NEUTRAL CURRENTS IN 3 PHASE SYSTEMS - WHERE DO THEY GO TO - WHY ARE THEY DIFFERENT TO SINGLE PHASE? 

Careful! The neutral current on a balanced 3 phase system is zero ONLY for linear loads, such as incandescent light bulbs. For non-linear loads, it can be 1.732 x the phase current. The NEC specifies either separate neutrals or a common neutral with 1.7 times the ampacity of each phase. I have seen neutrals on balanced fluorescent light systems burn. Doug Stell, MS(EE)

Wow! This is very informative, thanks for sharing it with us Dave. It worth it and the best tutorial on the topic for me.

Excellent presentation of the topic for non expert in this area. Many thanks.

Crikey, best explanation yet on this topic, will watch a couple of times then attempt to write it down in my own words, which is how I then manage to soak it into the memory bank and be able to recall it at with understanding from then on. Brilliant narration and clear graphic representation, many thanks for providing this content.

I love this kind gentleman, and thank you for sharing this brilliant information. Thank you.

Thanks again Dave I appreciate the knowledge shared 🙏blessings.

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

Beatifully explained

Thank you so much!.

Fantastic, thank you. Very much look forward to the balancing tutorial, coupled with PF issues & correction? possibly three tutorials there ;-)

Thanks Dave--interesting video

for the first time in my life i understand what happen realy and what neutral means ...thanks a lot

Superb sir good explanation 🙏🙏🙏

I have achieved what I want. Thank you🙏

thank you

Spot on 👍

Great explanation

How about if you have 2 power source like AC & solar power, Is it okay to have different grounding system for solar inverters that is neutral grounded to metal case/housing then TNS output? Of course has an input of AC TNS also...

Hi how are you. Useful topic.

Thanks Dave for sharing this with us. But, I've still some doubt about, what can neutral do to the supply if any currents flow along it (neutral) ?

So question. When you go to motor say in an industrial setting. That one motor would be a balanced load since the 3 legs are just connected to one device. Im a first year apprentice trying to understand thanks, hunter

Howdy. Great. Usually the neutral current is no larger than a phase current. The neutral cross section may be the same as a phase cross section. And thicker than 16 mm2 copper the neutral may be half the phase, yet at least 16 mm2. It should be noted though, that early age frequency converters generated so much harmonic reactive current in the neutral that it needed be at least 25 mm2. Best check the specs before commissioning. And there is a situation when the neutral will carry more current than any phase. This will theoretically happen if there is a heavily inductive load on one phase and a heavily capacitive on another phase. Best be aware of this possibility. Capacitive loads are rare though. The Code does not recognize this case. What could produce capacitive loads ? Over-magnetized synchronous motors will generate capacitive loading. Some "bulb-head" may think connecting a capacitor bank to a receptacle removes spikes and harmonics from the mains and delivers clean sine wave to one's HiFi system. It does. Yes. But best be aware of the possibility of strong neutral currents. Regards.

Thinks so much for this explaine you are professor i wish if you can give me some books for electrical installation where i can download him thinks

Need to do some work on this.

In the video you say something like not all 3 phase systems require a neutral. Can you make a video about why and when a neutral isn't needed?

Great explanation. It's a mystery however that so many people in England use SAT and STOOD indirectly. They are SAT is not correct English. SAT is past tense. They are SITTING is the correct English.

What happened when we lose neutral conductor in unbalanced 3 phase system?

So out of 3 fellows any 1 fellow alternatively acts as drain pipe at any one point of time! My little brain says so! FYI: After some tweaks I converted my single phase 240V variac into 2 phase 415V!

i am here again

नमस्कार सर आपका चैनल इलेक्ट्रिक हेल्प के नेम से हैं सर मुझे आपकी हेल्प चाहीये अगर आप हेल्प कर दोगे तो सर जो थ्री फेज जनरेटR हैं 50 केवीए मे उसकी पर फेज की रेटिंग 70 एम्पायर हैं वो हमारे पास हैं।। ओर हम लाइट डेकोरेशन विवाह शादी के अंदर काम चालू किया है न्यू न्यू तो जैसे हम एक फेज पर 45 एम्पायर लोड डाल दिया ओर एक फेज पर 35 एम्पायर लोड डाल दिया ओर एक फेज पर 15 एम्पायर लोड डाल दिया तो कोई दिकत आएगी क्या सर कुछ लोग बोलते है partek फेज का लोड बराबर रखना होगा नही तो अल्टीनेटर जल जाएगा ये क्या सिस्टम है सर

This Chanel is Killing The text book … the table explains everything about 3 phases and neutral…

Your channels is good but it.would be good if we got more.practicle examples. Explaining what is 3 phase in practical terms