 kw, Congratulations on the quality content of this channel

@jesseward3121 5 ай бұрын

I may have missed it, but does a meter show a drop in voltage? Or does it stay at 120v the entire time?

@FFSeiler 5 ай бұрын

Yes, the effective voltage your meter would show is reduced. The point of the demo was to show that rather than reducing the amplitude of the full sine wave like an autotransformer or rheostat would, it is done by clipping part of each half-cycle of the voltage sine wave,

@ysvsny7 5 ай бұрын

great explanation. thank you

@jeffreyamoroso91 6 ай бұрын

This is a great video explaining how the contactor works. I have a similar contactor, three phase star configuration. After having a new service installed in the building, the starter question does not operate the compressor as it did when it was hooked up to the original service of the building. I noted that the magnetic coil runs at 208 V. I am under the impression that line one with line to combined using the equation 1.723 makes 208 V to operate this starter coil. All the heaters are working perfectly along with the reset reset button and the push in button to check motor rotation direction. The contactor contact points are in perfect condition. I was wondering if I connect line one and line 2 together I will get the necessary voltage required to fully power up the magnetic coil. Your thoughts will be greatly appreciated. Thank you.

@nspro931 6 ай бұрын

On Question 8, shouldn't we be using the line for 10 appliances total instead of the line for 5 appliances twice? It would give a smaller final number due to diversity.

@dwaynemartin362 7 ай бұрын

Really was very helpful.💯👍

@NameLast-wm5je 7 ай бұрын

if idiot or if not fighting off idiots. You are either good at fighting, which is funny and not usefyk or you pretend to be like that guy from Misssio9hn nimposssssible

@dannyrichards6835 9 ай бұрын

Thank you for the very helpful video!

@allie_mandalakis 9 ай бұрын

Great video - very informative!

@abramporras7877 10 ай бұрын

Could I use this for a standing fan that is 120v to adjust the fan speed ? My wife always complains about being to hot and to cold and I want to add a dimmer switch by the bed so she will stop complaining 😂😂😂 thanx for the video and if you don't have time to answer I also understand.

@FFSeiler 10 ай бұрын

It is better to use a fan speed control for that application. In the future I plan to make a comparison of the output of various types of controllers. Thanks for the question.

@abramporras7877 10 ай бұрын

@@FFSeiler Thank you, very much appreciated.

@alantorchia6674 Жыл бұрын

Do we size feeder conductors and breaker according to demand load?

@FFSeiler Жыл бұрын

The branch circuit conductor and overcurrent device may be sized to this table. See Note 4 of the Table 220.55. Also 210.19(A)(3) gives minimum size of circuit as 40A. eg. 12kW range gives 8kW demand = 33.3A. Install on a 40 A circuit.

@alantorchia6674 Жыл бұрын

@@FFSeiler do you size a 16kw double oven to the nameplate according to note 4?

@alejandroquinones5439 Жыл бұрын

Great Video. Is Current SCA = 14.6A on the Primary or Secondary side?

@dblake32 3 ай бұрын

Notice that you calculate the short circuit current using either the rated voltage or the rated current of the secondary. That should give you a hint that the SC current you are calculating is on the secondary side of the transformer.

@davidrsmith2417 Жыл бұрын

When electricians that say a dimmer reduces the amount of voltage the bulbs receive, they are Exactly Right! To be precise, they should say the 'RMS voltage' which is for layman the working voltage fed to a resistive load. Any quality voltmeter that can read AC True RMS Voltage will measure the voltage reduction as you vary the Dimmer. Just because the dimmer voltage waveform is strange looking to a novice, doesn't change the fact that this strange waveform shape does not represent a reduction in supplied voltage to the bulbs. Look into any Engineering Calculus II book under Integrals and then look up 'RMS'. Experienced engineers can look at this familiar TRIAC / DIAC circuit voltage waveform and give you a good approximation of the reduced bulb RMS voltage provided by the dimmer.

@Eduardo_Espinoza 11 ай бұрын

Good read, thought it was a the duration that was reduced.

@icevariable9600 Жыл бұрын

I've been studying Article 220 for close to two months now. For this specific section pertaining to ranges, 220.55, this was amazing. This is, by far, THE best instructional video on that section. You have no idea how this has helped me.

@antoniohernandez7171 10 ай бұрын

dumb question.. if the percentage is 20% why does he multiply by 1.2? isn't 1.2 = 120%?

@bismark2773 Жыл бұрын

whoa thank you sir

@gustavotrevizo6957 Жыл бұрын

Great video, good explanations...!!! Years ago i took a motor control class, the instructor assumed that we already have some knowledge about it, but every body were in blank and was a very difficult class...😂

@danielpiggee4935 Жыл бұрын

Thanks

@SB-dc9qb Жыл бұрын

Yeaahh watched again!

@iSOSiCKLE Жыл бұрын

Thank you so much for explaining this. Sat in a four hour class last night and the instructor couldn't explain it anywhere near as good as this.

@Shiva68 Жыл бұрын

Thank you so much sir.

@SealTooGreat Жыл бұрын

Why light flickering is absent while dimming? The oscilloscope clearly shows the pulses...

@FFSeiler Жыл бұрын

The frequency (60 Hz) remains unchanged. It is faster than the human eye can detect flicker in a filament lamp. Also with an incandescent light bulb, the glowing filament dampens any flickering effect even at lower frequencies. It is similar to our eyes perceiving continuous motion even at 24 or 30 frames per second for video.

@SealTooGreat Жыл бұрын

@@FFSeiler Thanks for explanation, Frank.

@davidjackson4112 Жыл бұрын

Enjoyed your channel. Excellent Q & A

@davidjackson4112 Жыл бұрын

Hi, I’m new to your channel. Very educational. Thanks for sharing!

@alvaropires6497 Жыл бұрын

Does anyone know where can I download the power wheel hand out? Thanks

@horaciocastillo1435 Жыл бұрын

Very interesting demostration video. Thanks for uploading. Can you use this setup to install it on a DC car battery charger.?

@robertdale001 Жыл бұрын

excellent!

@skow105 Жыл бұрын

Thank you for doing this. I like your prep video especially the highlighting portion. Can you make a video of everything that you highlighted with your explanations. Keep up the great content

@inw-training Жыл бұрын

Correction: I fat-fingered the solution to the three phase problem: As shown the solution is about 22,306 Amperes

@AlmightyEye Жыл бұрын

In what states are u even allowed to take your own marked/highlighted/tabbed NEC Books into testing? In my state, you can’t even take your own book, they provide it at the time of testing and they’re not marked, tabbed, or highlighted in any way.

@inw-training Жыл бұрын

Most states do. In the states that I work and teach in (WA, MT, ID, OR) the tests are sufficiently difficult to have to rely on additional materials. WA State: lni.wa.gov/licensing-permits/electrical/electrical-licensing-exams-education/electrical-examination#what-to-bring Idaho: dbs.idaho.gov/wp-content/uploads/2022/08/Electrical-Exams-Information-Bulletin-2022.pdf Oregon: www.oregon.gov/bcd/licensing/Documents/exams/el-approved-exam-materials.pdf Montana: boards.bsd.dli.mt.gov/_docs/ele/exam-info-sheet.pdf

@AlmightyEye Жыл бұрын

@@inw-training yeah, we’re allowed to take the NFPA 70, the NASCLA Contractor’s Guide for the Business and Law parts of the test, and we’re allowed to take the NTC Yellow and Blue Books, but we can’t under any circumstance take our own NEC books. Kinda sucks considering that’s the hardest part of the test and the time constrictions suck. They also changed the qualifiers for taking the exam. Work experience is no longer considered unless you participate in state sanctioned Electrical education or a few years of an apprenticeship program or a combo of both. Before, 5 years of on-the-job experience was enough. I’m in NJ by the way and PSI does our testing.

@SB-dc9qb Жыл бұрын

This is great! Thank you

@lkkota41 Жыл бұрын

Appreciate putting this together.. was very helpful

@jefferylong3613 Жыл бұрын

I have a question that I have been provided the answer but each time I attempt to solve, my calculation is approximately 5A less. What is the demand load, in amps, for a single circuit supplying one wall-mounted oven rated 11.75kW, 1Ø, 240V and a countertop cooking unit rated at 9.6kW, 1Ø, 240V? The answer given is 48.33A.

@inw-training Жыл бұрын

The given answer is correct. Second half of note 4 applies. Add the two units together and treat them as one. That gives a total of 21.35kW. Note 1 tells us to increase the Column C value by 5 percent for every major fraction of more than 12 kW. --> .35 is not a major fraction so we have 9 kW more than 12. That means that we take the value in column C for one unit (8kW) plus 9 times 5%. or mathematically that turns into 8kW times 1.45 = 11.6kW. At 240V that is 48.33A

@whatthefunction9140 Жыл бұрын

Does the circuit use the same amount of power on high as on low?

@inw-training Жыл бұрын

No, thankfully not. It uses a proportional amount. A little is lost due to heating of the switching electronics. I am working on a new video that will show the differences between different dimmers, such as the one in this video for incandescent lamps vs CFL and LED dimmers as well as fan speed controls. In that I will also talk about power consumption.

@MegaRiffraff Жыл бұрын

I’m working on a 3 phase nema 1 - 208 starter for 7.5 hp , with-start stop , start is on 2-3 , stop on L -1, There is no wire running from the O/L at the bottom where in the video you had-a neutral wire , where did it come from ? Do i need to run one , if so from where ?

@FFSeiler Жыл бұрын

Well you have to complete the circuit for it to work. I am assuming you have a 208V coil. If so, you would go from the O/L contact back to L2 at the top of the starter. If your coil voltage is 120 then you either need to swap out the coil or use a step down control transformer. My setup had a seperate 120V control power source. If you have the original starter enclosure there should be a duagram in it also. Hope that helps.

@MegaRiffraff Жыл бұрын

@@FFSeiler yes it does help , the diagram was on the box door , they said it was removed in the warehouse and they couldn’t find it , the step down transformers were cut off as well , we’re going to try put them back on Monday, thanks for the reply.

@inw-training Жыл бұрын

This diagram may be helpful: instrumentationtools.com/wp-content/uploads/2017/07/instrumentationtools.com_ladder-diagram-for-motor-control.png?ezimgfmt=ng:webp/ngcb2

@MegaRiffraff Жыл бұрын

@@inw-training thanks 👍🏻

@MegaRiffraff Жыл бұрын

👍🏻

@davep8366 Жыл бұрын

Watch video I liked it but cannot find the links to the tabs you use...

@hitechdiversions3160 Жыл бұрын

Great video and discovered via Jared. Getting one built to monitor my saw so I don't push it too far and overheat motor... which I have done once. Also subscribing.

@FFSeiler Жыл бұрын

Thank You. Let me know how you make out.

@mjmjersey Жыл бұрын

I love it

@CurrentlyRockhounding Жыл бұрын

This is awesome! I can't wait to get this hooked up and running in the shop. Thank you!

@SB-dc9qb Жыл бұрын

This is great! Thanks

@SB-dc9qb Жыл бұрын

Hell yeah!

@educationpower1823 Жыл бұрын

In the body of code book

@educationpower1823 Жыл бұрын

Also table number is the same as the section number it goes with

@FFSeiler Жыл бұрын

In most cases yes. That pattern was broken when Art 310 got a rewrite. The rules for tables 310.16 through 310.20 are codified in section 310.15

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