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01-02-2012, 11:25 AM
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#21
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Phosphate Coated
Join Date: Apr 2011
Location: California
Posts: 3,939
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Quote:
Originally Posted by varmit
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.
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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 ?
__________________
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01-02-2012, 01:11 PM
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#22
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animal lover /rat bastard
Join Date: Apr 2009
Location: central east coast us
Posts: 7,061
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Quote:
Originally Posted by drsparky
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.
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awww, man, I love that slogan.
__________________
As President Roosevelt said: "We have nothing to fear but fear itself. And Chuck Norris. And 滿口胡言. And Grabthar's hammer. And Gort. and 江南 Style. and rotting in the street and Zombies . . . and Wayne Griffen "
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01-02-2012, 04:18 PM
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#23
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1,000,000th Poster
Join Date: May 2010
Location: Portland
Posts: 9,852
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Quote:
Originally Posted by dronai
...Can the explosion blow open the steel in a closed cabinet ? as in shrap metal, with 480V ?
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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.
Quote:
Originally Posted by drsparky
...It gives me the feeling that the safety folks are mindless droids.
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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 04:23 PM.
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The Following User Says Thank You to Big John For This Useful Post:
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01-02-2012, 06:37 PM
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#24
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Senior Member
Join Date: Apr 2009
Location: Northern Kentucky
Posts: 542
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Quote:
Originally Posted by dronai
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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YES IT CAN, if the fault current is high enough! I have seen it happen before.
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01-02-2012, 06:43 PM
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#25
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Senior Member
Join Date: Apr 2009
Location: Northern Kentucky
Posts: 542
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Quote:
Originally Posted by dronai
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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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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01-02-2012, 07:06 PM
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#26
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Senior Member
Join Date: Mar 2011
Location: Vermont
Posts: 12,171
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Quote:
Originally Posted by drsparky
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.
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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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01-02-2012, 10:47 PM
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#27
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Member
Join Date: Aug 2011
Location: KY
Posts: 38
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Quote:
Originally Posted by Joe Tedesco
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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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03-19-2012, 08:02 AM
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#28
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Junior Member
Join Date: Feb 2012
Location: Australia
Posts: 7
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Electrical safety is most important. Thanks for sharing this.
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03-28-2012, 09:19 PM
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#29
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Senior Member
Join Date: Oct 2011
Location: New Hampshah
Posts: 1,220
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Quote:
Originally Posted by drsparky
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.
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That's cuz most of them are
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