EE_Mark wrote:
mnewman wrote:
In addition to ‘Arc Flash Boundary’ and ‘Incident Energy at Working Distance’ SKM PTW32 Ver 9003 calculates additional arc flash boundaries at user defined incident energies. The PTW attribute is
[email protected]In the attached file, the
[email protected] values at 11) to 14) appear incorrect.
SKM insists the
[email protected] values at 11) to 14) are correct.
My manual calculations for items 1) to 10) and 15) to 18) agree with PTW.
Given that the 'Arc Flash Boundary' is 2524mm, therefore the Incident Energy at 2514mm is 1.2 Cal/cm2. The distance from the arc for 1.2 Cal/cm2 is 2524mm not 609.61mm as shown in 11).
SKM data is wrong in this case. I found a similar result when testing the "AFB @ IE" data blocks. I would avoid using these values from SKM I think they are mixing methods from 2002 and 2018. As you say the results do not make sense. I can confirm with my independent spreadsheet that your results for AFB (1.2cal) = 2524mm and AFB (11.62cal) = 610mm are correct.
The values that you are calculating are correct and are already included in lines 15) to 18).
[email protected] is the data block for that exact function.
[email protected] is a different data block with a different function. If the data for
[email protected] is incorrect as specified, then
[email protected] and
[email protected] would be exactly the same. If you instead look at
[email protected] to mean "Arc Flash Flash Boundary IF the Incident energy is __" 11) -14) is correct and different than
[email protected] As I stated above I do not think that this datablock provides useful information, but I do not think it is wrong in this sense, the values calculated by multiple people in this thread is simply
[email protected]