Motor Bank Overcurrent Protection
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- čas přidán 14. 02. 2019
- This video walks through the steps to calculate the maximum overcurrent setting for a motor bank using the 2015 Canadian Electrical Code. This is not an installation guide, and local inspection authorities should always be consulted.
This is the kind of explanation I need, no segways, no bullshits, and no unnecessary or irrelevant topic added, just go straight to the point. Thanks for this!
Doing my level 3 at BCIT right now and these videos are a great resource. The way you have staged them with the neon markers is terrific, we can see you explain it and we can see your diagrams, very well laid out. We are all taking the class from home thanks to COVID-19 craziness so these are really a godsend.
Thank you for the encouragement!
Make sure code rules all align as this is 2015 code, but calculation methods are the same! Good luck!
Hope you continue to upload Technical videos like this. You got my back.
You are exactly what you ordered...Thanks Doctor
thanks for watching and commenting!
Dear Sir i m really impressed by the way you are teaching .can you please make a video on over current and time setting for the motor also .
Thank you for that lesson, very easy to understand
thanks for watching and commenting!
Great content. I’m getting ready to write my IP in 3 weeks and your videos are helping me with motor banks!
Would you happen to have any other material you’d recommend to help with the IP?
Thanks!
Perfect. Thx.
super helpful thank u
Thabk you Sir for sharing your knowledge.
Thank you for the kind words!
omg, You are Amazing, this is exactly the vidoe I need today.
Thank you for this video
Thank YOU for watching!
hello, thank you very much for this video, it's help me a lot.
Does the method change when you want to size the service overcurrent protection when you have multiple motors and also other load such lights, dryer, etc...
thank you
Hello. Great videos! Looking at rule 28-206 for grouping, I was always under the impression that you calculate each individual motor with the percentages from T29 for the overcurrent that supplies them, and then at the end multiply the largest number by the feeder overcurrent percentage from T29 plus all the FLA of the rest of the motors. I'm not understanding why you would use the 250% on the non-time delay and time delay when T29 says otherwise. The 2018 illustrated code series book does it this way.
Great material and very helpful, nice work! Not sure if you know or not but M4 you found a multiplying factor of 200%, where would you find this in the NEC version or is this one of the differences between the CEC and NEC? Im not finding %'s on FVS and ATS anywhere in the 430 section of the NEC. Any help would be appreciated!
Thanks
@schulerruler how do we size the feeder breaker if one of the motors was controlled through a VFD?
what do you do if one of the motors has a secondary current with continuous res duty?
Hey man, thanks for your great channel. Can you please tell me what Hermetic Equipment is?
Amazing explanation.
One question, how about calculating the feeder supplying the motor bank ?
Thanks for watching. This video should answer your question!
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Thanks for the great content!
How can one tell if we're dealing with a feeder rather than multiple motors on a branch circuit? (28.204 vs 28-206)
also, can't 28-204 4) be interpreted as saying we can size this overcurrent up to 300A? There's a bunch of conditional language that makes it hard to understand but that's how i read it. Is it rather that the demand factor mentioned in 28-108 3) is specifically about "load factor"s, rather than any other demand factor we apply?
Hello I am from the Philippines. I have a question. Is there any provision in your electrical code regarding the circuit breaker size for a motor with soft starter? Thanks .
REFERENCE BOOKS RELATED TO SIZING OF SPARES TO CONTROL PANELS & IN& OUT CABLES
nice class
thanks for watching and commenting!
Excellent explanation well done. But I could not find schedule number 28-204 in NEC .thanks
This is a reference to Canadian electrical code. I am unfamiliar with the reference to the NEC that would correspond unfortunately.
@@schulerruler thanks for your answer. I must download canadian electrical code
How about if the motor has a wye deltà magnetic starter. What is percentage of the motor fla to get the motor cb?
For the breaker itself you would still reference table 29 and use the FLA of the motor. The table will have it listed as star delta as opposed to wye Delta but the max should be 200%.
You do also need to ensure the overloads are sized in accordance with the percentage of current they see, for a wye Delta start it should be 57.7% less to size the overloads, in conjunction with the proper multiplier from 28-306.
Is the multiplying factor the same (2.5) for a single phase 110v cont. duty FVS motor?
Referencing table 29 in the CEC, yes it is if it is a breaker. 300% for a non time delay, and 175% for a time delay.
@@schulerruler Thank you! Very good lessons!
I WANT SIMILAR DETAIL TO DOL, STAR& DELTA ATS & RRS FOR CONTINUOUS RATING.
wouldn't 261 Amps give a breaker of 300 from table 13?
Read rule 28-204 1), it states "not more than", which would been selecting an overcurrent not more than the calculated value.
Is this Canadian code?
It is eh.