Clearer is impossible. Great way, very nice material and resources for teaching the best way ever. Thanks Mr. Ryan Jackson. You do a great deal for electric world and safety.
If you put 40A on a "40A" breaker, it shouldn't open _immediately,_ but because every breaker I've ever seen is derated, it will eventually pop.(30min, or 2.5hrs... it will vary with age and environment.)
Is the point of an inverse timing curve that some loads will have temporary spikes in their current usage? so for example you don't want to instantly trip the breaker if there is a transient 60 amp spike on a 40 amp circuit, say from a motor
A bimetallic strip is not a piece of metal that's an alloy it is too dissimilar metals that have different expansion characteristics in heat causing them to bend or Warp as they are heated or cooled
How does this come in to play with the "continuous" load of 3 hours or more in which a breaker is not expected to carry more than 80% of it's rating vs the "non-continuous" rating of less than 3 hours in which a breaker is allowed to be loaded to 100% of it's rating?
If a breaker is not specifically rated for continuous duty, then the breaker has to be sized to 125% of the continuous load. Or 125% the continuous load + 100% non-continuous load if it carries a mix of both types of loads. If a breaker is specifically rated for continuous duty, then it is rated for carrying 100% of its full trip rating continuously, and the 125% factor doesn't need to apply.
Call me old school but was taught to never load up any circuit breaker by 80%. If we had a fixed lightning load of 12 amps would always use a 20 amp breaker. At the large hospital that I retired from they never put more the 3 duplex receptacles on a 20 amo breaker but during yearly IR scans the 1 or 2 bolt on single pole breakers that were a few degrees warmer then the rest were loads around 90% of breaker. ( 18 amps on a 20 amp breaker ). Would check the bolt on & wire terminal for proper torque and they were never loose.
@@RyanJacksonElectrical Hi Ryan. We just got some patents on highly disruptive panel and circuit breaker tech. The panel is microprocessor controlled and we've replaced dumb mechanical circuit breakers wit smart solid state modules. Here's a short clip. th-cam.com/video/DtmYrKVzfnI/w-d-xo.html The patents are US 10,862,277 and US 10,887,964. Check it out.
@4:05 40 amp bkr 135% indefinitely, but in your xfmr video you have 135% 1 hour for 50 amps or less. Gotcha! BTW 1701 apprentices like you better than Mike...haha
Clearer is impossible. Great way, very nice material and resources for teaching the best way ever. Thanks Mr. Ryan Jackson. You do a great deal for electric world and safety.
Thanks so much Felix, you are too kind.
Again, thank you for sharing this info with us, I am learning a lot watching your videos
Excellent description, thanks...
Awesome work Ryan...!!! I see you far surpassing that other electrical guy on TH-cam just saying...!! 🔥🔥🤘💯✅
Awesome Video! This helped me understand breakers better. Thank you.
If you put 40A on a "40A" breaker, it shouldn't open _immediately,_ but because every breaker I've ever seen is derated, it will eventually pop.(30min, or 2.5hrs... it will vary with age and environment.)
There is a time-current curve, to make it trip sooner, the greater the degree of overcurrent.
Thanks for making this great content Ryan! Did you ever get a chance to make the adjustable circuit breaker video?
Not yet, sorry.
Is the point of an inverse timing curve that some loads will have temporary spikes in their current usage? so for example you don't want to instantly trip the breaker if there is a transient 60 amp spike on a 40 amp circuit, say from a motor
Exactly.
A bimetallic strip is not a piece of metal that's an alloy it is too dissimilar metals that have different expansion characteristics in heat causing them to bend or Warp as they are heated or cooled
Agreed, poor choice of words by me.
How does this come in to play with the "continuous" load of 3 hours or more in which a breaker is not expected to carry more than 80% of it's rating vs the "non-continuous" rating of less than 3 hours in which a breaker is allowed to be loaded to 100% of it's rating?
If a breaker is rated for continuous duty it can use 100 percent of its rating forever.
Don’t forget you calculated at 125%
If a breaker is not specifically rated for continuous duty, then the breaker has to be sized to 125% of the continuous load. Or 125% the continuous load + 100% non-continuous load if it carries a mix of both types of loads.
If a breaker is specifically rated for continuous duty, then it is rated for carrying 100% of its full trip rating continuously, and the 125% factor doesn't need to apply.
Call me old school but was taught to never load up any circuit breaker by 80%. If we had a fixed lightning load of 12 amps would always use a 20 amp breaker. At the large hospital that I retired from they never put more the 3 duplex receptacles on a 20 amo breaker but during yearly IR scans the 1 or 2 bolt on single pole breakers that were a few degrees warmer then the rest were loads around 90% of breaker. ( 18 amps on a 20 amp breaker ). Would check the bolt on & wire terminal for proper torque and they were never loose.
Just for continuous loads.
@@RyanJacksonElectrical Hi Ryan. We just got some patents on highly disruptive panel and circuit breaker tech. The panel is microprocessor controlled and we've replaced dumb mechanical circuit breakers wit smart solid state modules. Here's a short clip. th-cam.com/video/DtmYrKVzfnI/w-d-xo.html The patents are US 10,862,277 and US 10,887,964. Check it out.
Love the details
Please make a vedio on padlocks sir
I will put that on my list.
This video helped alot thank you.
@4:05 40 amp bkr 135% indefinitely, but in your xfmr video you have 135% 1 hour for 50 amps or less. Gotcha! BTW 1701 apprentices like you better than Mike...haha
Thanks!
🍺🥃🙂👍🏻