Arc Flash Calculations 2

[richanton]

Has anyone done any of these. I am doing one for the first time using SKM Systems software. I am confused by the intent of the printable signs. I would think you would have one category for each piece of equipment such as a switchgear lineup or motor control center. The software however, calculates by bus, giving different values for different feeders. This would mean I would have to put different signs on each switchgear compartment, because each compartment would have a different requirement. This seems like overkill. Has anyone completed an installation in the field? I would be curious as to how you set up your signs.

 

[alehman]

Good point electic. Research in this field is fairly new. I think IEEE 1584 and NFPA 70E are "works in progress" with considerable room for improvement. This is evidenced somewhat by the rapid rate of change these documents are undergoing. They are all we have for now. I wonder how an engineer who uses them as a basis for design or operation would fare in a courtroom. Another example - I think there was a thread that discussed the affects of air pressure waves from arcs, which is not addressed by either standard at this time.

http://www.csemag.com/article/CA602446.html