Derating of Conductors Explained
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- Опубликовано: 13 май 2018
- 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. 
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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
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!!!!
You’re a excellent teacher body your explanations your tone of voice everything I feel very easy to catch everything you’re teaching
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.
My dude craig coming with straight knowledge. Much appreciated.
My first time managing a small project, this helped me clear things up.!!! Thank you.!!
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.
I'm in my 1st yrs. 1st semester 6months in the trade. Your a great instructor. Thank you for the video's.
Very good explanation, always wondered how to derate, you just made my life easier, don’t stop making your videos👍💯
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
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
This helped me out far more than class did. Thank you so much.
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
As a brand new JW, this is awesome, thank you so much.
/// FIRE !!!! QUICK AND SIMPLE. I LOVE TO LEARN THIS WAY. THANK YOU.
thank u craig quick to the point and very clear with instruction
Thank you sir extremely good explanation, none of my teachers explainations where clear but you did it with ease! The apprentice thanks you
I really liked your video. I'm going through classes and helped me to catch up. Thank you.
Nice thank you so much is very useful. Keep the videos coming I’m subscribed.
I've been busting my brain and you made this so easy to understand take you very much
Super helpful and simple to follow. Thank you! Subscribing!
Believe it or not , I actually learned the most from you. ! As far as RUclips channels are concerned.
Appreciate the info brother!
Awesome video, very easy to understand thank you.
Great explanation. Your videos help so much with my studies. These books are confusing. Keep it up!
Thank you for making this video brother
Great breakdown
Hi Craig!!! Love your videos!!!
great explanation thanks!
Excellent explanation!
Another great video sir, thanks for the breakdown, my professor wouldn’t have the patience
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!
Good luck!! CM
Thank you for your excellent explanation.
OMFGGGGG IT MAKES SENNNNSEEE THANK YOU!
I wish you were my boss!! You seem like a nice guy, with lot's of knowledge
I enjoy what I do so I love sharing my knowledge!! Your to kind!! CM
Hello , You’re videos are bad ass !! 💯
Thank you very much!! CM
cool video, makes it easier to understand
Excellent. Thank you.
Thank you very much !!
Excellent!
Just want to give you props. Very well done. Made simple
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
Thank you so much
Thank you this was easy to understand
Always love positive feedback. Thank you for watching. CM
hell yea made sense thank u sooooo much
Heat is the Enemy. Nice Video
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.
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.
Good tutorial learned this in class today
That is awesome. Thank you for watching. CM
Thanks
Thank you
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.
You don’t have an idea how values this is for me . Now I have to do my homework on NEC . Thanks
Would you make a video about when we count neutral as a CCC and when not
so if u up the wire, the breaker size stay the same?
NEC 2021
TABLE 310.16 & 310.15 (c) (1)
This might be a dumb question but is that amperage per conductor or total amount in the conduit.
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?
any chance of updating to 2020 NEC code?
Nice
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.
How do do the same thing with different size conductors
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.
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.
@@KLAWNINETY thank you makes perfect sense
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.
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?
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
Where might you find 310.15(B) 16
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.
75
Interesting that you call it debating
The code got rid of that term and identify it as adjustment or correction. Just curious..
I'm having a little bit of issues understanding how can i apply this when it comes to conduit size ?
you're supposed to use the 90-degree column when applying adjustment of correction
Is the neutral/ grounded wire a current carrying conductor?
Yes it is! CM
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 💯. 😉
Grounded and grounding conductor are two separate things. Don’t know if you caught that.
@@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. 👍
What abuot with two diferent gauge of wire in the same pipe, what's the proces?
I don't think it matters, but you have to debate each wire accordingly.
Where exzAcky would I use this application on a device or a feed or service entry??
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
After 3 current conductors, does the neutral count as a current carrying conductor?
Yes the neutral is a current carrying conductor!! Thank you for your question!! CM
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
I will be starting back up in March!! Had some health and family issues! Thank you for subscribing!! CM
Question a current carrying cunductor also includes a neutral wire? Also thanks for yhe video
Thank you for the question!! Yes the neutral wire is considered a Current-carrying conductor. Thank you for watching my video!! CM
@@craigmichaud-electricalins4602
Is it true that the neutral doesnt count as a current carrying conductor if its a balanced shared neutral?
@@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
@@craigmichaud-electricalins4602
Check out 310.15(B)(5)
Sir, for derating you have to go to 90degree column not 75degree
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?
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.
@@truthbebold4009 but isn’t 50 amps x 80% = 40? At a 75 degree would be a number 10?
Ok im confused on how this ties in to conduit size
Why they say you can use ANNEX without derating??
Great info. Please don't stand in front of your board, makes it a bit tougher.
Isnt THWN rated at 70 amps for an 8 size copper wire?
#8 copper thwn is rated for 50 amps. Nec code: table 310.15(B)(16)
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
why u use 75d column and not 90dc
Big Rip Deniro I always use the 90dc I have no idea why he took the 75dc
Viva Christo Rey
Is there any time that you would count the neutral as current carrying conductor?
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.
Isn’t thwn I’m the 90 degree column
More simplified version
Plesse show charts
Great video
Not efficient. The code keeps it safe.
Thanks