General > General Technical Chat
Arc blast - is is something for “normal” people to worry about?
Psi:
--- Quote from: SeanB on January 10, 2024, 12:51:31 pm ---
--- Quote from: Psi on January 10, 2024, 12:32:00 pm ---
--- Quote from: T3sl4co1l on January 10, 2024, 10:27:53 am ---but it can cause extended damage to circuitry -- burned traces, pads, damaged nearby components as the ball of plasma sinks current into anything conductive nearby.
--- End quote ---
You forgot "taking a sizable chunk of metal out of your side-cutters and turning them into wire strippers" :-DD
--- End quote ---
got those..........
--- End quote ---
Everyone accidently cuts an actively powered mains cable once.
If you're lucky you learn the lesson using your budget cutters and not on the lindstroms.
NiHaoMike:
--- Quote from: Berni on January 10, 2024, 11:02:57 am ---Another scary thing for arc flash are the giant UPS units that supply entire buildings. Those have a room full of lead acid batteries that will happily produce many thousands of amps at a few 100 volts. Being DC the arc might take a while to extinguish too.
--- End quote ---
An EV battery is basically the same, just with much higher energy density.
Psi:
--- Quote from: NiHaoMike on January 10, 2024, 01:24:53 pm ---
--- Quote from: Berni on January 10, 2024, 11:02:57 am ---Another scary thing for arc flash are the giant UPS units that supply entire buildings. Those have a room full of lead acid batteries that will happily produce many thousands of amps at a few 100 volts. Being DC the arc might take a while to extinguish too.
--- End quote ---
An EV battery is basically the same, just with much higher energy density.
--- End quote ---
I think they at least have fuses per cell or per module.
At least cars are Lion or LiFe and not LiPo. The amount of energy you can pull from a shorted LiPo is insane.
tom66:
--- Quote from: NiHaoMike on January 10, 2024, 01:24:53 pm ---
--- Quote from: Berni on January 10, 2024, 11:02:57 am ---Another scary thing for arc flash are the giant UPS units that supply entire buildings. Those have a room full of lead acid batteries that will happily produce many thousands of amps at a few 100 volts. Being DC the arc might take a while to extinguish too.
--- End quote ---
An EV battery is basically the same, just with much higher energy density.
--- End quote ---
Surprisingly the prospective short circuit current of a typical EV battery is less than that a 240V domestic mains supply. It is DC though, which does pose unique risks.
It does surprise me how many precautions are taken around EV systems compared to domestic electricians.
jonpaul:
See IEEE 1584-2018 std.
Great video IEEE 1584-2018 Arc Flash Incident Energy Calculation Method using ETAP
REAL arc flash incident :
Attention! Risque! Bon chance!
Jon
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