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Old 01-02-2012, 12:25 PM   #21
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The thing to keep in mind, is that past a certain level of flash energy, even the proper PPE may protect you from burns, but will NOT LEESEN THE CONCUSSION INJURIES FROM THE EXPLOSIVE FORCE AND/ OR SHRAPNEL.

However, you DO want to were the PPE to protect you, as best it can, if you must work hot. It is almost always a better plan to turn off high arc flash potential equipment before working on or in it.

What if it's a 24/7 operation, with too much in the MCC to shut it all down ?

Can the explosion blow open the steel in a closed cabinet ? as in shrap metal, with 480V ?
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Old 01-02-2012, 02:11 PM   #22
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I hate that overused "Safety is No Accident" slogan, should have been retired years ago. It give me the feeling that the safety folks are mindless droids.
awww, man, I love that slogan.
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Old 01-02-2012, 05:18 PM   #23
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...Can the explosion blow open the steel in a closed cabinet ? as in shrap metal, with 480V ?
It can definitely blow open doors and shear off 3/8" bolts to blow panels off. Never seen it actually shred steel, but I still wouldn't want to depend solely on the enclosure to protect me (unless designed for it).

And be careful thinking of arc flash in terms of volts. Some of the most dangerous stuff we have is 480 volts because there's a very long clearing time for the protection, meaning that the victim will be exposed to a lot of energy. A lot of the 13,800 volt stuff actually clears faster meaning it has a lower incident energy.
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...It gives me the feeling that the safety folks are mindless droids.
I get that feeling, too, but I think it comes from too much time working with them....

-John

Last edited by Big John; 01-02-2012 at 05:23 PM.
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Old 01-02-2012, 07:37 PM   #24
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What if it's a 24/7 operation, with too much in the MCC to shut it all down ?

Can the explosion blow open the steel in a closed cabinet ? as in shrap metal, with 480V ?
YES IT CAN, if the fault current is high enough! I have seen it happen before.
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Old 01-02-2012, 07:43 PM   #25
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What if it's a 24/7 operation, with too much in the MCC to shut it all down ?

Can the explosion blow open the steel in a closed cabinet ? as in shrap metal, with 480V ?
As for the "24/7 operation", does you mean that you think that the plant's widget production is more important than your life? What about all of the possible collateral damage to equipment that could have production down for weeks. Would not a short term PLANNED shutdown be better than weeks of unplanned downtime?
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Old 01-02-2012, 08:06 PM   #26
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I hate that overused "Safety is No Accident" slogan, should have been retired years ago. It give me the feeling that the safety folks are mindless droids.
the aultruism of safety was thrown to the dogs when it became big biz with legislated teeth

the more i learn about safety, the more i'm convined we're on our own, or at best looking out for each other

~CS~
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Old 01-02-2012, 11:47 PM   #27
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YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
Good video Joe, looks as though the guy is using a multi-function tester. The procedure we use is a single-function (voltage) tester to prevent the mistake of an incorrect setting. Just wanted to know if the standards are the same in other industries ?
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Old 03-19-2012, 09:02 AM   #28
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Electrical safety is most important. Thanks for sharing this.
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Old 03-28-2012, 10:19 PM   #29
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I hate that overused "Safety is No Accident" slogan, should have been retired years ago. It give me the feeling that the safety folks are mindless droids.
That's cuz most of them are
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