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| is arc flash catagory reduced? https://brainfiller.com/arcflashforum/viewtopic.php?f=7&t=266 |
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| Author: | betabar [ Mon Dec 08, 2008 11:39 am ] |
| Post subject: | is arc flash catagory reduced? |
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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| Author: | Zog [ Mon Dec 08, 2008 1:16 pm ] |
| Post subject: | |
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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| Author: | haze10 [ Mon Dec 08, 2008 7:04 pm ] |
| Post subject: | |
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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