CONDUIT FILL EXAMPLES for the Modern Electrician - How Many Conductors Can I Put In...
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- เผยแพร่เมื่อ 3 พ.ย. 2019
- This video is packed with useful information on how to calculate examples of conduit fill using the National Electrical Code as the basis. If you've struggled understanding conduit fill, this should do the trick.
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Many electricians struggle with understanding how many conductors they're supposed to put in a raceway. If you haven't had a formal education over how to do this, or did not have a good teacher this may be something you struggle with often.
There are 4 different tables that you need to familiarize yourself with in the National Electrical Code. These are:
Chapter 9 Table 1
Chapter 9 Table 4
Chapter 9 Table 5
Annex C Table C.1
Chapter 9 Table 1 is a good place to start as the notes under the tables tell you exactly how to deal with conductors of various types and situations. In this video I go over conduit fill for different sized conductors, same sized conductors, and nipples - when dealing with THHN conductors and EMT (electrical metallic tubing).
#conduitfill #conductors #electrical
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I’m a Journeyman Electrician & I haven’t been in the books in over 4 years…I’m going for my Masters.
Your video is the best one I saw so far!! Very well put together and I like how you show where to go.
Thank you for the video
It starting to come back to me:)
I've been watching your videos for about 6months now and really liking them a lot, I specially love your code section. Learned a lot. Thank you.
This made a lot more sense seeing the highlighted sections and tabs in both your codebook and your ugly's. Im soon to be a fourth year and haven't had a full on immersion into the way to effectively tab a code book let alone an ugly's. If you have time, could you either link a previous video or potentially create something informative, using examples like the brilliant ones in this video, to illustrate where and what to highlight. The stuff we use all the time, maybe a penultimate "the final test" video, or just something to help us highlight and label our books. Did I see that you have the tables tabbed on the top edge as opposed to clumped in and lost among the other articles. That's BRILLIANT! Super helpful to see something like that, as many code tabs instruct us to put them all on the one mail edge. I love the outside the box creativity. It's inspiring.
I literally just took a test on this Monday lol It was a third year Apprentice test but they moved it to second year. I appreciate the additional clarification!
Great video Dustin! Thanks for taking time to teach us this stuff... I learn more from you then I do it trade school haha
Good job man, you’re good at explaining
Great vid....with helpful info. Liking these quick short vids touching on the “main” points of each subject etc.....& then on some you delve a little deeper👍🏻
Any new apprentice or helper I get, I tell them about your channel, & that you have some great vids etc....that they can watch & enjoy. Very useful for anyone at any stage in their carrier.
Have enjoyed the “podcast” type vids w/ the different ppl you’ve “interviewed/talked with” recently. Like that can put vid on & listen while I work👍🏻 Loved the stories & life experience from the last one a lot😊 (hope keep up w/ normal vids & throw those in couple times a month).
Cheers✌🏼
What a fantastic video, thank you so much! Very timely indeed as I'm running wires to my workshop about 140' away from my switchboard. Wasn't sure if I could get 4 x 4AWG wires in a 1" conduit, but yes I can.
Excellent video. Highly informative. Can't praise it enough. Great job in explaining how conduit fill works. I've been dreading learning it and you made it incredibly simple. Thanks.
I'm listening because you're teaching me. Thank you.
Great explanation, better than many teachers I know. You are a good communicator.
I've learned a great of information in this video. Keep up the good work man and thank you so much for this awesome video.
Awesome breakdown of information for newbs. I love the full breakdown of calculations.
Love the information in here, quick and simple. Great tip on the Ugly’s
Very nice explanations !. You're now in my `FAVORITES'. Thankx
Thank you for these videos a lot of the ones getting me through the industrial side are people with accents I can’t understand outside of the states and your content is clear and you use common language again thanks man
Excellent information! Thank you!
You explain it way better then my instructor. Thank you austin, u have help me out alot 👍🏻
Bro I really like your videos, Everytime I need to know something new For the new type of job I’m doing it’s everything related to low-voltage.
Much of your videos always come handy to me
Thank you for doing all of this and thank you for all of your time Invested here
Excellent! Good info and good camera shots and video.
Thank you. Glad you covered this, my friend.
A few points. 1) heat is a factor in raceway fill since mutual heating becomes an issue. There are Performance and Prescriptive Requirements and the prescriptive requirements that demand the maximum fill are to also help satisfy the performance requirements so as to not damage the thermal properties of the insulation. 2) Yes, another key factor is indeed reducing the potential for damage during the installation. Remember, that Informative Annex C is only for raceway fill as a short cut when ALL the conductors are the same size, it doesn't reference heat simply because it is again simply giving users as a shortcut method to maximum fill if all the rules are adhered to. Back to heating, just because the values of 310.15(B)(2)(a) and 310.15(B)(3)(a) appear to have no relationship to raceway fill they do when ampacity is involved and the perfect world of 310.15(B)(16), such as more than 3 current-carrying conductors are encountered. The annular space that is also maintained helps to allow heat dissipation, not removal. Just some thoughts to share. Now, if the heat was not involved AT ALL then why do you think nipples allow fill allowances to he up to 60%, it is due to the limited length and availability of enhanced heat dissipation. Clearly, the reduced nipple length is not an installation damage concern during the installation. Point is they all work together in a Performance and Prescriptive method by using all areas of the NEC.
Master The NEC I’m not disagreeing with any of that, I’m saying that is the reason we use temperature and correction factors for sizing the conductors, not for sizing conduit. And nipples have 2 benefits according to Ch 9 Tbl 1 - no derating for ambient or bundling because of this heat dissipation you talk about and 2 adding more conductors because of physical damage being a lot less likely. The heat and the size are two different things. My argument is that sizing raceways doesn’t require knowledge of heat dissipation, only size of conductors. Head dissipation is dealt with when sizing conductors.
I can agree if sizing is your only goal physically and based on the title of the video that was your goal. However, I felt it was important historically to understanding WHY we size and how it still linked to the thermal effects of sizing. Ultimatly we could care shitless about size except it links us to the detriment of the wire and its ability to safely and efficiently carry current. The dog wags the tail....We worry about raceway sizes with the knowledge that it helps achieve a performance goal of not damaging the conductors. They work in harmony. Now, if the only goal was to size in the video then no worries but saying heat and mutual heating plays no historical linkage is inaccurate in my opinion. But, Yes I conceded that of sizing is your only focus of the lesson then goal achieved. Hopefully, you did mention Annex C only applies to 40% fill and if all the conductors are the same insulation type and size but I am sure you did my friend.
Electrician U Dustin, So after all of that, follow what you showed in your video and all is good!
My points were not to criticize Dustin. It was to elaborate on some points. The core raceway fill components are spot on and Dustin knows I would never do that.
Master The NEC thanks for sharing, again I do believe mutual hearing and energy dissipation are indeed things that happen. What I don’t believe is that the 40% fill was created for heat dissipation. I believe 310 was created for heat dissipation, ch9 was created for fitting conductors in conduit. That’s actually ALL I’m saying.
I always had problems with this. For some reason it never made sense to me. I'm very glad you covered it. Thank you I love your channel
Nearly first, next time. Love the videos man, inspiration for an apprentice starting the trade
Ollie Wilkes agreed
great video man , thank you!
I’ve watched a few of your videos & stumbled on this one. I don’t do a lot of electrical anymore but I’m building a large shed for my woodworking equipment. This conduit episode is perfect as I need to run about 100’ of 1/0 Thhn Thwn 2 for a sub panel.Also thanks for the ugly’s book have one on order.
I also just subscribed as I believe you channel is awesome.
Great video. I took your advice for the Ugly's book app and find it very useful. thank you for that.
I just like man!! I love having you as my electrical teacher . Keep up the good work!!
BEST approach to tech topic EVER! Bravo and thanks fir great info.
Thanks bro! I really like how you reference the code. And yes the notes are good and leave the crumb trail of where to look next.
This is great info and have had to use this plenty of times but is only good for maybe control wire. I don't get this chart because of the derating factor chart. See if your inspector passes you with 16 #12 in a 3/4" emt for branch circuits. Also i think the derating chart should be for continuous loads . Or at least some type of residential exemption.
NO ONE SAID THERE WOULD BE MATH!!!
Great stuff. Thanks for sharing.
Not only math, but ALGEBRA!!! Oh, the horrors! 😆
Dustin, Very good video! A couple finer points. The conductor areas listed in the tables are information based on Southwire. Exception allows you to use manufacturers information for specific conductors. Also, somewhere in the back it says that at 40.5% you can round down. I'm sure you can guess how I found this out after designing electrical for 35 years. I needed both to be legal. Very respectfully, Kevin
Absolutely brilliant! Thank you!
2nd yr apprentice here , You should make a video of what you tab out on your uglys book, like to point out the info that you use the most. 👌🏽 love the channel.
Thanks for covering the topic.
Nice work. You are a good teacher, and this video is clear and super useful.
As a professional electrical engineer I found this video helpful. I've taken my fair share of academic courses and certifications and there is so much information to remember its insane. I have to do fill and bend radius calculations on a daily basis so i tend to forget some of the other useful pieces of code in the NEC.
You guys really need some on the field training for sure. All the new engineers we deal with just don't get that, hey I can't mount a can light light on a solid steel stud or what I'm saying is learn how stuff gets ran and what Electricians have to deal with. It'll help us lots for sure. And other way around
Hey man! EE here who has to know the trade and code rules. What's your field?
Please check your code book. If you read the informational notes of Annex C in the NEC Handbook it leads you 300.17, which clearly reads... "the number and size of conductors in any raceway shall not be more than will permit dissipation of the heat and ready installation or withdrawal of the conductors without damage to the conductors or their insulation".
Enjoying the info! Having a hard time learning and reading everything online due to the pandemic but you make it easy and straight to the point! Thanks
Very informative. Exactly why I leave almost all electrical to the pros.
If it could exist a video like yours for canadian code I would be so happy ! Good video btw
Conduit fill CAN lead to too much heat. Heat can cause a "You name it" list of problems in electrical systems. I have seen it personally on more than one occasion. Remember, 9 current carrying conductors or less to avoid derating the conductor amperage heavily.
That's not conduit fill, that's adjustment for multiple current carting conductors in a raceway
@@jontopham2742 Read Article 300.17. In the NEC Handbook, both chapter 9 and annex C refers you to that article.
@@jontopham2742 conduit fill is almost useless because of derating, besides 60% fill on nipples with no derating
Thanks bro, I really enjoyed your videos.
Awesome video! This makes so much more sense then how they teach it in trade school.
Great video, thanks for taking the time to produce these video's and making them so easy to understand.
Non-electrician here, but watching the channel to START my education because I plan to re-wire my house in a few years. Looking in my basement, I see a few tubes of 1/2' NMT filled with Romex along the walls. Some have one, others have two. Is Romex, when still fully sheathed, considered one conductor or still considered multiple? In either case, I feel these conduits are overfilled.
What you said at the start of the video is true. Derating for conduit fill is a whole other conversation.
I think the other reasoning behind it is that conductors expand/contract depending on ambient temperature (especially in unconditioned spaces, or if buried).
If conduit was crammed full during the winter for example, and all the conductors expand during the summer, it's possible they could get damaged somehow.
But yeah biggest one is probably just for sake of pulling conduit and the jacket not getting destroyed.
Actually you just touched on an issue that Los Angeles had years ago with the wires rubbing on the conduit as they heat and cool with load and season. In that situation it was something like 200,000KV not residential but same general principal applies.
great video, and that is an awesome knife switch on the back wall.
Please more content like this, actually showing how to read the tables and apply them.
This is a really good video. I’m a 2nd year apprentice. My supervisor and I were just talking about conduit fill these last two weeks in the field. Today in my apprenticeship class we talked about conduit fill and today you uploaded this video. Always nice hearing it from multiple perspectives. I always feel it helps to ask while in the field and then do my own research on the question when I get home. It helps me retain the information and be able to apply it on the job. Thanks for another great video.
Great video 🤘🏻
Thank you !!
Man your f;/(ing AWESOME. Keep up the good information it’s really appreciated by someone like myself
Thanks I appreciate it 👍😎
Thanks for the videos very helpful would you do conductor box fill please .
You are a wizard this is super helpful!
Extremely important to know and always make sure u dont over fill
your very good young man, explaining in details the chapter 9
Thank u for the information and help...
You are a life saver my friend
Thank you, you explained a ton
Thank you 👍
Is a neutral wire and or ground considered a conductor as far as conduct fill is concerned?
I was wondering if Neutral and Ground are included in the Conduit Fill calculation as well...?
I would give this 1000 thumbs up if I could.. Best explanation out there. Thank you!
i am completing the design for the full electrical remodeling of the warehouse.
i've devised the calculator for the conduit fill check.
dustin, if yopu are interested, let me know.
the program is fast and accurate, and the data is taken from the "uglly's".
thanks for the video and for your channel.
toly
Great video , I have a question
What size conduit for 12-2 wire
What size conduit for 10-3 wire ,and should the jacket be stripped off ? Thanks for your time
Thanks for you help.
I'm curious about the different variations for conduit types in Annex C, why is there a C11 and C11A and how do you know which table to use in what situation?
I am studying for my PE Power exam and this is so helpful. Thanks
Thank you teacher
My man! I wish you were my professor! haha He is alright, but I learn so much better from your method of explaining! Thanks!
lov you it think..........good videos man
Very clear explanation
I love that he have a chart with him. Wise man! Thank you for this!
Thanks!!!
thanks for the information well explain thanks
What’s a good source for getting a set of those trade journals or a book on the national electric code?
Lol, I just got the AGLY'S book like 5 hours ago, I thought it was the right time cause I am almost finish with WIRING SIMPLIFIED book (I like that one too), happy to know that according with you i did good getting this book, is there another book you think I should read next?
do you have a video on conductor ampacity correction?
Great job on videos
Thank you.
I looked for a video of your on conduit bodies and the fill limits on them, but didn't find one. Interested mostly in PVC LBs.
Honestly, the internet is scaring me. I'm looking toward relocating (or having it done) my main panel and meter and upgrading from the currently existing two panels (one in the main house and one in the semi-detached former two car garage/previous owner's workshop) to those two plus three more panels: one in the "pool house", one in the tool shed/workshop, and one in the "barn." I was thinking about duct banks and what size conduit I'd need to run the feeds underground for all three panels (since the closest is about 100 feet, the next one at about 125 and the third at about 185 feet). I mean, I thought it, and whoa, here's a video talking about it. scary.
In Canada you have to de rate the amps for wire sizing based on how many conductors in a pipe. So I guess in Canada they include heat as reason for conduit fill. I.E if 7 conduits in a pipe you got to use a 10g for 20a pull. (Not exact just an example)
Are Neutral and Ground included in the Conduit Fill calculation as well?
Kind of in the weeds a bit more, but when filling conduit with multiple branch circuits, do you try to even out which line (120/240 split phase) the branch circuits are supplied by, if running hot and neutrals in separate conduits?
Ex: 8 conductors, 4 branch circuits, if all on line 1 supply, would increase mutual inductance in both the conductors and any EMT/Liquidtight metallic. This would increase your eddy currents, reducing your ampacity margin, right? Or is this just not a big enough impact to consider?
Good video BUT the NEC will argue with you about derating of conductors and the AHJ may make you change them if not factored correctly. Derating the size has to be applied when running more than 3 current carrying conductors in a conduit. This is why is makes more sense to run smaller conduits like 3/4" with less conductors because it's not economical to upsize the wire when you fill a larger conduit with more conductors & the wire size needs to be increased due to derating. This is one subject that is always argued upon in the field. Wish the NEC would clear it up better. Other factors to consider are ambient temps say in a boiler room that has temps above 86 deg F. Also the termination lug rating of equipment can dictate what rating of wire amp table you can apply. Say your breaker lug has a rating of 75 c you can't use the 90c amperage table for wire size. I advise Apprentices to dig a bit deeper & check several opinions from TH-cam & Google for you answers. On another thought the factories I've worked in over the years have plenty conduits overfilled with general purpose branch circuits, not that it's right but they operate fine. You really need to be careful when running heavy amperage circuits like motor loads ect in the same conduit. I don't claim to be an expert but have 40+ years experience.
This is true. I’m a journeyman in Dallas and do industrial and commercial and inspectors are actively asking about de rating and checking out conduits with more than 3 current carrying conductors and making sure we upsized accordingly. They don’t always check but I always de rate all of my conductors just in case. Usually this leads to multiple small conduits being ran as opposed to less amounts of bigger conduits because we avoid upsizing the wires to much because of the original bid cost
What area is used when running romex in a conduit?
Ty, lifesaver
Hey boss man i came across your videos a few weeks ago and im really excited about starting out in learning this trade . Im 32 married with three children , iv always done blue collar work my whole life, such a- yard care -tree care -a little bit of remodeling-alot of painting -and framing new construction, any way i never graduated or got a GED , but i feel like the electrician trade would be a good fit for me and my body , i was in a very bad vehicle wreck three years ago. I broke my back and neck , some ribs and my left collarbone, im back at well 85% i feal like your a strait shooter , id like to hear your thoughts on starting my apprenticeship for the electrician trade, and would anyone even look my way to train me , would love to hear from ya brother , no sugar coating on your opinion 👊.
GarretJacks Green lights Gaming
I am a one year apprentice at 30 years old. Also we have a guy working with us who has no experience 45 years old three kids and work nights at his second job moving furniture but after 25 he said he needed a career.
In five years if you start today you’ll be a journeyman and have your license before 40.
I pulled a “career change” last year at 40yrs old. Don’t let them get you down. Get that apprenticeship, make those grades, learn those skills. Earn that pay.⚡️🤘⚡️
This was gold
Hey refresh my memory of what does t hhn stand for
where can i get these books like the one you have? thanks man.
Hello man, greetings. What book do you recommend for the electrical master's business exam?
Great video
Great information. I’m curious I just got a 2 in conduit for a sub panel feed and I noticed the knockout fits up to 1 1/2 in. So my question is can I use an adapter that fits the KO that would still accommodate a 2 in conduit. I appreciate any advice 😎👍
You need a knockout kit. That's the easiest thing in the long run
You need a Knockout kit (there is a hand pump one that is oil filled or Milwaukee makes a battery powered one but if you are just doing this one time (hopefully you have more experience if you are running conduit to your sub panel) get a Hole Saw that will fit a 2" conduit, I believe it's at least 2 1/4" or 2 3/8" size hole saw (as you need a hole saw big enough for the outside diameter of the pipe) so it has to be bigger than 2"....
How would you install ultratite liquidtight flexible non-metallic pvc conduit onto cables already in place?
Were do you buy the code book?