This channel should have hundreds of thousands of subscribers. It’s a hidden gem.

Believe it or not, your emphatic hand gestures and deliberately slow monologue are actually helpful in shoving this content into my brain pan. You deliberately walk through each sentence in the code, slowly, allowing me to follow in my 2023 NEC. You're doing a good job, and thank you.

This guy is one of the best teachers I ever had. Proudly LU 46

This man is saving my career singlhandedly

Firstly, these videos are wonderful, thank you Dave. Just want to add info for another common problem, and explain language in 110.14(C). You're feeding a >100A HVAC circuit on a rooftop, conduit is exposed to the sun and you want to adjust the ampacity for a higher temperature. You want to take advantage of 90C rated conductors, but the source panelboard and disconnect terminals are only rated for 75C. Calculate the allowable ampacity using the 90C column with your temperature correction. Then compare it to the ampacity rating of the 75C without temperature adjustments. If the 90C figure has a lower allowable ampacity than the 75C figure, then that wire size can be used. If the 90C figure was higher than the compared 75C, then the wire is too small.

I passed all of the IRC code exams, B1, P1 and M1 on first attempt. I failed by one question on the first attempt taking the IRC E1 exam. There were a few questions regarding Temperature Correction Factors for conductors that I got wrong. But now that I have found the Dave Gordon videos, WOW!!! I have to say Dave, you are amazing! Explained in perfect easy to understand format. Now I will use your videos to learn to pass the IRC E1 exam on my next attempt, thank you.

Subscribed, liked, notifications on all, sharing and writing a comment. Very good content

I have to say that this is the Best Explanation of this. He made it simple to understand. Answers all the questions u might have. Amazing teacher

All that was needed was the gong sound at the end of this masterpiece! Great presentation and thank goodness for material like this. Glad i subscribed

Great video. The best temperature correction factors video I’ve seen. Thank you.

Finally i have found a video the properly explains this... I have had several electricians and web searches and other videos stating that you always adjust on the 90 degree column... I am new to learning this and that never made sense... mainly because there was also a 60 and 75 degree column... I'm starting to think a lot of things people say are based on "well that's just how do it" as opposed to "this is what the book says" and here it is... great content!

Hi Dave. Your video is the best video I've come across on this topic! Definitely described the concepts well! It's unfortunate that the code update limited the ampacities to that of "60 deg C". I wish it had simply stated the actual maximum ampacity (perhaps being redundant in repeating the ampacity values off of the 60 deg column) values per wire gauge. The use of the "60 deg C" column is really confusing. I was left with the question: "Is NM-B 90 deg C cable, or 60 deg C cable???". I now understand NM-B is 90 deg C cable, and all correction factors for ambient temperature and conductor bundling are with respect to 90 deg Cable! This would be the end of the story, but the NEC folks decided to add an upper ampacity limit as per the 60 deg C values. It's just an added on upper limit (and an important one). I suspect this was to deal with some corner cases that are not often addressed explicitly. You already mentions attics in the summer, but other unknowns might be NM-B cable fished through insulated walls... How well is the cable heat dissipated when buried in insulation??? This 60 deg C upper ampacity limit likely catches this situation pretty well too. Anyway, thanks for the great video!

The best information I ever had

Thank you for the clear and concise explanation. Cheers mate.

Probably the best nec teaching video out there.

This video answers a lot of questions

Love the way u explain

plus thank you for explaining things to me that I should already know. You are a rockstar and I will watch more of your videos and share them with other tradesmen. Edit: subscribed

Very impressive way of teaching 👍

Thank you for the very clear explanation. It answers lots of my questions.

You have a great delivery

you are a very good teacher . thank you !!!!

Good job Dave!

Thank you! Very helpful

Great video.

Dave...thank you SOOOOOO much for this video and a the few additional I already have discovered today by just finding you. You area true blessing to the world of electrical contractors and enthusiasts who want to know and follow the code to the letter! You are a true Gentleman and a Master! Example Question - If you run a 90C 6/3 NM-B wire in a location of Ambient Temp of 30C to a junction box in that location BUT then come out of that junction and right into a space 10 ft away that has an ambient temp of 70C with 4/3. Do I only adjust amperage based on the higher heat on the 4/3 (since its the wire size in the higher heat) or do I have to perform my adjustments based on 6/3 (since this feeds the circuit at the junction box in the lower heat)? Thank you if you can please make this clear!

Well explained. Thanks so much.

Thank you good sir for your hard work 🎉

Thank you for information you are sharing it here, it is really useful

Salute! Good explanation, would like to see more examples.

Great instructor

Thank you 🙏

Worth noting that there is an exception in the code that states when using XHHW-2 conductors they don’t have to be corrected.

Thanks again...

helpful video thank you

thanksssss a lotttt!

Thanks

super👌👌👌

What about some people say when ampacity is corrected by temperature and ajustmente, is not necessary to apply: 110-14 (c), 60C column for 100A or less circuits. ¿Is it true?

what about adding 60 degree terminals into the mix with 90 degree conductors going through a boiler room at 121 degrees?

does the calculated roof top temperature become the “ambient” temperature, needing only one temperature correction or do we do two calculations 1 for ambient, one for distance from roof?

What ambient temperature should be used for directly buried raceway/cables?

But in 240.4(D) Small Conductors you can also find, Unless otherwise specifically permitted in 240.4(E) or 240.4 (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied. It looks like this statement omit the insulation types, for example #14 AWG copper can only carry 15 A at most, no matter what kind insulation it is. Please help me to understand this, thanks!

Are your lectures available in sequence on LinkedIn?

do I still need to add 25% for things that run a long time?

Thank you for sharing your knowledge and experience 🇵🇭🫡 Always keep safe and in good health ❤️

Is there ever a case where you would use the 75*C column for a 90*C rated cable?

wich column should we use 60, 75 , 90 ?

Where in the world have you been in my entire career...?

With the increase in outside temp. the current going through the conductor decreases due to increase in the resistance. But why with the increase in the temperature allowable ampacity is increasing? As it is varying from 60 to 75 to 90.

Still confused.

In other words, derating is all about ambient temperature and that’s it