| 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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