EGC for Parallel Conductors, Sizing [250.122(F), 2020 NEC]
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- Опубликовано: 2 окт 2024
- 250.122(F) EGC for Parallel Conductors, Sizing - www.MikeHolt.c.... One of the costliest mistakes made in electrical installations is a failure to read and fully understand the Code rules for sizing and installing the EGC when paralleling conductors. Read your Code book while viewing this video and you could wind up saving yourself a huge amount of aggravation and money!
This video is extracted from Mike Holt's 2020 Bonding and Grounding Textbook and DVD program, for more information visit www.MikeHolt.c... or call 888.632.2633.
For over 40 years, Mike Holt Enterprises has been providing quality electrical code training to help electrical professionals learn the code, prepare for exams, and improve their electrical knowledge. Visit www.MikeHolt.com for exam preparation tips and training, instructor and curriculum support, continuing education options, free videos and graphics, and so much more.
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I love this video.
I generally use table 8 charter 9 to calculate the impedance of a conductor according to the lenth of the conductors.
Thanks, I followed you to find the right chapter/table8
Awesome video. Could do without the thank you
do a video on parallel feeders on 1 conduit vs 2 conduits
I'll do that in my new book "Understanding 2023 NEC Calculations."
Mike I watched a few hours of your 2023 recording livestream, I wish I would’ve taken the week off work to watch it fully haha 😅
The videos (digital and DVD) are available now! Call 352.360.2620
Great to see some MH vids again
Mike I have a question. Do we need to apply the LCL factor when we size conductors on the DC side of the cabinet/dispenser branch circuit like we do on the AC side between the point of connection and the EV charging cabinet? Thank you. Ben
I don't know what a LCL factor is and the NEC has the rules on how to size conductors for PV systems in Article 690.
awesome video
Great video...ty
in your illustration at 6:05 timestamp, where # 3AWG is used as the EGC, wouldnt that violate 310.10 (G) (1) where it states you must used 1/0 or larger? or does this not include EGC's?
Please review 310.10(G)(1) again, it specifies "each ungrounded conductor, grounded conductor, or neutral conductors," not the EGC. See 310.10(G)(5) Where parallel equipment grounding conductors are used, they shall be sized in accordance with 250.122.
@@MikeHoltNEC Just found a Info note in 2020 stating Equipment grounding conductors are not grounded conductors. I was going back and forth in my mind about whether an EGC is a grounded conductor or not. Thank you for the reply!
@@Rdmanelect Yes!
Ye, Joel pointed💡
Hello Mike or Scott, I have a question that was not mentioned in the video. This is in regards to EGC for parallel feeds. I have four (4) motor control centers (MCC) at 800 amps each. I am feeding these MCC with three (3) #350 kcmil cables per phase for each MCC. The 480V switchgear is 250 feet away from these MCCs. I will be routing twelve (12) #350 kcmil cables from the 480V switchgear to the four (4) MCCs in a 36 inch CABLE TRAY (no conduit).. The EGC for 800 amps is #1/0 copper. Can I install one (1) #1/0 EGC in the CABLE TRAY from the 480V switchgear to the MCCs then split it out to four (4) #1/0 and into the four (4) MCCs or do I need to install four (4) #1/0 EGC from the 480V switchgear to the MCCs inside the CABLE TRAY with the parallel feeders? Greatly Appreciated.
We did cover all of the rules that apply to your example. Please review 250.122(A), (B), (C), and (F) put them all together and you have your answer. Hint, you only need one EGC per in the cable tray [250.122(C)]. What do you think the answer is?
Awesome! Thanks again!
@@tomtran9862 you welcome
Can't you still use the conduit as an EGC in a parallel run? And not worry about the "ground" wire
Of course.
@@MikeHoltNEC I feel like this is a sarcastic “ofcourse”. There’s no way that the pipe alone can be an effective ground fault current path for a 1200A over current device … can it?
its like a comedy show
For sure it's a show and if it's at time funny, perfect.
That's a big price difference on a long run. If you have room for bending larger conductors for terminations install just one raceway and install just one equipment grounding conductor.
Assuming your conduit is large enough and can accominidate the heat capacity/derating for all wires.
3/0 copper would be expensive AF
That gets hard when you have over 1000 amps circuits