@@nics-systems-electric oh then the panel is just going to be in battery mode when the power is out you should acknowledge the panel so it wouldn’t beep
Yrs ago at my old job, tree roots broke thought rusted underground conduit (120/208V 3 phase) shorted out two phases, blew the utility fuses. 95% of the power was out, just a few dim lights were on. The conductors were replaced, along with a new main panel. A truck mounted generator was brought in to keep the power going, during the installation.
We have two 13.8 kV feeds into the hospital I work at, if the "dedicated" feed goes out or loses a phase it will switch to the alternate feeder and stay there if its "good" if they are both in a single phase state or out completely the breakers open and wait until one or both come back and are "good"...... Eliminates extended time running in a single phase condition... while this is going on the transfer switches have already detected problems, started and transferred essential loads. Really neat how it all works
I take the two 13.8kV feeds are powering a transformer vault inside your hospital? With a back-up cutting in the alternate phase if one fails on the primary side? i.e. A back up cuts in?
@@TheTheo58 In a round about way yes.... the 13.8kV feeders enter a double ended switchboard, one main and the tie breaker are closed at any given time, from there it goes out to other substations on campus BUT if the automation system on that board detects a phase loss or a complete outage on the "dedicated" feeder it will open its respective breaker..... If the "shared" backup feeder is ok its breaker will close and the campus will be fed off that feeder.. If the "dedicated" feed returns to normal no switching will occur, we have to switch back manually.. Should there be an outage or phase loss on BOTH the dedicated and "shared" backup feeder simultaneously, the main that was supplying the building at the time will open and the board will sit like that until one of the feeds gets restored. At that point its main will close after a period of time to ensure the supply is stable... There are also 5 diesel generators that back up the essential power circuits through various transfer switches and electrically operated air circuit breakers... Those are at the 600V distrubution level... O ya... "Dedicated" as in that feeder originates from a Hydro one transformer station a few km away and is ONLY for our building.... The "Shared" Backup is another circuit out of that same transformer station but serves other loads in the area (apartment buildings etc) and likely now that our utility is automating things, it can be supplied from another circuit or another transformer station via automatic pad mount and pole top switches.
Shouldn't there be a safety in place to automatically open the phases in the event of a loss of any phase? My employer had an automatic phase "breaker" that would open in the event of any phase loss or phase voltage deviations greater than 6%. This would open all 3 phases instantly keeping any 3 phase motors from be damaged. This also kept parts of the building from have no lights because some location had lighting and emergency lighting on a separate phase. When the problem cleared the breaker would automatically re-close after about 30 seconds. It's was a pain during storm, if there was a phase deviation but the we did have a generator with commit to backup the building.
We had a power outage yesterday. Two phases gone, oneof them was turning of and on per second. Some workers at a construction side made a mistake with the wireing😂
Within my final month of college, the side of campus that the electrical building is in (where my class is) lost a phase and the other 2 phases were low voltage making lights flicker and definitely made the generator take over emergency loads! Turns out some idiot cut down a tree that took put the power lines. College maintenance killed the main shutoff to each affected building and made everyone leave.
I remember this happening to my school back in elementary school, two phases were lost. but funny thing is the girls were very unhappy because the men's restrooms were on the phase that was still online, and the women's restrooms were not so uhhh, womp womp girls I guess?
I see the skull has at least one APC smart UPS, but it must have been made around the time that I have purchased my UPS backups pro as it makes that same four beeps every 30 seconds when the power's out
Funny enough, it litteraly just happened where I work at, 3h after watching this video.. all lights started flickering and 1/3 of the building was off..
Last September there was a problem with the recloser where i work and the whole facility lost a leg. Several motors were damaged, even the ones that had starters and phase loss protection. Dozens of control transformers and contactor coils had failed from the back feeding. It was a busy week following that incident. GA power installed a new recloser that will interrupt all three legs should any of them see a fault.
the building i live in the service is 480 at 1,250 amp service but its been cut down big time the designer speced everything elextric we removed all the basebord heat wall heat ect got rid of one of the large panels because of it
That is odd. When a tree branch touched the line on our street (single phase), the fuse blew in half. Those look like they were pulled open on purpose. Several year ago a building I take care of had an electrical fire in the vault out in the street (underground 480 volt 3 phase feed). The smoke billowed out of the vault in the street and smoke followed the conduit into the building, setting off the fire alarm. One of the phases had shorted out in the vault. This was in January (fortunately a WARM January night at 11 pm). Problem was that it was the phase that fed a step down single phase transformer that powered the lights and furnaces. The other two phases were on. The only 3 phase loads in the building are A/C units. It was a LONG night waiting for the utility to get it fixed and the building ventilated. Nothing like the smell of burnt wire insulation! If the wires in the box had been long enough, possibly could have switched the transformer to a powered phase.
At least it isn't the old Edwards 6500 system that didn't have battery backup when the power at this school went out otherwise if an alarm occurred on this system then nobody won't respond
@@nics-systems-electric you can get different specialty ones that will protect for instance against phases dropping out and other ones that will disconnect the voltage is out of spec
so what happened? was it a phase to phase short between A and B that blew out the fuses ? A fuse was clearly blown with the spring popped out of it. B fuse however looked fine.
Why doesn’t the school have a generator? Penny wise & pound foolish. Great explanation on resistive load for the common man. I’m surprised the motor controls don’t automatically shut off with the loss of power on one phase let alone two?
@@DanTDMJace Schools can be retrofitted with generation. I'm surprised you went outside to see what have caused those two doors to fall open? BTW? Did you get that lineman's permission to film him before he went to go close those switches? I'm a lineman & don't like it when people film me. That video can be held as evidence against me by my employer if something happens & I get hurt. Or if they want to ding me for a safety infraction? You're right about the two phases being close to each other. We put the center phase in the middle on a ridge pin so everything is equally spaced unless there is a tree in the way? Looks like there needs to be lots of tree trimming done in that video? Great video & informative to those not in the trade.
Very few of the schools do have generators only the ones that are used as community emergency shelters and ones that are in rule areas that lose power frequently.
@@kevxsi16v Only our high school has a gen set because it's a designated emergency shelter for the area. It only powers life / safety and basic heat / lights. Life / safety = elevators, alarm systems, and water. The other 5 schools in town have nothing.
This happened at a school here. Basically 120 volt c phase and ground. 2 fuses blew on the triplex. But why? I still wonder to this day. How come this happened to you. Was it from the wind?
WRONG terms used.On three phase systems when you loose one phase that's single phasing. School lost two of the legs. Wrong again at 2:20 saying you don't want three phase motors running on two.phase. IMPOSSIBLE. Two phase motors have 4 wires feeding motors. Reinstalled a rewound two phase two speed motor that had 8 wires to motor starters. Any lost of one or two phases will never produce two phase! Have installed two phase motors and installed two phase 4 & 5 wire systems.
Each phase is a leg and each leg is a phase. And no that's not wrong you indeed do not want three phase motors running on two phases that will damage them.
Luckily the fire alarm panel runs on its own battery although won’t last that long as the generator is not powering it
There is no generator. The fire alarm system will go for of time minimum 24 hours in standby.
@@nics-systems-electric oh then the panel is just going to be in battery mode when the power is out you should acknowledge the panel so it wouldn’t beep
@@VOLTRONDEFENDER4440 it was acknowledged
@@nics-systems-electric I’m guessing the reason there was stil light was because ether a generator, power station or emergency lights
@@VOLTRONDEFENDER4440 I explained everything in the video
That is exactly what happened to my high school back in November of 2023!!! We lost two phases that day!
Yrs ago at my old job, tree roots broke thought rusted underground conduit (120/208V 3 phase) shorted out two phases, blew the utility fuses. 95% of the power was out, just a few dim lights were on. The conductors were replaced, along with a new main panel. A truck mounted generator was brought in to keep the power going, during the installation.
We have two 13.8 kV feeds into the hospital I work at, if the "dedicated" feed goes out or loses a phase it will switch to the alternate feeder and stay there if its "good" if they are both in a single phase state or out completely the breakers open and wait until one or both come back and are "good"...... Eliminates extended time running in a single phase condition... while this is going on the transfer switches have already detected problems, started and transferred essential loads.
Really neat how it all works
I take the two 13.8kV feeds are powering a transformer vault inside your hospital? With a back-up cutting in the alternate phase if one fails on the primary side? i.e. A back up cuts in?
@@TheTheo58 In a round about way yes.... the 13.8kV feeders enter a double ended switchboard, one main and the tie breaker are closed at any given time, from there it goes out to other substations on campus BUT if the automation system on that board detects a phase loss or a complete outage on the "dedicated" feeder it will open its respective breaker..... If the "shared" backup feeder is ok its breaker will close and the campus will be fed off that feeder.. If the "dedicated" feed returns to normal no switching will occur, we have to switch back manually..
Should there be an outage or phase loss on BOTH the dedicated and "shared" backup feeder simultaneously, the main that was supplying the building at the time will open and the board will sit like that until one of the feeds gets restored. At that point its main will close after a period of time to ensure the supply is stable...
There are also 5 diesel generators that back up the essential power circuits through various transfer switches and electrically operated air circuit breakers... Those are at the 600V distrubution level...
O ya... "Dedicated" as in that feeder originates from a Hydro one transformer station a few km away and is ONLY for our building.... The "Shared" Backup is another circuit out of that same transformer station but serves other loads in the area (apartment buildings etc) and likely now that our utility is automating things, it can be supplied from another circuit or another transformer station via automatic pad mount and pole top switches.
This happened at a place I worked out years ago. No AC and only parts of the building was working.
Great video. I like power outage videos on your channel too
Pretty interesting scenerio, thanks for all the explanation and coverage Nic.
Was there anything else concerning during the single phase? And do you guys also consider that a brown outage
No weird issues here
Shouldn't there be a safety in place to automatically open the phases in the event of a loss of any phase?
My employer had an automatic phase "breaker" that would open in the event of any phase loss or phase voltage deviations greater than 6%.
This would open all 3 phases instantly keeping any 3 phase motors from be damaged.
This also kept parts of the building from have no lights because some location had lighting and emergency lighting on a separate phase.
When the problem cleared the breaker would automatically re-close after about 30 seconds.
It's was a pain during storm, if there was a phase deviation but the we did have a generator with commit to backup the building.
We had a power outage yesterday. Two phases gone, oneof them was turning of and on per second. Some workers at a construction side made a mistake with the wireing😂
Within my final month of college, the side of campus that the electrical building is in (where my class is) lost a phase and the other 2 phases were low voltage making lights flicker and definitely made the generator take over emergency loads! Turns out some idiot cut down a tree that took put the power lines. College maintenance killed the main shutoff to each affected building and made everyone leave.
It happens
I remember this happening to my school back in elementary school, two phases were lost. but funny thing is the girls were very unhappy because the men's restrooms were on the phase that was still online, and the women's restrooms were not so uhhh, womp womp girls I guess?
lol 😂
I remember back in the day when we.would had to cut the power to 3 phase motors
I see the skull has at least one APC smart UPS, but it must have been made around the time that I have purchased my UPS backups pro as it makes that same four beeps every 30 seconds when the power's out
There are many to keep data and communications working
Funny enough, it litteraly just happened where I work at, 3h after watching this video.. all lights started flickering and 1/3 of the building was off..
Last September there was a problem with the recloser where i work and the whole facility lost a leg. Several motors were damaged, even the ones that had starters and phase loss protection. Dozens of control transformers and contactor coils had failed from the back feeding. It was a busy week following that incident. GA power installed a new recloser that will interrupt all three legs should any of them see a fault.
the building i live in the service is 480 at 1,250 amp service but its been cut down big time the designer speced everything elextric we removed all the basebord heat wall heat ect got rid of one of the large panels because of it
- how did you start working with your school district? who did you ask about it?
It wasn't a matter of one conversation or something that was planned it just worked
@@nics-systems-electric how did you get that job though? what "just worked"?
@@wibwabz it's really not easy to explain and I don't really know just getting to know people and hanging around with them
@@nics-systems-electric haha, okay.
That is odd. When a tree branch touched the line on our street (single phase), the fuse blew in half. Those look like they were pulled open on purpose.
Several year ago a building I take care of had an electrical fire in the vault out in the street (underground 480 volt 3 phase feed). The smoke billowed out of the vault in the street and smoke followed the conduit into the building, setting off the fire alarm. One of the phases had shorted out in the vault. This was in January (fortunately a WARM January night at 11 pm). Problem was that it was the phase that fed a step down single phase transformer that powered the lights and furnaces. The other two phases were on. The only 3 phase loads in the building are A/C units. It was a LONG night waiting for the utility to get it fixed and the building ventilated. Nothing like the smell of burnt wire insulation! If the wires in the box had been long enough, possibly could have switched the transformer to a powered phase.
That downward position is normal for a blown fuse. The internals of that assembly are under tension and release a holding clip when they blow.
Nice! Just got back from outside, just what i needed! Also, second lol.
Great video. Thank you for sharing. May I ask, is this for U.S.A or Canada ?
Canada
At least it isn't the old Edwards 6500 system that didn't have battery backup when the power at this school went out otherwise if an alarm occurred on this system then nobody won't respond
It had newer batteries before it was removed
Good job you are always there for the rescue I love your channel ❤❤❤
Same
Is there any reason why circuit protection is not introduced that monitors the dropout of phases?
I don't exactly know what you mean most breakers only protect from overcurrent
@@nics-systems-electric you can get different specialty ones that will protect for instance against phases dropping out and other ones that will disconnect the voltage is out of spec
@@UKsystems usually that's what your generator transfer switch does which if you have critical equipment it's going to be on
Good job
so what happened? was it a phase to phase short between A and B that blew out the fuses ? A fuse was clearly blown with the spring popped out of it. B fuse however looked fine.
Good Moring NIC’S - SYSTEMS & ELECTRIC
Why doesn’t the school have a generator? Penny wise & pound foolish. Great explanation on resistive load for the common man. I’m surprised the motor controls don’t automatically shut off with the loss of power on one phase let alone two?
It's from the early 90s I think
@@DanTDMJace Schools can be retrofitted with generation.
I'm surprised you went outside to see what have caused those two doors to fall open? BTW? Did you get that lineman's permission to film him before he went to go close those switches? I'm a lineman & don't like it when people film me. That video can be held as evidence against me by my employer if something happens & I get hurt. Or if they want to ding me for a safety infraction?
You're right about the two phases being close to each other. We put the center phase in the middle on a ridge pin so everything is equally spaced unless there is a tree in the way? Looks like there needs to be lots of tree trimming done in that video?
Great video & informative to those not in the trade.
Very few of the schools do have generators only the ones that are used as community emergency shelters and ones that are in rule areas that lose power frequently.
Great video😄
What school wouldn’t have a generator they are the best thing to have in a power outage
Most don't
I look after 35 schools in the U.K. none have generators
@@kevxsi16v Only our high school has a gen set because it's a designated emergency shelter for the area. It only powers life / safety and basic heat / lights. Life / safety = elevators, alarm systems, and water. The other 5 schools in town have nothing.
we had something similar happen at my work (factory) not that long ago.
I am getting insulation in my attic today and garage
Power Outages give me a weird feeling lol
Something like this happened at my high school this past school year (power partially out (was fixed same day))
Oh sh*t idk what to say but atleast there sole ups
leave on phase 3 and call it a day
Good job rescuing power
I love single phase power outage ❤
The lights that run on A or B phase: **dies**
This happened at a school here. Basically 120 volt c phase and ground. 2 fuses blew on the triplex. But why? I still wonder to this day. How come this happened to you. Was it from the wind?
Wires blowing in the wind A and B went phase to phase
What would cause something like this to happen
I lost all my phases😢
Can I get shout out plz
Question: bro posted it last night
Passenger lifts are 3p
problay a brownout i live in tennseee so ya
A brown out is a reduced voltage this was two phases lost completely
@@nics-systems-electric ah ok, they look the same.
WRONG terms used.On three phase systems when you loose one phase that's single phasing. School lost two of the legs. Wrong again at 2:20 saying you don't want three phase motors running on two.phase. IMPOSSIBLE. Two phase motors have 4 wires feeding motors. Reinstalled a rewound two phase two speed motor that had 8 wires to motor starters. Any lost of one or two phases will never produce two phase! Have installed two phase motors and installed two phase 4 & 5 wire systems.
Each phase is a leg and each leg is a phase. And no that's not wrong you indeed do not want three phase motors running on two phases that will damage them.
Great video good sir!