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At 48:14 I understand what you're saying but we all understand what the intention of the verbiage is. Getting lost in the proverbial weeds is what causes the redundant complexity of the code. Stop that.

Love the conversation around ground fault and overcurrent. So let me add this. A ground fault of .005 amps activates a Class A GFCI. In no way could I view .005 amps as overcurrent. It is leakage current. Which in the protection of personal makes complete sense because there exists now a difference in potential due to a draw outside of current carrying circuit parts. The bonding helps with the difference of potential but leakage current means leakage voltage. Not necessarily full range overcurrent. But a form of an overcurrent based on the circuits demand.

Tom best of luck to you, Bobby Jo, and Maggie. I know it will work out great. Safe travels and quick and complete recovery for Maggie and you all after the trip.

Microphone 🎙️ l Keeps cutting out. Do better.

I’m not having audio issues

Is anyone else having audio issues?

Mic keeps cutting out

Beginner EE here do you have to bond the grounding system for telecom equipment to the electrical service ground rod in a building

Ground rods rule!

Morning Tom Robert from Omaha greetings thanks for all your doing great effort is appreciated

nice

What a terrible transmission

Is there a trigonometric number in complex analysis?

The definition convo is amazing. The .2 for the win!! So funny!! Just like having parts inside articles like 210 for I don’t know circuits over a 1000 volts. Last I checked a branch circuit is a branch circuit.

UL 1741 “Blackhole” is such a great description of that PV standard. Well done Tom!!!

I work on German, Swedish and Italian made machines all the time ( steel mills and heavy fabrication), what you just said - is bunch of garbage!!! Some Italian manufacturers do make subpar equipment, sometimes! But not German or Swedish!!!

Was an electrician for 50 enjoyable years. Never once came across a panel made outside of the USA with a UL or other agency label. Worst was a $10 Millon state of the art custom made in Germany machine. That and the older machines from same German company had every start stop push button wired incorrectly. If you held in any of the stop buttons and held in the start button machines would run. Too many foreign panels use undersized wires but often went the extra mile to install a GFCI 15 amp breaker to supply 120 volt control power.

@40:10 The “Noalox” sort of Anti-Oxidant compound might still be a good idea just in case of water ingress.

Testing is energized work. The potential is there until it is verified for absence of voltage. Using a portable test instrument first on a known live voltage source. Then on the “potentially de-energized parts” for the absence of voltage. Lastly the test instrument back to a known voltage source. Then you can say it is de-energized. Still have to meet all the requirements of article 120 of NFPA 70E then we have an “electrically safe work condition”.

Great topic Tom. I would add to the discussion that “examining” from 110.26 is done while energized because we have to test for the absence of voltage at the point of work “non fused disconnect” and the testing for the absence of voltage is defined as “working on” in 70E. Then we can establish an electrically safe work condition. To preform the maintenance

Yummyfudge, I replied to your comment but I don’t think you can see it unless you click on it to see a reply.

Yes Ryan and Tom, the complexity in residential is outrunning typical skill sets of electricians that only do residential. Those of us staying sharp on code for comm/ind are not mindful that the typical resi guy has never actually calculated fault current, IE, and PV/energy storage, and the generator craze. Transfer switches are new to a lot of them, even surge protection. Some are still resistant to AFCI/GFCI and even advise the homeowner to remove after inspection! Load management systems and EV are challenging them as well. The new sections of the NEC that include dwellings that are easily understood by “code people” and those experienced in comm/ind are really challenging and even the concepts are unfamiliar because they have never dealt with it before. The IEAI should press for special education programs for topics that are new specifically for dwellings and recognize that the people in this sector need education from the most basic concepts and up.

250.4 charging statement tells us the perscriptive rules to achieve the performance requirements in art 250

Hello Nehad..

Smash all thumbs today hello David greetings

Remember to smah that like button!!

Remember to smah that like button!!

Hey Tom. Just about missed this. Remember captain Kirk...

The compilation of statistics data with the details of the causes is vital to prioritizing efforts to improve. We have to know what specific areas will reduce mishaps and increase safety the most, to allocate resources.

What is found in the field is proof, and the fixes should be prioritized by actual statistics of losses which represent the highest likelihood even if it’s lower severity.

It’s definitely worthy of discussion, and probably needs a multi faceted approach to increase compliance down at the installer level. The same situation applies to tap rules, multi sources, and SCCR/AIR compliance.

The eng. plans are sometimes without enough detail, as they assume 450, 240, and 408 will be followed by the installer but it fails. Even inspectors miss it.

There’s not a way to blend the codes, from what I see, it’s the installers that are making the mistakes more than the engineers specifications being wrong.

I agree with the other comments here, there’s too many lug fed panels off of secondaries, and even with feed-throughs, disasters waiting to happen.

I share your sentiment with respect to the confusion caused by the necessity of “bouncing around”. We understand why, but in the field, it does result in errors. Bread crumbs is a great analogy.

Such a great conversation. Thank you for this stream. These conversations are immeasurable in value for all of us in the industry.

The man, the myth, the legend. Dave Williams!!!

GFCI is not protection from electric shock

Receptacle Outlets, Switches and Utilization equipment, OH MY! Joking aside, if these folks are making comments on how another CMP is doing something crazy, I'm going to believe them at face value even not knowing the details, I've heard enough from both Ryan and Thomas to know they have good thinking parts installed in their brain holes. TL;DR: Stop calling things like an AC disconnect a switch. There is nobody who interacts with it like a light switch in any way whatsoever, and it should have the same or similar branch circuit protections as other things that provide power from the permanently installed wiring of my house out to the equipment that uses it. I hope I can be that fresh set of eyes however and get the attention of both Thomas and Ryan (sadly tagging on RUclips is not allowed anymore), that this topic needs clarification, not a radical change to a receptacle outlet, and help that 'fourth person' sitting on the three legged stool be more empowered to do the right thing, the first time, every time. I'm going to try and respectfully disagree with Ryan (at least in part), and I think Thomas as well. I think the clarification that needs to be made to simplify and clarify this is through the definition and understanding of what a Switch is, not a receptacle outlet. I've got a few examples. As you brought up, a light switch in a bedroom is not the utilization equipment (for things like GFCI requirements and such) it's the luminaire, or lighting outlet.. whatever you wanna call it. That is where the utilization equipment is, the light bulb. And if it is outside, odds are the lightbulb outlet (whatever you wanna call it) needs GFCI protection. For an HVAC unit, such as a heat pump or AC outside the house, even when it drives some type of head unit inside (like a mini split) where does the premises wiring system stop, and the equipment begin? I'm going to suggest that the premises wiring system should end at the service disconnect, where the power is then sent through a conductor (usually something like THHN in a conduit, but often enough it can be a cable or cord assembly). And I don't think that it should be considered a switch in the same way a lighting switch is considered a switch. Their functions are very different, from both a practical standpoint, and a safety standpoint. (NOTE: I'm going to be intentionally non-specific in describing certain parts the electrical system) 1: It's nothing like a general use switch, like a light switch which is primary used to turn on or off the equipment, anywhere from a handful to dozens of times a day. Read: Flipped on and off all day every day. 2: It's not really a receptacle outlet either. Some things like my soldering iron, I may plug in and out many times a day, others like an alarm clock or a lamp, I'll plug it in once or twice a year at most. But in either extreme, it's a simple device that is super easy to connect or disconnect, and universal between devices. 3: It fall into a category of devices that are not controlled, turned on or off as a normal part of their function, or otherwise, at either the actual equipment, or the location of the branch circuit of the premises wiring system where power is sent directly to the utilization device. Before examples, let me share a common lay persons understanding and description of how this whole scenario works. The 95% of people. I have a place with power, it could be an apartment, but we will call it a house today. It could be a TV, a coffee pot, or even a fridge. Some assembly may be required, but I plug it it, press the on button on the device, and it works. For the most part it's the same with something like a mini split. I will grant you that more assembly is required, and often that assembly is required to be done by a professional, but at the end of the day, it's mostly the same. I bring it home, it plugs in after assembly, and works. 2 key things I want to highlight. 1: The premises wiring system did not need to be changed. I had a house, it had power, I purchased a thing and hooked it up to an existing wiring system. 2: The thing I want to highlight the most is that the function of the device, turning it on or off, and generally it's controls is NOT at the device or a switch. I never setup, turn on or off my AC by going out back of the house, and changing the state of the AC disconnect. The disconnect is where I want the GFCI protection to start. The function, turning on or off is handled by a separate control device, such as a relay or thermostat. There is no ON or OFF switch like a light bulb, or anything that resembles that function. A low voltage relay is far far different than a medium voltage light switch. There are other things all around us that don't really use a on or off switch like a light bulb. For example in my world I have a couple of computer servers. I have all of my DVD and Blu-Rays on one of them, and like my mini split, they were connected to the power (in this case a 240v receptacle outlet) but once plugged in, power is on and stays on unless there is a problem. Like a low voltage thermostat, it's controlled by, turned on or off, everything, by things outside the scope of the NEC. But, like the AC unit out back, the NFPA safety considerations should happen just like a receptacle outlet behind a vending machine, or in my opinion at the service disconnect. By stopping describing a AC service disconnect a "switch" we improve our clarity of the function of the light switch VS an AC disconnect, ensure something like an AC disconnect has proper protection like a vending machine receptacle outlet.

I'm bummed I can't see the live comments, but I had to pause at the 24 minute mark after Thomas makes the comment about the seat bringing the three legged stool together. The only thing I can think about is asking my grandpa (actually true story) why he didn't use a three or four legged stool to milk the cow. He insisted that the single legged stool was not only just fine, but better because he could lean left or right, turn around to grab another milk pail because it was a single legged stool planted in a cow pen filled with dirt, mud and cow shit. Sometimes, a one legged stool is all you need! Good stuff. Interesting to see a little peek behind the curtains on the back and forth on how the code panels interact and come up with the next edition.

Smartest ass holes who changed two of the most used commonly used electrical terms in last 100 years. Nuetral to confusing grounded conductor and light fixture to luminare. This morning read the idiots want GFCI protection on three phase EV chargers no matter what the input power. Great when idiots want you to use a GFCI on a 480 volt type 3 EV charger that are not on the market. Jack asses are putting the cart in front of the horse again.

I think this a useful topic unfortunately the audio is very hard to hear. I wish you could also address the use of vapor barrier

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