General > General Technical Chat
Arc blast - is is something for “normal” people to worry about?
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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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