mwjnewman wrote:
I have seen HRC 2A and 2B in PTW arc-flash software but can not find these categories and their corresponding Incident Energies in 2012 edition of NFPA70 Table 130.7(C)(16).
Can anyone comment on RHC 2A and 2B ?
Never seen those either. Is it really a PTW thing or a site-specific choice?
Maybe HRC 2A asks for 8 cal/cm^2 of protection and HRC 2B asks for 12 cal/cm^2 of protection. It is at least plausible.