Dangers of Multiwire Circuits 28.6

Подписаться 115 тыс.

Просмотров 8 тыс.

50% 1

“Multiwire” branch-circuits are advantageous in that they save money! But multiwire branch-circuits also present some unique hazards if not installed properly.
Find out what you need to know about the dangers inherent with multiwire branch-circuits by watching the video where Mike and the team discuss the theory behind these circuits.
This video is extracted from Mike Holt's Understanding Electrical Theory Library www.mikeholt.c.... For additional information call 888.632.2633.
For decades, Mike Holt Enterprises has been the go-to resource for electrical training. Our mission is to empower electrical professionals like you to master the Code, excel in exams📝, and elevate your electrical knowledge..
👉 Explore Exam Preparation Tips and Training at www.MikeHolt.c...
🚀 Find Electrical CEU courses at www.MikeHolt.c...
⬆️ Level Up your school's electrical training program with Mike Holt Enterprises at www.MikeHolt.c...
Whether you're gearing up for an exam or looking to enhance your electrical knowledge, we've got you covered. We offer instructor and curriculum support, a variety of continuing education options, free videos, graphics, and a wealth of valuable resources.
📌 Stay Connected:
/ mikeholtenterprises
/ mikeholtenterprises
/ mike-holt-enterprises-inc
🔗 www.mikeholt.com
✅ Don't miss out on the latest updates and exclusive content. Subscribe to this channel now - Click here to subscribe: / @mikeholtnec .

Опубликовано:

6 окт 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 19

@steven7650 6 месяцев назад

I enjoy mikes law, The most expensive piece of equipment will sacrifice itself to save the least costly.

@mj625 6 месяцев назад

I'm thankful I learned these lessons early in my career. Not everyone does, and, unfortunately, this is why we have code changes that tend to bring everyone down to the lowest common denominator in skill set, while raising the cost of electrical installs in the process.

@paulconvery680 4 месяца назад

The infamous brown neutral. Ran across a few of those and THAT is just one of the many examples of why the code updates are so important. Thanks for sharing, Mike and Co.

@bretgreen5314 3 месяца назад

Thank you Mr. Holt. I will add E^2 over RP to my P over IE, and E over IR memorized formulas. I think of all the times I have taken the long way around.

@ChaplainDaveSparks 6 месяцев назад

Fun story. When I was growing up, the voltage used to drop rather low. We could tell because the picture in our (CRT B&W) TV would shrink horizontally. The TV repairman said it was due to low voltage. We called the utility and when they came out, they said that *every circuit* in the house was on *THE SAME BUS* of our 120/240 service! An electrician came out and remedied that. Maybe the panel was wired just before quitting time on a Friday … 😀

@theseattlegreen1871 5 месяцев назад

Great information Gentlemen

@michaelhealy7005 6 месяцев назад

I’ve seen overloaded neutrals many times due to what they talked about…. A 3 wire cable with both circuits on the same phase due to installing on a tandem breaker. I’ve also seen lots of expensive equipment burnt out due to losing the shared neutral when the circuit was wired on a proper 2 pole breaker so each wire is on their own phase. This stuff happens a lot.

@georgestrosina1316 День назад

Mike only brushed over the fact it could be the utility company/service. I have been to several calls where the problem was at the top of a service periscope, weather-damaged, and also at the back of the service entrance behind the meter. (It's odd watching the dishwasher come on and other items in the house dim or stop working., then the dishwasher stops and everything else becomes brilliant.

@33electric33 6 месяцев назад

I've seen this a couple different times where the main neutral at the electrical panel or meter socket became so corroded at the termination point that it drops connection. Equipment burns up real quick.

@harleyj3938 6 месяцев назад

Anytime you install a tandem to create more space. You have to payatention to what your doing.

@dandearman2871 6 месяцев назад

We didn't loose a neutral but lost a phase to out factory. The voltage to one of our furnaces was low enough that the heater contactors could not pull in but the voltage was still high enough that it burnt up the coils in the contactors because of the high current from not pulling in.

@PHILBUSHMASTER 6 месяцев назад

Good topic, I enjoyed the panel of “Toppers” LOL

@MrKen59 Месяц назад

Good news is many new devices can run between 120 and 240 with no change. Today’s computers support dual voltage for the most part as well. Probably has a lot to do with global market.

@NipkowDisk 6 месяцев назад

I still refer to them as Edison circuits... showing my age.

@professorg8383 6 месяцев назад

Edison did use 3 wire DC distribution. Back when they wee debating AC vs DC, Edison's 3 wire DC could easily be switched to split phase AC without modifications. Edison had a lot of installed lighting systems and many, many of his 110 volt DC bulbs in service. The bulbs worked fine with either AC or DC. Technically, Edison lost the war of the currents, but he still made a lot of money selling his light bulbs. In the long run, AC was better for distribution and 110 volts was safer than 220 volts. It worked out quite well and was a more efficient way to distribute power.

@jasonmarroking4357 4 месяца назад

Does anyone know Mario’s Instagram or info ? I would like to follow him he gave some great information!

@MikeHoltNEC 4 месяца назад

Mario is part of Mike Holt Enterprises and his personal Instagram account does not have anything electrically technical. His account is 'Mario.Valdes_'

@walterbrown8694 5 месяцев назад

Your illustration showing the "Correct Way" of wiring of 2 branch circuits is also incorrect Mike. The way I've always done it is to use an individual neutral paired with a "hot" all the way from the respective panel for every branch circuit. (Your illustration seems to show a shared neutral for the 2 branch circuits)

@MikeHoltNEC 4 месяца назад

Lol... a multiwire branch circuit is permitted by the NEC, so it's not incorrect. If my video is about a multiwire branch circuit, then I need to show the multiwire circuit. Not two separate 120V circuits. Hope this helps...