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betabar
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Post subject: is arc flash catagory reduced?  Posted: Mon Dec 08, 2008 11:39 am |
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Joined: Mon Dec 08, 2008 11:30 am
Posts: 2
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When a mcc bucket is locked out does this affect the flash catagory rating? example a bucket rated a cat 3 is locked out do you still need cat 3 ppe to open the bucket to view the unit?
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Zog
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Post subject: Posted: Mon Dec 08, 2008 1:16 pm |
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Joined: Mon Jun 02, 2008 11:58 am
Posts: 1103
Location: Charlotte, NC
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No it is not, the hazard exists from what is upstream of the MCC so locking it out changes nothing in that cell.
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haze10
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Post subject: Posted: Mon Dec 08, 2008 7:04 pm |
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Joined: Thu Jan 10, 2008 8:49 pm
Posts: 520
Location: New England
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Arc Flash is about working on or near live parts. The only problem with a locked Mcc bucket is that it is only deenergized on the load side of the breaker or fuse switch - the line side is still energized. If the designed incorporated some type of shield or guard that prevented touching live parts then I think you could make a case for it being outside of AF requirements.
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