I am reviewing the LV and MV switchgear and their protection path within our plant. A significant number of critical breakers and enclosures are 20-30 years old and are in need of replacement. In addition to considering the operational advantages of upgrading the gear, I am trying to find information related to Arc Flash hazards and whether older gear has a higher chance of producing an arc flash. I have searched the NFPA 70E for information and cannot find anything related to my question; most of the standards are related to compliance, not analyzing root causes for the flashes themselves. Does anyone know of a reliable source that discusses whether older gear is more susceptible to arc flashes, or if there is no significant risk at all?