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Started By
Message
PSA: 48V ~10A is bad mkay
Posted on 9/25/17 at 9:42 am
Posted on 9/25/17 at 9:42 am
Morning OT'ers just wanted to share my near death moment that happened 30 minutes ago.
Working in the lab and removing old equipment for new shite. Everything runs on 48V / sharing ~500A via power distribution.
I hit the breaker and like normal everything shuts off from the breaker below. Remove the old equipment no prob. Grab the power line to the breaker and push up on it and BOOOOOM!
Power flash and smoke
. All I could say is Oh shite! Happened so fast . A good 5 inch arc happened inside the cabinet 
I dont smoke but need a cigg right now.
tl;dr Dear Facebook.
Working in the lab and removing old equipment for new shite. Everything runs on 48V / sharing ~500A via power distribution.
I hit the breaker and like normal everything shuts off from the breaker below. Remove the old equipment no prob. Grab the power line to the breaker and push up on it and BOOOOOM!
Power flash and smoke
. All I could say is Oh shite! Happened so fast . A good 5 inch arc happened inside the cabinet I dont smoke but need a cigg right now.
tl;dr Dear Facebook.
This post was edited on 9/25/17 at 2:49 pm
12
Posted on 9/25/17 at 9:45 am to 50_Tiger
Like my old Cajun friend would say. "Tell me what you learned from dat"
Posted on 9/25/17 at 9:50 am to 50_Tiger
Yea arc flashes aren't to be taken lightly
Posted on 9/25/17 at 9:53 am to 50_Tiger
quote:
Power flash and smoke . All I could say is Oh shite! Happened so fast . A good 5 inch arch happened inside the cabinet
Definitely would have had to change my pants
Posted on 9/25/17 at 9:54 am to Tigeralum2008
Were all laughing in the lab now after we evaluated the line but holy shite in the almost three years in the lab that was a first .
At least I would of died in my Saints polo
. At least I would of died in my Saints polo
Posted on 9/25/17 at 9:55 am to 50_Tiger
Reason number 3,204 why I refuse to mess with electricity. I do minor household and vehicle repairs with the help of YouTube but I absolutely refuse to frick with wiring.
Posted on 9/25/17 at 9:56 am to LSUEnvy
quote:
"Tell me what you learned from dat"
You know - back in the day of tube televisions, before most of you baws were born, lots of amateur handymen got quite the shock while working on TVs that were unplugged.
I just assume that everything with a DC converter or any dense capacitor field holds a potentially fatal charge for up to 24 hours after disconnection.
And, I might just run test equipment on it to make sure it is not charged, anyway, particularly if it isn't my system or system design.
Posted on 9/25/17 at 9:57 am to ClientNumber9
quote:
Reason number 3,204 why I refuse to mess with electricity. I do minor household and vehicle repairs with the help of YouTube but I absolutely refuse to frick with wiring.
Yeah I'd play with structural stuff everyday over touching anything electrical.
Posted on 9/25/17 at 9:59 am to 50_Tiger
There's at least one poster here, can't remember the name, who would be like "shite bro, I change those things hot, no need to turn the power off" 
Posted on 9/25/17 at 10:01 am to 50_Tiger
quote:
I hit the breaker and like normal everything shuts off from the breaker below. Remove the old equipment no prob. Grab the power line to the breaker and push up on it and BOOOOOM!
Power flash and smoke . All I could say is Oh shite! Happened so fast . A good 5 inch arch happened inside the cabinet
Do y'all wear arc-flash resistant PPE in your MCCs? If you're in a lab, what the hell were you doing moving/re-attaching equipment with live power?
My goodness that's a safety video waiting to happen.
Someone gone get a fussin at.
This post was edited on 9/25/17 at 10:04 am
Posted on 9/25/17 at 10:03 am to 50_Tiger
quote:
10A
Here is your problem, all the cool kids do 30-A
Posted on 9/25/17 at 10:08 am to 50_Tiger
You still got your eyebrows baw??
Posted on 9/25/17 at 10:08 am to ClientNumber9
quote:
Reason number 3,204 why I refuse to mess with electricity. I do minor household and vehicle repairs with the help of YouTube but I absolutely refuse to frick with wiring.
Residential electric, at least on < side of the breaker box, isn't so hard to work with. You just gotta have your breakers probably labeled and double check that you are turning off what you are thinking you are turning off before you mess with it.
Posted on 9/25/17 at 10:09 am to mikelbr
quote:
Do y'all wear arc-flash resistant PPE in your MCCs? If you're in a lab, what the hell were you doing moving/re-attaching equipment with live power?
My goodness that's a safety video waiting to happen.
Someone gone get a fussin at
The power from the breaker to the rack was off.
The breaker blew when I tugged the line for some reason. The discharged arc'd to the rack which is properly grounded. So technically the discharge went where it's designed to go
Posted on 9/25/17 at 10:10 am to ksayetiger
quote:
Here is your problem, all the cool kids do 30-A
Our RNC's and larger 48U Racks do that. These are server chassis though and we absolutely rarely change them. The blades themselves are hot swappable.
Posted on 9/25/17 at 10:11 am to ksayetiger
quote:
Here is your problem, all the cool kids do 30-A
golf clap
Posted on 9/25/17 at 10:21 am to ClientNumber9
Problem is that the "electricians" can learn 90% of what they need to know on the first day. It's the other 10% of knowledge they never bother to acquire that makes a lot of them fricking amateurs just looking to make a quick buck.
Posted on 9/25/17 at 10:24 am to ksayetiger
quote:
Here is your problem, all the cool kids do 30-A
Well done
OP probably doesn't even have a sticker on his mid-size SUV
Posted on 9/25/17 at 10:50 am to ClientNumber9
quote:
I do minor household and vehicle repairs with the help of YouTube but I absolutely refuse to frick with wiring.
It's really not hard to work with, basic tools and common sense. My parent's dryer was incorrectly wired up when installed 13 years ago and it killed one pole of the 2-pole breaker so the dryer was only getting 120V. $9.31 replacement breaker and a few minutes to fix everything, much less than getting an electrician to even look at the problem.
Posted on 9/25/17 at 10:54 am to 50_Tiger
quote:
The discharged arc'd to the rack which is properly grounded. So technically the discharge went where it's designed to go
You're technically lucky to not be in a hospital (or worse).
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