Neutral-to-Earth Voltage (NEV), NEC 2020, (44min:40sec)

Thanks for watching, in this video Mike Holt discusses Neutral-to-Earth Voltage (NEV).

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[cwmalone]

One of the only great things about the Internet is the wealth of information that Mike Holt provides, free of charge. Thank you, Mike!

[nsh]

Mike you've been such a blessing throughout the years...I was first introduced to your books back in 2001 I was on my 2nd year of apprenticeship. May God continue blessing you and your family. 🙏

[TimPerfetto]

Thank you for your passion explaining these mostly unknown yet important concepts. And putting it out there for free.

[EricDennison]

Thanks for this awesome presentation. Now I know how to think about and describe the 10v NEV that I am seeing at my rural location (enough to hurt, but not kill).

[ridefast]

Very interesting for a UK viewer where we do things differently than that! Almost bailed at the god-credit which felt jarring, but I am glad I stayed and it made me think! We have a 3-phase transformer for each area of housing, where the low side neutral is grounded, and 3-phase+N LV runs down every street with houses connected sequentially to one of the three phases and N. Single phase is about 230V but there is about 400V difference between my live and my neighbor's live! If I want temporary 3-phase I can talk nicely to my neighbors both sides and run extension cables.

[joecrozier]

Thanks for another great video, Mike. As a utility P.Eng. I've seen both cases over the decades: cause of high NEV on the utility side -- and the customer side. Regardless, it's ALWAYS a good idea for the utility to put its own house in tiptop shape. Avoid finger-pointing. Even if you measure less than 25 ohms at the pole or pad, improve it anyway -- get it down below 5 ohms! It might solve the customer's problem. But even if it doesn't, you're still cutting the step+touch voltage risks to your linemen and the public.

[johannesdesloper]

Haha, clamp a volt meter to a blade of grass. Your video's a very helpfull Mike, thank you. I've been a power plant operator and they taught me that 25 KV is the max. for powerplant generators. Has to do with air (H2) gaps and arcing over inside the generator. And indeed that grounding and bonding video is a great vid, vieuwed it many times.

[paulshephard]

Hello Mike. Thank you for putting the Neutral to Earth voltage into perspective. A truly amazing presentation. Thank you.

[thatelectrician]

Yo Mike you the man. I went through one of California's most intense apprenticeship programs which included 8000 hours OJT and 200+ books from basic theory to PLCs and everything inbetween. I still am completely lost on a lot of subjects especially grounding/ bonding, and "voltage".

Those 2 subjects are the hardest to fully understand in my opinion.

Thank you for the content and blessing up my confusion!

[nhoop]

Great presentation and explanation of NVE Mike, i really learn how it measured the NEV to a ground referencing the amperage load on equipment house I'm an a fire alarm technician on a growing industry and safety thank you and God bless you all

[ham-radio]

Dear Mike, You are the best teacher on this subject. I use you are a reference over and over in my Ham Radio Videos. As a former Building Inspector, I always learn something new from you and your staff. Ham Radio guys like me often have many pieces of gear amounting to more than $10K. While watching and listening to your video (more than one time) i was finishing a 4KV DC power supply that can deliver 2 amps. I have to deal with ground neutral and the so called RF ground. Keeping each box at the same potential above ground takes a lot of work. Your graphic was very helpful too. Regards, Jim Heath W6LG

[brianmcdermott]

Great discussion Mike. Thanks for all you and your guests work.

[Chris_In_Texas]

In the marinas and boats specifically the issue we have there is the galvanic isolation systems which break the safety grounding conductor under normal operating conditions and then allow current to flow if there is a fault. The way they test to make sure that is working properly is to introduce a ground fault every 4 hours on the line. That is the required monitoring system required on newer boats. This however was in direct conflict with the requirement to have GFCI protection on the 30A/50A shore power cords as it would cause those to trip each time. The "fix" to this was you had to disable the monitoring system in the boats. Newer boats then started using ELCIs on their shore power inlets, and did away with the monitoring systems as well, so now there is no way by the average boat owner to know if the system is functioning properly. Our lake is a US Army Corp of Engineers lake and they have the requirement that there is no swimming around the docks to battle this issue, however nobody follows that rule. There are no "private" docks allowed on our lake, but you hear like Lake of the Ozarks with everyone having private docks the amount of accidental electrocutions is high due to very old docks mis-wired and falling apart. And that very well could be the neighbor down a dock or two that has the issue can can cause the harmful issues to exist on your dock. It would be great for a more in depth video on marinas and docks. When I had my boat in the marina I could always tell if my neighbors had electrical issues as my sacrificial anodes would get eaten up pretty quick and have to replace them so it didn't attack all the other metal on underwater on the boat. I would constantly check them and would change them in the water as needed as it was a large boat and you didn't haul it out that often.

[agyoung]

Mike your videos are great. I work for a large utility in NC and I am a protection and control tech. I have a great understanding of electrical fundamentals. It is hard for people to understand step amd touch potential so I understand your explanation.

[haight]

Mike thanks so much for sharing your vast knowledge of the subject with a smooth articulate confident delivery that makes listening to your classes thoroughly enjoyable.

[vince]

Crystal clear presentation. Thank you!!

[miguelac]

There you go Mike. You just answered 3 more questions. I used to wornder this all the time. Mike Congratulations. Hey mike I tell you I am your fan number 1 believe me.

[Shmade]

I’m here because I was doing my Mike Holt exam prep 2023 questions and some of the code questions had this as one of answers and I was like neutral voltage to ground first time I’ve ever heard of this

[MrQualifie]

Dear Mike, I am from Mexico and I really appreciate that you can teach many people. God bless you. I got the ultimate training library 👍🏼👍🏼 it going to be profitable because USMCA agreement 🤝🏼 🇺🇸🇨🇦🇲🇽

[ericschroder]

Mike, you have been an inspiration. I have learned so much about theory from watching your videos. Most amazing, you somehow have made reading National Electric Code fun!