INTERRUPTING RATING vs AMPERE RATING

[@project2star492]

Dude you are such a boss. We doing our own offgrid 3kva / 2400 watt solar setup. This was very helpful for the choosing breakers. Thanks! 💪

[@OutofTimeDateMind]

I work in electrical wholesale and I have to do learning/training modules for product knowledge, and I never had as many "oh, I get it" moments watching those modules as I do watching your videos. Thanks, Dustin for being awesome at what you do and just as awesome at explaining it.

[@elijahrector2168]

Thanks for what you do. I have overduely- neglected the books and technical side of electric for too long but now that I am wanting to get my license that’s exactly what I have to do so I’m playing catch-up.

[@Carnivorefitness2024]

Great video! As an electrician myself I love your channel brother! Great topic here, not one we are well versed on!

[@kaicho8888]

Note that the panel (components) also have to be capable in handling the short circuit fault at the panel location... SCCR (short circuit current rating). Excellent channel!

[@garbo8962]

That is why a lot of equipment come with. fuses that can only meet the high interupting currents found in builings with large transformers. I always ordered time delay fuses with a 200 KIC rating to cover all bases. Back in the 80's worked for a large company that only used fuses with renewable fuse links to save money. Think they were only for 5 or 10 KIC. Most of the equipment were feed by 3000 amp buss duct so the KIC hadcto be high. Took years for me to convert them over to a one time quality fuses with a 200 KIC rating.

[@tonyvolbeda952]

was in hvac and commercial refrigeration.. Figured the needed size of the breaker was actually 80% of toggle label at 90 degrees... Can't begin to the number of clients with panels on the afternoon sun walls that had problems with breakers tripping when the wall heated up in the summer.. fans would help on the more moderate days.. 100 degrees days were a bitch

[@dgibson6147]

Ok here's you one. I know the answer but would like to hear your side. Why do we have to pull bigger feeder wire than the electric company supplies to the home from pole. Thanks enjoy watching you. Keep up the good work

[@billmccluskey6294]

Always learning something new watching this channel. Love that you constantly refer to the electrical bible. (code book) If you don’t follow code, sooner or later you WILL get hurt or worse. !!

[@jimthannum7151]

I learn so much from you and your channel, don't I managed without it.......dumb luck I havn't electrocuted myself, better prepared is the key and that is where you come in with your clear and concisely crafted videos.

[@dracula3811]

I've come across intermittent tripping service calls where the 20a breaker was holding at 26-27a. The cause was multiple space heaters on the same circuit.

[@KevinCoop1]

Dustin, Absolutely perfectly explained! Best wishes sir! Kevin

[@tysoncrandell9726]

Hi! i just want to say that as an electrical engineer i often show your videos to engineers that need more real world examples. so thank you for that. second on your part about the kaic rating I found it very interesting that you have two different ratings on the same bus... so 22k and 10k but at least to this point i haven't heard you talk about the bus, maybe you will further in the video but one of these ratings is wrong as im sure you know.

[@donaldlee6760]

At 0:25, is that modern Zinsco replacement breaker basically as good (more specifically, as safe) as the best of what current breakers offer, not counting gfci or afci features of course?

[@Neil-ym8vy]

Nice to learn this information. Never thought to ask about this on commercial and industrial jobs I was on.

[@MrLectric]

It would've been totally cool if there was a way you could've shown a demonstration of what actually happens physically to that breaker with that particular voltage of 1000 or 10k amps as a visual..like in a controlled environment of course on a test bench..keep up the awesome work tho..loving the content bro!!..💪🏾💯

[@MrBluelock]

kzbin.info/www/bejne/mai7nnaelrmXh6s

[@MrBluelock]

kzbin.info/www/bejne/aZXGnKCJnNVkpNk

[@bentone23]

My pushamatic 50 amp 240 v 2 pole breaker for my air conditioner compressor had popped a few times when it’s really hot out. I put my fluke inductive amp meter on each line at the breaker. That read 24.6 and 24.4 amps. My question is, does the breaker pop when there is 50 or more amps on one pole or both poles?

[@dannystump5777]

Dustin another great video. You taught me something on this one! Thank you:)

[@mr.awesome8748]

Call me crazy, but I like how he goes through the code book, he explains these book very well

[@Phil-D83]

The "min"= max regular amp it trips at. The "max" (10000,etc) value = explodes in the pannel

[@Richard_OKeeffe]

Hi, in the UK we have 'Prospective Short Circuit' PSC Current for every installation this has to be know, even for domestic. We also have need to know for earth (ground) faults the Ze (external impedance) this is designed / measure at the source (service head) and the Zs (system impendence) this is designed / measured usually at the furthest point on each sub circuit. Zs can be measured as R1 + R2 (line resistance + circuit protective conductor [ground wire] + Ze) this then allows us to know via tables in the Regs BSEN 7671 (Code) if the circuit breaker or fuse will disconnect in the time stated in the Regs

[@Jeff-Lawrence]

Love it when you break open the code book. Awesome!

[@douglaskersey1831]

Thank you for the video's. Little jelly for those fortunate to Apprentice under you.

[@barrysharp3559]

In UK we call it max Ka which is usually 6000amps (6Ka)or 10,000 lamps (10Ka) but this can be lower in older breakers. I’m talking domestic and light commercial.

[@coldrider3517]

thank you for the vid ,i am looking for a 120DC 2 pole breaker that will trip at just that 120A , all i found yet will go over that b4 tripping . Another thing is i need ANL style fuse that bust at their set Amps rating . wiring the breaker & fuse in series how should i go ; Breaker then the fuse or Fuse then breaker , i have to mention that the breaker is intended as a switch (1st) and a cut off , Thank you for any parts suggestion and ideas you may pitch in , Best Regards & Cheers !

[@Jok-the-Mad]

I would recommend doing a video on the old "split bus" or "split main" panels from the 60s and 70s.

[@colinstu]

Six handle rule too

[@steve-o6413]

42 circuit Main and the need for Subpanels...

[@garbo8962]

No matter who made them they were dangerous to homeowners due to confusing way of securing all power.

[@garbo8962]

@@steve-o6413 Now can use 82 circuit panels. The large hospital that I retired from had at least 30 82 circuit 120/208 panels installed 5 years ago. All circuits feed from top of panels so it was a challenge. My boss insisted on no shared nuetrals & #10 copper wire for all 20 amp circuits to breakout junction box. Contractor ended up running a ton of 1" conduit out of panels. So hard to get 164 #10 wires neatly bundled in these panels aling with at least 10 #10 ground wires.

[@steve-o6413]

@@garbo8962 Hospital grade equipment has it's own section in the code book and you can't deviate from the blue print, everything is spect out because of different environmental hazards...

[@phillipsusi1791]

I'm trying to figure out why some circuits would need higher interrupting rating than others. If the panel can supply that much current, shouldn't they all need to have higher interrupting current? I mean the downstream short could happen very close to the breaker, in which case, the resistance of the wire there wouldn't make much difference right? Or is the current still limited by the wire so you would only need a breaker with higher interrupting capacity on a circuit if you had to oversize the wire for that circuit because it was a longer run?

[@MrBluelock]

Do some reading on interrupting rating. Specifically series rated systems(ones that have downstream devices with a lower IR than the upstream devices). In short, there are OCPD combinations that have been tested as a unit (such as panel boards), or in combination with each other (ex: breaker feeding a subpanel & the subpanel OCPD) to ensure that they can be used together under certain fault conditions.

[@steve-o6413]

Smaller circuits like 14gage wire can only deliver so much current in a dead short lager wire like 2/0 can deliver more...

[@phillipsusi1791]

@@steve-o6413 That depends on how long they are. Larger wire has less resistance per foot, so a heavy wire with a short 100 feet away is likely going to draw less current than a short on a thinner wire that is only 6 inches from the breaker.

[@steve-o6413]

@@phillipsusi1791 yes but on long runs you have to figure in voltage drop and may need to increase your wire size...

[@phillipsusi1791]

@@steve-o6413 That is why you might go with the next size up wire on a given run, but my point is that the short isn't always going to be at the far end of the wire. A smaller wire with a short that is much closer can draw just as much current as the heavier wire with a short at the far end.

[@spelunkerd]

In the 2021 Canadian CEC code (page 99, 8-304), breakers and fuses rated for continuous use at 80% are allowed to feed fewer devices than those rated for use at 100%. For example a 15A branch circuit fed by a breaker rated at 100% can feed 15 outlets, but a similar circuit fed by a breaker rated for use at 80% gets the old standard of 12 outlets. I've never seen that inscribed on breakers, where is that info? Is it a fair assumption that most are rated for 80% continuous use?

[@clarenceeverline5654]

Thank you my boss was talking about AIC today at work i agree more videos i am a visual learner

[@misaelmorenoluna7299]

I have a question that I've been thinking about for a while. When you have split phase circuit (ex. 240V load), and the circuit has a 30A breaker for example, does that mean 15A in each leg? I know it's a silly question, but since I deal with HVAC equipment rated for 240V, I'm always wondering, but I haven't found someone to explain it to me.🤔

[@ELTRENTOisbak]

You can use a double breaker as two single breakers to supply 120 volt to two separate circuits.. If you have a 30 amp double breaker, you can connect a single 10 gauge hot wire and it will work for 120 volt. You would NOT connect a 12 or 14 gauge wire to the 30 amp breaker or it creates a fire hazard. You can create a 240 breaker by combining 2 single-pole breakers, they must be located side-by-side, and code requires a 'common bar' between the breaker switches so if one trips, then the other breaker also trips. You would NOT use two 15 amp breakers. You would use two 30 amp breakers and 10 gauge wire. Calculations Volts x Amps = Watts is a basic electrical formula Volts (V or E) x amps (A or I) = watts (P or power) -Let's calculate watts for 120 volt single breaker -15 amp single breaker. 120 volts x 15 amps = 1800 watts of power -30 amp single breaker. 120 volts x 30 amps = 3600 watts of power. -Calculate watts for 240 volt double breaker. -15 amp double breaker. 240 volts x 15 amps = 3600 watts of power -30 amp double breaker. 240 volts x 30 amps = 7200 watts of power. With 240 volt, the watts or power is doubled .... Amps are not cut in half Since each leg of 240 volt circuit offers 120 volt potential to ground, then you're getting two legs of out-of-phase 120 volt when you use double breaker, and doing so doubles the voltage and doubles the watts (power), it does not halve the amps. This shows that each leg of 30 amp double breaker delivers 30 amps, and not 15 amps. waterheatertimer.org/are-both-sides-of-30-amp-breaker-15-amp.html

[@Shortcircuit220]

My job is to spec circuit breakers/panels based on the calculated fault current at each point in a system... AIC rating is a big can of worms lol AIC is all about keeping the breakers from exploding shrapnel everywhere. If a breaker experiences the full available fault current of a system you will be replacing the entire system. Hopefully the fault was not cause by someone dropping a wrench between live buss bars on a high AIC panel. They likely would not live due to the intense heat of the arc flash. (This is more a commercial/industrial situation but has happened)

[@EarthshipFreedom]

Is there a rubber plug available for all the little holes in J-boxes? Like the 2 in the front of a duplex receptacle cover and multiple on the sides, To me it seems like those should be plugged up for spark suppression and asthetics.

[@jaytea23]

Great video! Would love to see some videos about motor controls sometime soon

[@manuellastrollo2168]

What is AF? Can you discuss it all in one video. AF, AT, IR & sometimes there is a AS on elect plan. Please explain it all. Thankzs in advance

[@ChaplainDaveSparks]

So ... if the _Maximum Fault Current_ isn't calculated (or at least not displayed) for a *residential* service, is there a rule of thumb for calculating it? This residence was built in the 1950s in California, if that's of any help.

[@robertmeadows522]

I’m working on learning how to figure out what is the available amperage in a existing panel. I took a amp clamp reading of all 3 phases and it’s a 225a panel with 175a rated fused in the disconnect. I have A 69 , B 82 , C 73. So this is the part I am thrown by this is 224 total amps if this was the answer my 175 amp fuses would be blowing correct?

[@Mark-eu4di]

Justin great video, what about a video on how to wire ansul systems to shunt breakers?

[@Pgan803]

This is excellent explanation, TQVM. Can you show How to Calculate or Determine the Value of Breaking Current in a Circuit. This will help in choosing the Circuit Breaker. Also does thes values affect RCD? I think in BS7671 its called by several confusing names ..Icu, Ics, Icn, Icm

[@Roommate625]

During a short circuit or ground fault, the amount of amperage a component can see in the split second before a fuse/breaker opens can be SIGNIFICANTLY higher than the ampere rating for opening. This higher amperage can put significant stresses on the fuse/breaker that may cause them to blow up if they are not rated for it. The AIC rating is saying the fuse/breaker can handle this higher amperage and still do it's job of opening. kzbin.info/www/bejne/qofGpIWohLGEoqs 4:12 shows a 10kA AIC breaker with two 22kA AIC breakers. My understanding: As a general rule, be careful doing this. Panelboard SCCR rating will normally drop to the lowest AIC rated device. With that singular 10kA breaker the panelboard maybe rated 10kA which may be below the available fault current and the reason the original 22kA breakers where installed.

[@judih.8754]

Excellent explanation.

[@mathman0101]

Bro your living in my head been working through this material recently…..

[@paulinekristolentino4237]

I just subscribed to your channel - this is amazing and very easy to understand. Just have a question regarding the other ratings found in circuit breakers: how about ampere trip (AT) rating versus ampere frame (AF). thank you!

[@gustavoguidor156]

Thanks for sharing this information.

[@jayzrat]

Hi, just came across this video. So are you saying that an Ampere Interrupting Capacity (AIC) is not the same as a Minimum Interrupting Rating (MIR)? Still confused. Sorry.

[@garbo8962]

Question. Say you have a service panel with a 200 amp main breaker and 29 out of the 30 breakers are rated for 10KIC but the last one has a 5KIC rating. What then is the KIC rating of entire system? Ran into trouble on 3000 amp switchboards that had 480 volt 3 pole breakers from 400 to 800 amps with different KIC ratings that the company that performed yeatly maintenance & testing were not happy about that situation.

[@Roommate625]

Izzy, placing a single 5kA AIC breaker may lower the rating of that entire service panel to 5kA (SCCR rating of panel should be labeled in panel and generally reads, "the rating is equal to the lowest interrupting rating of any circuit breaker"). Example: If there is 9kA available fault current at the panel and a 5kA AIC breaker is placed in the panel, the panel is now rated for 5kA and is no longer legal and is a potential safety hazard.

[@garbo8962]

@@Roommate625 Thanks. Thought that might be true after we pulled out 480 volt breakers with something sround 30 or 35KIC to a switchboard that had all 65 KIC breakers. Never too old to learn. Disappointed in how many sparkies that I worked with or meet that never owned a code book. Worked at a large newdpaper when they were haf a large circulation but cheap skates. They refused to ever purchase at least 1 code book every 3 years or rubber gloves. Got tited of them always borrowing my code books so I locked them up. Told me that I was not a team player.

[@joetech5787]

Great turorial..👍

[@moe_2412]

Great video. It would be good to tie this into SCR for down stream components.

[@poohbears1995]

INTERRUPTING RATING vs AMPERE RATING . Do the Interrupting rating have a time limit on them ? like 10 ms. or not like for example AFCI? GFCI.?

[@Shortcircuit220]

Technically kinda but AIC rating is more about the breaker not exploding and throwing shrapnel everywhere. A full blown fault is the upstream transformer's magnetic field collapsing as fast as the impedance of the system (wires, bussing etc) will let it.

[@skinny01717]

"Lets *break* into it" I see what you did there.

[@mnewt712]

Good stuff! Thank you

[@elgranjero2284]

Thanks for this info.

[@Jason_Van_Stone]

I'm 6 years in the trade, and going back to school really sucks and I feel sorry for the one's that never had field experience and open the books like "what in the fk does all this mean???" 😆

[@bartmrok]

I am an electrician in Los Angeles. Here we struggle with the title 24 and the lighting control. Setting up the zones etc... Do you guys have title 24 in Austin/ Texas?

[@garbo8962]

I talked to an teacher/inspector at a IAEI class about some of these ridiculous energy codes. If a homeowner has to spend a hundred dollars to save a few cents a year to shut down a circuit that has a cell phone charger on it would take thousand years to even out. All for the energy saving that almost makes it impossible to only use LED lamps to meet code. Worked at a large candy/chocolate company back in the 80's. They had a dim witted energy engineer. He would shut boilers down on warm weekends but several times frooze hundreds of feet of 3" milk chocolate lines. One timebit took a dozen or more machanics 14 hours to clear the pipes causing 2 days of overtime to make up for lost production.

[@vanzsanchez6980]

Hi sir can you explain the differene between the ampere trip, ampere frame and kaic rating of a ciruit breaker??

[@carultch]

The frame rating is the physical size of the breaker, associated with the largest trip rating in that particular physical size. It is the "bin" of components that the manufacturer uses to make 99% of the breaker. Rather than making specialty breakers in every amp rating, the manufacturers group similar amp ratings into one family of products, that all use the same housing, the same lugs, the same handle, etc. The essential difference is the calibrated trip mechanism. Generally, frame ratings follow standard disconnect blade ratings, such as 60A, 100A, 200A, 400A, 600A, 800A, and 1200A, but manufacturers may vary. The trip rating is the rating is the ampere rating that we usually mean, when we speak of the rating of the breaker. This is the rating of the calibrated trip mechanism inside (the bimetallic strip for the thermal part, and the solenoid for the magnetic part). Or it could be a configurable setting on a breaker with an adjustable trip dial. The KAIC rating, is kilo-amps-interrupting-capacity. It refers to the maximum amount of short circuit current that the breaker can "survive" before it catastrophically fails. Between the trip rating and KAIC rating, the breaker is rated to safely interrupt the overcurrent. Above the KAIC rating, you can expect the breaker to be permanently damaged. It ultimately means that the manufacturer hasn't tested it beyond that rating, so it still could "survive" an overcurrent slightly larger than this, but don't count on it.

[@eduardorivas363]

Buck and boost calculations or how to size?

[@DColcla]

your electrical videos have taught me so much. Man, I love your them. Do you have an account on Rumble? I am unable to find you there. If not there would you please consider creating an account there as well?

[@BLud_Bro_FoE]

Good video bro

[@unstoppable008]

All my bell icon peeps REPRESENT!

[@votown1003]

What's a 2 wire sensor vs 3 wire sensor ?

[@steve-o6413]

This is a subject that most Electricians don't understand, why does the breaker give a low amperage rating along with a high amperage rating 15amp for low and 10,000 for high. Because it needs to protect for both...

[@1495978707]

Why do fuses have a maximum current? They’re going to burn up either way, how does high current prevent that from happening?

[@jacobmillyard6799]

If you are speaking of the continuous current rating, then they have the rating to coordinate with the load and supply conductors to provide both protection and prevent nuisance outages. With regards to interrupting rating, the fuse needs to be able to fail safely and provide and stop the over current or fault. If the fuse is not rating for the larger fault currents (ie 100ka or more) the fuse may provide a path for arcing and may not clear the fault safely.

[@gerardorodriguez9745]

What happens when the current exceeds the interrupting rating in the breaker? 1.The breakers didn't detect the short circuit 2. The breaker detect the short but the main breaker also detect the short I want to know the answer

[@jakesully5402]

All the breakers in line are detecting the short. The one with the lowest IR rating should ( and I emphasize SHOULD….) trip first. I say “should” because I’ve seen a cut live wire ( my first rookie mistake, even before my first 347 volt shock) shut down an entire panel in a call centre. Yup !! How’s that for a rookie move ? Heh heh. Needless to say, I needed new pliers that day…..

[@jb7702]

Theoretically, the AIC is the amount of current a breaker or fuse can withstand before it becomes a welded short circuit.

[@nickdangelo2591]

can you explain fault current calculations , maybe give us some examples how to work the math ?

[@carultch]

The short answer is that an upper limit to the fault current available at a given point, is the amps associated with a transformer KVA rating, divided by its impedance as a decimal. This assumes there are no significant sources of fault current on its secondary, such as motor loads, which can add to it. You also can reduce it, when accounting for the impedance and length of the conductors, from the transformer, to each point within the circuit, so generally, available fault current decreases, the farther from the service point you are. This also assumes "infinite bus", which means that there is infinite fault current available on the primary side. There is a much more complicated calculation that accounts for utility primary current, and determines the available fault current on the transformer secondary. This calculation approaches a "cruising altitude" (i.e. asymptote) as the primary side fault current gets large, and that "cruising altitude" is the infinite bus value.

[@ramandeepsingh391]

Thank you 🙏

[@mepadda]

Wao it's amazing bro

[@gutterboy916]

Q and A day!!

[@tedh9211]

How about switching current electric service to underground service

[@Nick-bh1fy]

Going from overhead to underground? I’d look into ur local hydro company but tbh I don’t think they’d swap out one service just for u

[@TheGalacticWest]

I assume it’s either how far it needs to separate to prevent arcs or how high of a current draw it needs to trip. Now on to the video.

[@alejandrovelasco9573]

What is an ampere frame then?

[@fxgamer-11yt]

I can do a video testing this safely on 12 volts if you need me to

[@elc2k385]

Yes. YES! More videos!

[@tallbrian100]

Photoelectron poped a 5000 Amp fuse.

[@possibility28able]

If you've got federal pacific, replace that sh/t!

[@mikeadler434]

👍

[@ryanb1874]

Are these just spikes, n so now 10000 amps, has to be...,

[@yellow8954]

🔔🛎

[@clems6989]

This vudeo is full of wrong information.