Derating of Conductors Explained

In this video we discuss why we need to derate conductors and how we do it. We look at the NEC 2014 and how it is understood.
Art.310.15(B)(3)(a) in the NEC 2014 that will give you the chart to figure out what percentage to use.

[@tylerbiggs9474]

you seriously just made my life so much easier. i have been struggling in school but watching this video made everything so much better and i got an A on my test. please dont stop making videos

[@danieljudkins7974]

Craig, I have been watching your videos since I started my apprenticeship. I take my JW exam next week and am brushing up on some things by watching your videos. Thank you so much for posting your videos.

[@meilissawang2807]

You’re a excellent teacher body your explanations your tone of voice everything I feel very easy to catch everything you’re teaching

[@izdagrimeyone]

I literally played this video, for the past 3 hours studying all day. Using the 2017 edition.Table 310.15(B)(16) yet the top reads 310.60 on pg 70-150. That was messing me up. Now that I tabbed my book that was half the battle. Turn the page and find #of conductors This video is so perfect for load calculations. Cut the search down by a lot. Keep up the good work

[@TheTantanski]

My first time managing a small project, this helped me clear things up.!!! Thank you.!!

[@benfullerton7931]

As a brand new JW, this is awesome, thank you so much.

[@CGV5280]

I'm in my 1st yrs. 1st semester 6months in the trade. Your a great instructor. Thank you for the video's.

[@concepcionmariera2162]

/// FIRE !!!! QUICK AND SIMPLE. I LOVE TO LEARN THIS WAY. THANK YOU.

[@RicardoDelgado-zr4ki]

Another great video sir, thanks for the breakdown, my professor wouldn’t have the patience

[@peterponcedeleon3368]

I really appreciated the tutorial! Please make more. I have been a tradesman my entire adult life. Turned Financial Advisor, now working in the content monetization space. I loved it!!!!

[@danieldyer9177]

I've been busting my brain and you made this so easy to understand take you very much

[@jessegravesgraves4749]

Believe it or not , I actually learned the most from you. ! As far as KZbin channels are concerned.

[@jarrydee2799]

Thank you for this. I am taking my J-man test end of Nov. and I just KNOW this stuff is going to be on the test. Thank you for making it easy!

[@craigmichaud-electricalins4602]

Good luck!! CM

[@big40glock84]

Thank you for making this video brother

[@philmiller9376]

Heat is the Enemy. Nice Video

[@craigmichaud-electricalins4602]

Thank you for watching!! It is a great thing for people to understand. We don't just pull wire and put up lights. This is why we charge for our knowledge.

[@nicksince91]

My dude craig coming with straight knowledge. Much appreciated.

[@Artikgrau325is]

Very well explained, derating always was somewhat a mystery for me, and I've only pulled whatever size I was told to pull. Now I have more knowledge to do a quality job in the field. Thank you.

[@davi-un7ku]

Thank you sir extremely good explanation, none of my teachers explainations where clear but you did it with ease! The apprentice thanks you

[@lanceuppercut5939]

Awesome video, very easy to understand thank you.

[@joseovelasquez6264]

Craig great video this is making alot of sence now Am taking a electrical system code and theory class at my school and we are going through de rating conductors and also Over current protection devices but this video helps alot more thanks for sharing with us about the NEC

[@jarrydee2799]

I wish you were my boss!! You seem like a nice guy, with lot's of knowledge

[@craigmichaud-electricalins4602]

I enjoy what I do so I love sharing my knowledge!! Your to kind!! CM

[@whatsreal7365]

Appreciate the info brother!

[@KenKaneki-xh7by]

This helped me out far more than class did. Thank you so much.

[@EastCoastSparky]

great explanation thanks!

[@TuberKMT]

Super helpful and simple to follow. Thank you! Subscribing!

[@aaronfidelisrecine]

OMFGGGGG IT MAKES SENNNNSEEE THANK YOU!

[@mark_torresx3]

Nice thank you so much is very useful. Keep the videos coming I’m subscribed.

[@rubygarcia516]

NEC 2021 TABLE 310.16 & 310.15 (c) (1)

[@ArelSprite]

Excellent explanation!

[@realspillmidwestboxingtalk2139]

Great breakdown

[@juanramirez-mp4uk]

I really liked your video. I'm going through classes and helped me to catch up. Thank you.

[@paulanthony4089]

Great explanation. Your videos help so much with my studies. These books are confusing. Keep it up!

[@peterjenkins886]

thank u craig quick to the point and very clear with instruction

[@flacoeloco]

Very good explanation, always wondered how to derate, you just made my life easier, don’t stop making your videos👍💯

[@ricardocolbert5493]

Ok ,I hope that you are experiencing a complete recovery, I will be on alert for your post some time in March thanks for responding, hope to remain in contact w/u be safe.

[@mattc41854]

Hey that was a great video!!! It really made sense of this sweating thing. I never really understood it but your video was really easy to understand. I’m going to check out your other vids. Thanks again

[@clavelarmandojesus4048]

You don’t have an idea how values this is for me . Now I have to do my homework on NEC . Thanks

[@milan512]

Hello , You’re videos are bad ass !! 💯

[@craigmichaud-electricalins4602]

Thank you very much!! CM

[@CommunityGuidelinez]

Over the years I've noticed a lot of guys ask if a neutral is considered a current carrying conductor, so I've adjusted my vocabulary from "hot/neutral/ground" over to "Ungrounded Conductor/Grounded Conductor/Grounding Conductor". I also make sure I spend plenty of time with them on Article 💯. 😉

[@1brrooke1]

Grounded and grounding conductor are two separate things. Don’t know if you caught that.

[@CommunityGuidelinez]

@@1brrooke1 Thats right. As I said, Ungrounded Conductor(hot), Grounded Conductor(Neutral), and Grounding Conductor(Ground). The terminology of Grounding Conductor is misleading because the ground is not considered a current carrying conductor, it's only there to provide a path for available fault current. 👍

[@MikeJones-nm8qt]

Hi Craig!!! Love your videos!!!

[@ready4itall89]

Just want to give you props. Very well done. Made simple

[@fishmasterdan]

Thanks for making videos. However I would like to point out derating is based on conductor type. Most our conductors today are 90d not 75d like the video. After your derating has been calculated you then cant exceed your termination ratings . Ie #10 rerated to 50% is 20a which does not exceed the 75d column if your using 75d terminals. In this example you could use 20 #10 at 20a in 1" emt.

[@8yerbrain]

Thank you for your excellent explanation.

[@levarmenifee3065]

Good tutorial learned this in class today

[@craigmichaud-electricalins4602]

That is awesome. Thank you for watching. CM

[@ig3024]

Idk how to ask this any easier way but does conduit size change the derating factor? For instance 9 c.c.c #12 20amp breaker (70%)maximum without derating Through 3/4 conduit. Does this still stand for 1” or 1 1/4 conduit. Since the conduit is larger less heat? If conduit size doesn’t matter then how could this formula stand for 9 c.c.c #12-20amp breaker through a 4” conduit? If I pulled 10 wires would I really have to Derate?

[@bernieromero5597]

cool video, makes it easier to understand

[@gengizaghdasi]

Thank you this was easy to understand

[@craigmichaud-electricalins4602]

Always love positive feedback. Thank you for watching. CM

[@PeymanSultan-wn6iw]

Thanks

[@icevariable9600]

So, I'm wondering if it would be cheaper to run one 1" EMT with 10 conductors at 50% ampacity, or two 3/4" with 5 conductors each, at 80% ampacity. Or what the hell, maybe throw up 3 1/2" EMT with 3 conductors each, all at 100% ampacity. Lots to think about. Thanks a lot for this awesome insight into a very perplexing part of my job.

[@JesusCruz-wt2zp]

Would you make a video about when we count neutral as a CCC and when not

[@mstrlucky652]

you're supposed to use the 90-degree column when applying adjustment of correction

[@buddhalovechild]

Excellent. Thank you.

[@phantomjoe86]

Thank you so much

[@guadarramarichard]

so if u up the wire, the breaker size stay the same?

[@miguellopez6328]

Thank you very much !!

[@jorgeceballos8308]

What abuot with two diferent gauge of wire in the same pipe, what's the proces?

[@mattrob15]

I don't think it matters, but you have to debate each wire accordingly.

[@mikegardiner6639]

Your awesome... One question when de rating do you include the nuetral? So all my wires if I had to bump them up to the next size would all have to be a number 6 including the nuetral? And one more question. Can you legally go done one size with the nuetral and 2 sizes with a ground? Thanks for your knowledge. You make learning extremely fun.

[@KLAWNINETY]

The neutral is a current carrying conductor, so you have to size it accordingly and include it in your pipe fill and de-rating calculations. You also do not need to de-rate the ground as far as I know since it does not carry current, for example if you are using a #10 de-rated down to 20 amps you can still use a #12 ground, you don't actually have to upsize the ground to a #10 the way you would if the #10 hot was being used for a 30 amp load.

[@mikegardiner6639]

@@KLAWNINETY thank you makes perfect sense

[@ricardocolbert5493]

Craig I’m subscribed to your but I never receive any message when you post new videos. I study your post. You teaching method simplifies many areas of the electrical code, that are often difficult to grasp. thanks in advance Rick

[@craigmichaud-electricalins4602]

I will be starting back up in March!! Had some health and family issues! Thank you for subscribing!! CM

[@grassrunner7983]

Nice

[@daddyd1500]

Hey Craig, I'm new to your channel. Great content! Thank you! I see this quite often. Multiple romex stuffed in a single hole. Any information would be greatly appreciated

[@vasiqshair]

Excellent!

[@patrickgreen9486]

In your example are you accounting for the neutral conductors in your four wires? And also what if you have three hots in your circute? In that case how would it work with six current caring conductors?

[@craigmichaud-electricalins4602]

The nuetral is always counted as a current carrying conductor. So if you have 6 wires and they are current carrying then you calculate them according to the code. Hope that explains it better for you. Thank you for your question. CM

[@jeanious2009]

After 3 current conductors, does the neutral count as a current carrying conductor?

[@craigmichaud-electricalins4602]

Yes the neutral is a current carrying conductor!! Thank you for your question!! CM

[@edwardsmith4353]

any chance of updating to 2020 NEC code?

[@jorgehuizarsr1630]

hell yea made sense thank u sooooo much

[@brandondenton494]

Is the neutral/ grounded wire a current carrying conductor?

[@craigmichaud-electricalins4602]

Yes it is! CM

[@MrWom80]

Does a feed and return (SL) in one conduit, consider to be ALL current carrying conductors? Example: 12/2 feed switch, 12/2 return back, but route threw a T fitting to another location.One conduit has (2) Blk & (2) white, same circuit. Is this 4 current carrying conductors?​@@craigmichaud-electricalins4602

[@educationpower1823]

Interesting that you call it debating The code got rid of that term and identify it as adjustment or correction. Just curious..

[@82Ismael]

Question a current carrying cunductor also includes a neutral wire? Also thanks for yhe video

[@craigmichaud-electricalins4602]

Thank you for the question!! Yes the neutral wire is considered a Current-carrying conductor. Thank you for watching my video!! CM

[@86aoshi]

@@craigmichaud-electricalins4602 Is it true that the neutral doesnt count as a current carrying conductor if its a balanced shared neutral?

[@craigmichaud-electricalins4602]

@@86aoshi I have never heard that. In any type of fault or change in the system can throw it out of whack. In the NEC it calls for all current carrying conductors. That is how I have always seen it. If you find anything that is different please email so I can read about the process. Thanks for the question!! CM

[@86aoshi]

@@craigmichaud-electricalins4602 Check out 310.15(B)(5)

[@kevinmccorkle7476]

Great info. Please don't stand in front of your board, makes it a bit tougher.

[@dja711]

Thank you for the video I have a job site situation. I have 9 circuits (general use receptacles) to run in a 1 inch EMT. So 18 current carrying conductors. number 12 thhn. So 50 percent adjustment on 30 amp wire. Is that ok on a 20 amp breaker. Thank you.

[@jorgeescutia9578]

Does the 40% wire fill matter if ur de rating instead?

[@craigmichaud-electricalins4602]

@@jorgeescutia9578 yes it does!! Conduit fill based on 40% is based on area where derating only refers to the safe ampacity of the conductor. CM

[@zakirullahzakir6569]

Sir, for derating you have to go to 90degree column not 75degree

[@907sno]

This might be a dumb question but is that amperage per conductor or total amount in the conduit.

[@bigripdeniro1952]

why u use 75d column and not 90dc

[@douglassanchez5604]

Big Rip Deniro I always use the 90dc I have no idea why he took the 75dc

[@dicknastee1652]

Where might you find 310.15(B) 16

[@christianhufton6445]

How do do the same thing with different size conductors

[@sethrambo2234]

Thank you

[@jamesbuie1686]

Where exzAcky would I use this application on a device or a feed or service entry??

[@craigmichaud-electricalins4602]

Thank you for your question. Derating a Conductor is a step in properly sizing the wire. It is the code version so I explain how to do it. Like I said you only use this when you have more that 3 current carrying conductors in a cable or conduit. It is not for devices but in some cases used for service feeder sizes. I hope that this answers your question!! Thanks for watching!! CM

[@borinreyes]

I'm having a little bit of issues understanding how can i apply this when it comes to conduit size ?

[@oscar27ization]

Why they say you can use ANNEX without derating??

[@Testing329]

Viva Christo Rey

[@kamilkamal9900]

I have a question please sir. When I do temperature correction for the conductor based on the type of the insulations some times we have the same insulation type in 75 column and 90 column so which column should I use when I have the same insulation rating in the two columns? Thank you.

[@918M]

75

[@oscar27ization]

Yeh but once you have derated and have your amperage total, what do u do? That’s the breaker size amperage that you will use for each circuit?

[@truthbebold4009]

Example: if you need to wire a 50 amp circuit in this scenario, you would have to adjust your wire size. So instead of #8 THWN you could select #6 which (after adjustment for 80%) has an ampacity of 52 amps.

[@oscar27ization]

@@truthbebold4009 but isn’t 50 amps x 80% = 40? At a 75 degree would be a number 10?

[@djadrian2006]

Ok im confused on how this ties in to conduit size

[@EricJames-jn4dd]

Isn’t thwn I’m the 90 degree column

[@anthonyshedd9656]

Isnt THWN rated at 70 amps for an 8 size copper wire?

[@zionlion47]

#8 copper thwn is rated for 50 amps. Nec code: table 310.15(B)(16)

[@craigmichaud-electricalins4602]

No 70 amps is in the 90 degree column. You only use it when you dont know the exact wire type. Thank you for the question!! CM

[@catonfarm9757]

Is there any time that you would count the neutral as current carrying conductor?

[@CommunityGuidelinez]

Thats a perfect example of why I don't teach my guys to call it a neutral. The technical term is "Grounded Conductor", and that should answer your question sir.

[@hhtetris3]

More simplified version

[@christopherestevez6375]

Plesse show charts

[@christopherestevez6375]

Great video

[@gregjameston3210]

Not efficient. The code keeps it safe.

[@waylontabor4725]

Thanks