240.4(B) - The 'Round-Up' Rule

Explanation to help in understanding NEC 240.4(B) "The Round-Up Rule" for conductor protection, in which I also reference T-310.16, 240.4(D), and T-240.6(A) from the 2020 NEC.

[michaelstora]

I love that you give reasons. Those who don't usually don't have the same level of understanding. "Why" is not a four-letter word.

[tfun]

Bro....how are more people not watching this dude. He’s legit!

[pietervanderbeek]

I've been in the industry for 15+ years and I've never come across an instructor that is more concise and clear. Straight to the point and done with wonderful cadence and delivery. Cheers Mr. Gordon. You are a blessing indeed.

[johnstempko]

Seconding all the comments, this man is one of the most gifted instructors I've seen. Keep the videos coming Dave!

[johnbowser]

Dave your a bomb teacher. You make transformer/ electrical theory very easy to digest.

[EdgarNedelAnguloCastro]

Dave! This is awsome! A was stuck in a loop trying to desifer 240.4(B)(2). You have helped a lot bro. God bless you in Christ. Best!

[dimdio]

Good morning Dave
Can proudly say I passed my Journeyman’s first try yesterday. Thank you for all your information, insight and help over the last year. For anyone else going for that J card, it’s possible. Stay consistent, stay focused, you got this. Stay safe out there brothers! 👊🏼💪🏼

📍 Boston, MA

[amangaur]

You are a great teacher Dave. I really admire you and your work!! Thanks for your videos😊😊

[puertadelaestrella]

Although I knew all the info beforehand, Dave’s explanation was stellar! I’ll certainly forward this to my colleagues

[soundman]

Best explainer ever, so coherent and slow, and with so many good examples to back up the material. You are a great teacher!

[АнтонСиньковский]

You are a great teacher Dave. I really admire you and your work!! Thanks for your videos

[idealalaska]

Fantastic easy to follow explanation! Thank you for sharing this.

[jaimearellano-rz]

What if the load is calculated to be 120A According to this rule, I can use a 125A circuit breaker along with a #2 cable rated for 115A.

[derek]

You are a very good teacher...wow! You simply don't see this level of detail often. Thank you!!

[paaapppermaker]

Can anyone point out the code that refers to the “calculated load” on the conductor. Sounds like as long as the calculated load isnt over the wire ampacity we can round up. But i dont see anywhere in 240.4 about the “calculated load”

[seantreakle]

Dave do you have classes. And if so where are your classes held.

[MidnightWolfSDJ]

Does this mean if any of the 3 rules gets violated, you round down to the lower amp? Like if I have an ampacity of 27A and the branch circuit has more than 1 receptacle, do you round down to 25A breaker/fuse? That is how I interpret the exceptions to the “round up rule”. Asking for the journeyman test.

[chadgerman]

Thank you for this awesome video! Keep up the great work

[UrNemesis]

He's so good that he's ambidextrous. Great video as always

[hyagosilveira]

You said after derating you can use the next size up. The 2017 nec says “ without overload trip adjustments above its rating” what does this mean? I’m confused