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 Post subject: Article in CSE Magazine
PostPosted: Mon Oct 10, 2016 5:18 am 
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Has anyone else seen the article http://www.csemag.com/single-article/pr ... inter%5D=1?

They have two TCCs at the end that are supposed to be before and after changing out breakers, and a resulting reduction in arc flash energy. I just don't see it. Can anyone see what they are supposed to be showing.

Also, the title of the article is "Preventing arc flash in mission critical facilities". They are not preventing anything, only mitigating.

Thanks


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 Post subject: Re: Article in CSE Magazine
PostPosted: Mon Oct 10, 2016 9:25 am 
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dkidd wrote:
Has anyone else seen the article http://www.csemag.com/single-article/pr ... inter%5D=1?

They have two TCCs at the end that are supposed to be before and after changing out breakers, and a resulting reduction in arc flash energy. I just don't see it. Can anyone see what they are supposed to be showing.


The "arcing fault" indication is in the middle of the trip curve so I'd tend to agree...it looks like the intent is there but the curve shown is the wrong TCC for the "mitigated" case".

Quote:
Also, the title of the article is "Preventing arc flash in mission critical facilities". They are not preventing anything, only mitigating.


Based on the point of the article the hazard magnitude is reduced to the point where PPE and/or further efforts are not required. It's not "prevention" as in the top category in ALARP/ALARA in ANSI Z10 but rather the second tier down (reduction). This is vastly different from wearing PPE which is at the bottom of the ALARA/ALARP scale, below even simple things like administrative procedures such as implementing EEWP's.


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 Post subject: Re: Article in CSE Magazine
PostPosted: Tue Oct 11, 2016 5:49 am 
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PaulEngr wrote:
.........

The "arcing fault" indication is in the middle of the trip curve so I'd tend to agree...it looks like the intent is there but the curve shown is the wrong TCC for the "mitigated" case".


Agreed. Looks like the exact same as the "before" curve.


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