Calculating Motor Overloads
Vložit
- čas přidán 14. 02. 2019
- This video walks through the steps to calculate the maximum overload setting for an individual motor using the 2015 Canadian Electrical Code. This is not an installation guide, and local inspection authorities should always be consulted.
Feel like buying Chris a coffee? Think of it as SchulerRuler fueler!
www.buymeacoffee.com/cscasconW
Over ten years in the industry and your video just cleared many unanswered questions. I like your method of explaining. thank you.
Thank you for the encouraging words!
Same here, my boss tried to explain,, but just learned in 5 minutes here👍
I'm happy it helped!
Appreciate the refresh. All journeymen/women should take some time to review their knowledge base. The field is so diverse and its easy to get stuck doing the same things for a while, which leads to important aspects being forgotten.
Congrats on the channel.
Couldn't agree more. Thanks for watching and commenting!
...Excellent video, I've been trying to explain this simply for my road techs...this is the BEST explanation I've found....Cheers man.
How amazing way to teach, Thank you.
Great class, very good explanation and well paused. appreciated !
Thank you for watching and commenting!
Great class! Thank you. It helped me a lot for preparing to take my challenge exam.
Happy it helped. Thanks for watching and commenting!
I don’t know where will I need this info but you are a good teacher sir 😀
This was SO helpful for the program I am doing! Thanks for the great class!
Happy it helped! Thanks for watching.
Yeah right. Thanks for making video like this. The details and the information are so clear.👍
You teach so well. I'll try to support through views and likes. Thanks for making informative videos likr this. 👏😃
You are the man! Love all the videos!
Haha thank you for the support!
Great vid. Can u explain difference between HOT state and COLD state of a thermal overload relay, thanx
AMAZING BOARD!
Excellent explanation! Your explanation is clearer than my future JK hehe nice video.
BRAVISSIMO!
@schulerruler Hi. In case of Y/delta motor, the overload relay will be installed after the main contactor?
If I have A 30 HP, 600 V, 3 Phase squirrel cage motor feed from autotransformer and is controlled by a Star-Delta starter. What is the maximum size inverse time circuit breaker allowed to protect the circuit.
Is it based on phase current like the above video showing?
Hi , I like your video. Thanks
Thanks for watching!
excellent.thank you
Thank you for watching and commenting!
Hello Sir Thanks for your videos, found really helpful.
I need electrical codes book ?
think you
thank you
Thanks , please mention the reference of this data
Can you suggest some sources me to learn basic of these terms
Studying to challenge my third block and these videos are so helpful. If you have any tips for third year code, I would be beyond grateful. Thanks for doing these!
Is CEC table D16 used for sizing CB?
you should do welders section 42 calculations in there
wait, how the hell can you write backwards so flawlessly
It is a mirror tool by any editing program
good class
Thank you! And thanks for watching.
I'm trying to calculate an ISO or German motor with a cosine of 0,95 ~ My understanding is that "european" motors are basically at factors of 1 on down to 0.85 or so which isn't very efficient. So if the motorplate says AMPS at 3.4 ~ with a cosin of 0.95 I would set my overload "at basically" 3.4 Amps IS THIS CORRECT?
Why Y/ ∆ start using phase current , while other motor using line current ( FLA )???
How to calculate the main circuit breaker for this four branch Motors?
Check out my other video that does exactly that!
czcams.com/video/Z6scKF_sH8s/video.html
Also, where's your grounding/bonding video. ?
That's a looooong story. As code has changed on the connection of the grounding conductor, I will be filming a similar video reflecting new code soon. Thanks for the interest.
22kw motor selection of thermal overload relay range
I HAVE A SINGLE PHASE MOTOR 1,5KW,9,5A MAX,WHAT SIZE OVERLOAD?
Check your service factor. If it is more than 115%, your overload is permitted to be rated at not more than 125% of 9.5A.
If service factor is unmarked, or 115% or less, then it is not to exceed 9.5A x 1.15.
How should I compute the min overload settings then?
Minimum would be equal to the FLA of the motor, but you would likely see a lot of nuisance tripping setting it that low.
May I know what the 0.577 is?
It correlates to the 57.7% that the phase current is in relation to the line current. As the overloads only see the phase current we must use 57.7% of line current to size them or the motor could significantly overdraw in an overload condition.
👌
How can you write backwards so impressively fast?
I wish I could say I'm just that good! I am writing normally, but the camera inverts the image 180°. Magic ruined haha.
Shouldnt your 26 A motor have FLA x 1.15 if your s.f. is less than 1.15? Not 1.25
The service factor written under the 26A FLA motor is 1.3 which would permit the overloads to have a maximum to seeing of 26 x 1.25.
Why you not use RLA for calculate?
Because calculations are based on the motor operating at full load. Anything less would undersize components and conductors once more runs at full load capacity.
@@schulerruler Thank you. One more, for a compressor, what we should use RLA or FLA?
What kind of board is this?
It's called a light board. Essentially a pane of tempered glass with LED strips around the outside pointing in. It really makes fluorescent dry erase and chalk marker colours pop on the board.
@@schulerruler It looks amazing and so easy to read! Great work :)
@@MsAmitis I wish I could take credit for the build but that goes to an amazing tech Dept!
Hii
Please Check your volume output its too low..
Why wouldn't he finish😳
Finish what, sorry?
I was believing you would finish with the breaker size
Overcurrent sizing is done in a separate video, to keep things one step at a time for simplicity. The overcurrent would be a completely separate calculation that does not require sizing of the conductor. I'm happy to help clarify any confusion, thanks for watching.