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.
Thanks, very good explanation. But one question about star/delta example: overload protection devices (like mpcb) instal under contactores and sense LINE CURRENT not phase current. In this example over 44A the circuit will disconnect however the motor continuously can work up to 60A. May you please explain? Thanks
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!
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.
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?
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?
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.
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.
Because the Delta current is the full load current of the motor. When selecting the overload settings however, you must start with 57.7% of the FLA before application of 28-306 1).
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.
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.
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.
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!
What a simplest and precise explanation......
...Excellent video, I've been trying to explain this simply for my road techs...this is the BEST explanation I've found....Cheers man.
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.👍
Great class! Thank you. It helped me a lot for preparing to take my challenge exam.
Happy it helped. Thanks for watching and commenting!
Great class, very good explanation and well paused. appreciated !
Thank you for watching and commenting!
You teach so well. I'll try to support through views and likes. Thanks for making informative videos likr this. 👏😃
How amazing way to teach, Thank you.
Hi thanks for the great video. I was just wondering. Can you put just two hot wires in a three pole overload (ex. L1✓ L2✓ L3×)??
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
Thank you very much for sharing with us.
Thanks, very good explanation. But one question about star/delta example: overload protection devices (like mpcb) instal under contactores and sense LINE CURRENT not phase current. In this example over 44A the circuit will disconnect however the motor continuously can work up to 60A.
May you please explain?
Thanks
I found that. It is just about star contactor😊
Thanks
Hello Sir Thanks for your videos, found really helpful.
I need electrical codes book ?
Excellent explanation! Your explanation is clearer than my future JK hehe nice video.
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!
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.
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?
Can you suggest some sources me to learn basic of these terms
@schulerruler Hi. In case of Y/delta motor, the overload relay will be installed after the main contactor?
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
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?
Thanks , please mention the reference of this data
How to calculate the main circuit breaker for this four branch Motors?
Check out my other video that does exactly that!
ua-cam.com/video/Z6scKF_sH8s/v-deo.html
Why Y/ ∆ start using phase current , while other motor using line current ( FLA )???
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.
Hi , I like your video. Thanks
Thanks for watching!
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.
excellent.thank you
Thank you for watching and commenting!
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.
motor will run in star (Y) current only but why ur selecting over load relay for delta connection
Because the Delta current is the full load current of the motor. When selecting the overload settings however, you must start with 57.7% of the FLA before application of 28-306 1).
Sir, good day, I need VFD inverter parameter setting, please halp me,
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?
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.
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!
AMAZING BOARD!
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.
22kw motor selection of thermal overload relay range
BRAVISSIMO!
think you
good class
Thank you! And thanks for watching.
thank you
👌
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.
Hii