310.15(C) Ampacity Adjustment Factors

Explanation of 310.15(C): How and why we adjust ampacities when we have more than three current carrying conductors sharing a raceway or cable.

[zanelewis]

As a 4th year IEC apprentice, I wish all of my teachers had your skill and passion to teach. Thanks for filling in the gaps, look forward to many more videos

[buildingcodegeek]

Dave thanks so much for creating the videos!!! I have been a licensed electrician since early 90's and have been in many classes. Your explanations and teaching methods are excellent! Apprentices to Journeymen will greatly benefit from your videos and explanations!!!

Dave please do a video on continuous loads and ampacity adjustment calculations when both are a factor in a conduit run?

[stevenscott]

wish these videos had been available when I went through my apprenticeship in the IEC twenty-three years ago. I'm now a second year electrical instructor for ABC of Iowa and use your videos regularly in my class. Your method of explaining is wonderful (especially the open neutral demonstration). Thank you for making these.

[stephenspears]

I've been teaching apprentices in the field correction factors on scraps of drywall during breaks for years. From now on I'm just sending them links to this channel. Thank for getting me back my lunch breaks!

[waynr]

I'm not an electrician but I do have an electrical engineering degree and am working on passing my local homeowner's electrical exam so I can pull my own permits. Your videos are super helpful! A couple suggestions I have for future content:

* Service and feeder load calculations
* Load calculation guidance specifically for level 2 home EVCS which isn't covered very well at least by NEC 2017 Article 220 or 625.

Actually, given the massive amount of EV charging infrastructure in general it would probably be good to work on a series exploring best practices and code guidelines around that - both commercial and residential charging.

[ibbriley]

Probably the best explanation on derating I have seen. Of special note was the use of the thhn or 90 degree rating. I believe this to be the most misunderstood aspect of the entire issue. Thanks.

[TheBlairHouseProject]

So much better explained that Mike Holt's poorly edited endless rant. Thanks Dave!

[davidjackson]

Thanks you Dave, excellent depicted analysis and like the visuals aid of magnets as bullet points.

[jaredfournier]

By far one of the best teachers I have ever seen...better than mike holt 100%

[lanceuppercut]

Awesome video, thank you for being so thorough and understanding. I'll definitely be watching the rest of your videos.

[josegomez]

Super helpful. You're a great teacher. Wish you the best

[derricksample]

Thank you. I am a 3rd year student and this lesson was immensely helpful ✌️

[mikebavoso]

Who is this man? He is doing a great job on his videos. I have been a licensed C-10 electrical contractor for 40 years. His material is wonderfull. This is all information that I had to learn the hard way.... by trial and error.
Thank you.

[JesseKlaus]

I've been out of the electrical world for a while (EE turned CS) but I'm wiring up a shop right now and needed a refresher. I don't know that anyone could have said it any clearer, and outlined all the specific conditions so well.

[gentlegroove]

Dave, your videos are life savers. Thanks a lot!

[lukeanderson]

Good to see you again Dave! Thanks for the video!

[HappynessSixnatus]

Thank you so much for a very good explanation you are a good teacher indeed

[gagebrosius]

Solid gold my man. Needed concise and you do that

[hoomanattaie]

He is a great on teaching, also passionate about it.

[chrisneill]

Thank you Dave! Nec is unclear on what constitutes “bundling” with regard to installing NM-B cables. Can you please provide any information that specifically speaks to this issue? Great video!!