Crazy Electrical Find 😳⚡️
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- Опубліковано 30 кві 2024
- This was a scary electrical find. I’m just glad I caught it and didn’t get hit by 277v.
Additional context: Normal circuit was completely off (locked out and tagged out at the breaker). The whip shown in the video had already been disconnected from the normal J-box and was connected to the light. To prevent shutting off all of the lights in nearby occupied hospital corridors, I had planned to de-term normal power first and then disconnect the life safety power. Yes, this takes a little more time but it’s much less impactful for the hospital. After recording this video and completely demoing out the light, I confirmed that whoever made up the light had accidentally crossed the neutrals in the light. This essentially caused life safety to go in through the life safety hot and out through the normal neutral and (vice versa). I misspoke in the video and said that the life safety circuit was being back fed through the neutral when I meant to say that the life safety circuit was completing its path back home through the normal neutral.
Voltage was checked from neutral to ground.
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Additional context: Normal circuit was completely off (locked out and tagged out at the breaker). The whip shown in the video had already been disconnected from the normal J-box and was connected to the light. To prevent shutting off all of the lights in nearby occupied hospital corridors, I had planned to de-term normal power first and then disconnect the life safety power. Yes, this takes a little more time but it’s much less impactful for the hospital. After recording this video and completely demoing out the light, I confirmed that whoever made up the light had accidentally crossed the neutrals in the light. This essentially caused life safety to go in through the life safety hot and out through the normal neutral and (vice versa). I misspoke in the video and said that the life safety circuit was being back fed through the neutral when I meant to say that the life safety circuit was completing its path back home through the normal neutral.
Voltage was checked from neutral to ground.
good catch. 277 freakin hurts
Yup always good to use the meter after the hot stick.
The hotstick would still show that, would it not?
@@chprod4303 well if you're willing to trust your life with just a hot stick verse spending the extra minute to grab the meter I'm not going to judge.
Grid guy here. So that's why you sparkies take so long. Lol just kidding. I wouldn't fuck with electrical work myself. Good work out there. Also, fuck hospital jobs.
Can you make it so tiles actually open thanks. just kidding sorry bro but...
Got to check it twice
"Crazy find"... Indeed.
The neutral wire causes so many problems in Electrical. Exactly why you can’t just connect all the neutrals in a box
You can shut off the power to a circuit and the neutral might still be hot from another circuit
I had a journeyman who had the simmular thing happen to him. Was working on some lights fed by normal power that were back fed by the neutral on the emergency power lighting crkt. He got bit and it hurt the hell out of him. Test before touch my friends. Also screw the guy who wired those lights up like that
Good find
And this why hospital works are too much of an headache w/ codes & backup power that U CANT turn off😂
Back fed neutral sharing phase. This is why they have now changed the code making it against code to share neutrals. Each circuit must now have its own neutral.
This isn’t a shared neutral actually. In the light there were two ballasts. One was meant for life safety power and the other was for normal power. Whoever wired up the neutral accidentally swapped the neutrals coming from the ballasts, making the normal complete its circuit through the life safety neutral and vise versa. A very strange scenario. I do see shared neutrals all the time too though.
@MadElectrician Is it the result of two hots sharing one neutral? If not, then what the fault is called? If this fault is coming from open neutral, then the voltage should be normal if, for example, the V between N and L is 230. If the voltage between N and earth is more than 270 volts, what should we consider? I hope you help.
@@azizahmedmuhammad4124lighting here in commercial and industrial buildings in the us use 277 volts. You can string a lot of lights on one crkt when it's 277.
Please explain. It appears there are Two seperate whips going to the fixture. 1-normal power. 2-life safety power. I dont see how they could have crossed neutrals ? Normal power and the life safety circuit should be in seperate pipes.
Correct. Two separate whips coming from separate boxes/ power sources. There were two ballasts in the light. Whoever made these up landed a hot from normal power and the neutral from life safety on one ballast and vise versa. So the neutrals got crossed in the light and tied into the wrong ballasts.
Gloves help to soften the zap ..
watch out for that 347,ie 600 3 phase
Be careful man
Only one white in that whip so ya it carrying both.. make sure you unplug the battery back ups too they can back feed through too.
There were two separate whips going to the fixture that had two separate ballasts in it. Somebody tied life safety power to one ballast and normal power to the other, but then accidentally got the neutrals crossed.
that’s a good find, what made you think to check?
Safety. I think this video is to prove that you can't assume because you turned off the normal power, that the wires would be safe. He checked just in case and thankfully he did. Doesn't hurt to check and most of the time you'd probably be fine. This was not one of those times.
Those shared neutrals are a pain in the rear when you think the power is off guess what it’s not and then you get zapped with whatever voltage whether it be 120 or 277
277 freakin stings... (Says the low voltage tech) 🙄.
@@jondoe2099bro i got zapped by 277 from a the wire nut threads that got sent the wire nut n was stuck for like 2 seconds but my body didn’t lock up so i was able to let go my whole body was literally like seizing when i got shocked and i was so tired after
I don't know US wiring system. in this situation I call floating neutral.
What meter is that?
Fluke 376 Clamp On Meter
What does being bit by 277 mean? Why exactly 277? (Sorry if a dumb quetion😂)
It means getting shocked .
Shocked by 277 volts.
277v is used for some things here in the US.
227v is common in the USA for industrial and commercial lighting. It comes from a single “hot” of some 3 phase 480 volt systems. 480v divided by the square root of 3 yields 277 volts.
@@joshm3563 thank you, that was the answer i wanted
Isn’t that something people do in order to “save money on wiring” ??
Way is the high Price in fluke climp mater
Well lets explain your conundrum. You are working on a 3ø phase system. That means three (1+1+1=3) legs of power can share a common grounded conductor (neutral for the non electrician) which mean when you kill one leg of power there are still two more legs sharing that common. (1+1-1=2) which means your "neutral" has a LOAD on it. The only way to remove the load is kill the two othere breakers. It will not be hard its either the two above, the two below or one above and one below the breaker you locked out... you did lock it out and not just turn it off didn't you?
This was not a shared neutral situation as you’re describing.
This was a situation where two completely different systems of power (two completely separate panels) were feeding the same light but their neutrals got crossed.
As mentioned in the video, the circuit coming from the normal power panel was shut off (breaker off, locked out, and tagged out) and circuit coming from the life safety panel was still on. Turning both off would shut a whole corridor of lights off in an occupied hospital so I was removing normal power first, then life safety.
There were two ballasts in the light. Normal power was tied to one and life safety to the other. A common thing for many older fixtures at this particular hospital. The problem is, whoever tied power to the ballasts in the lights got the neutrals from the ballasts swapped.
Essentially the circuit coming from the normal power had its “return path back home” through the neutral going to the completely separate life safety panel and vise versa.
Nice explanation! Thanks!
Never heard it called life safety. We call it emergency power. Normal power goes out, emergency power kicks in.
There are different classes of emergency power;, emergency, life safety, critical and equipment. Class is determined by the time it takes to transfer and what it is allowed to feed.
We don't share neutrals anymore
This wasn’t a shared neutral situation.
I've heard of an apprentice digging in a box and the neutrals were tied together he ended up getting hung up on 277 he's alive but like you said always test and always verify zero volts
Bit? 277 will kill you?
Bit is a term that electricians in my area use that means shocked. 277v can most definitely kill you. Usually people are lucky enough to just get shocked, but it can electrocute you, especially if you get hung up. Hung up means that you accidentally come into contact with it and can’t let go of the wire or whatever else you might be grabbing. When you get shocked your muscles are often times not capable of letting go of things, so when you get hung up you are continuously shocked until you get electrocuted. There’s nothing magical about 277v in particular, except that it’s higher than 120v (standard voltage here in the US) and packs a much bigger punch. I believe it’s more common for people to get hung up on 277v.
as an employer it pisses me off when I seen employees like this guy, making a video on MY DIME......
Sent it to my general foreman (I’m the foreman on my crew) and used this a safety demonstration. First time many guys on our crew have seen something like this. I think the 60 seconds of filming was well justified when it could potentially save someone from getting hurt or even worse.
Why dudes like you have no loyalty, making videos on your dime…gtfo of here son
lol well nobody gives a shit.
@@blueoval250 and you are that nobody , replying to a comment more than 30 days old , what a loser - get a life 🤣😂🤣
@@MadElectriciangood for you man great information