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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => AC Power and Grounding => Topic started by: Mike Sokol on February 06, 2019, 06:42:50 am

Title: Arc Flash in Slo-Mo
Post by: Mike Sokol on February 06, 2019, 06:42:50 am: This is pretty terrifying. An arc flash is basically a bomb that can go off right in front of you, quite literally in your hands. Wear your PPE, people!

https://www.youtube.com/watch?v=5df06xirApQ
Title: Re: Arc Flash in Slo-Mo
Post by: Dave Garoutte on February 06, 2019, 12:33:54 pm: Is the dummy ok? :-[
Title: Re: Arc Flash in Slo-Mo
Post by: John L Nobile on February 06, 2019, 02:50:56 pm: Quote from: Dave Garoutte on February 06, 2019, 12:33:54 pm
Is the dummy ok? :-[

I'm fine. Thanks for asking! :)
Title: Re: Arc Flash in Slo-Mo
Post by: Dave Garoutte on February 06, 2019, 03:14:59 pm: That was you!!??

I'd be curious to see that flash in real time too.
Sometimes slo-mo down-plays the violence of the event.
Title: Re: Arc Flash in Slo-Mo
Post by: Tim McCulloch on February 06, 2019, 03:56:34 pm: Quote from: Dave Garoutte on February 06, 2019, 03:14:59 pm
That was you!!??

I'd be curious to see that flash in real time too.
Sometimes slo-mo down-plays the violence of the event.

Initial visual flash to smoking ruins is probably on the order of <5 seconds.

What's not shown is this video is the force of the blast wave; the dummy must have been well anchored.
Title: Re: Arc Flash in Slo-Mo
Post by: Dave Garoutte on February 07, 2019, 07:03:05 pm: Quote from: Tim McCulloch on February 06, 2019, 03:56:34 pm
Initial visual flash to smoking ruins is probably on the order of <5 seconds.

What's not shown is this video is the force of the blast wave; the dummy must have been well anchored.

I was wondering about that, as it seemed that the dummy should have been blown backwards.
No, not you John.
Title: Re: Arc Flash in Slo-Mo
Post by: Stephen Swaffer on February 08, 2019, 12:51:52 pm: Pretty sure this is the same company/test lab-has some full speed and some slow.

https://www.youtube.com/watch?v=IrpMOzJqszE

The original video is a relatively mild arc flash-the manequin appears to be dressed for a Cat 2 or maybe 3 event. Guess I'm not surprised it wasn't blown back-a person would have reacted and bailed out most likely-though that is not always a good idea when dealing with energized conductors!