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 Post subject: Help me about IEEE1584
PostPosted: Fri Jul 24, 2009 8:31 am 

Joined: Fri Jul 24, 2009 7:37 am
Posts: 5
Location: Turin, Italy
Hi all, my name is Peter Cadili. I'm an italian electrical engineering student. I'm preparing my thesis about arc flash hazard..Please help me for comprise two questions:
1. In the Iarcing formula, comparison in the exponent the Ka parameter equal -0.097 in the box configuration and -0.153 in the air configuration.
Why exist this difference beetwen parameters Ka?
2.The normalized incident energy is calculated at t=o.2 sec and at the distance =610 mm.
why this choices?
Thank you at all for your precious help!
Ah, and excuse me for my bad english!

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