Note changes to OSHA’s CPR/AED protocol: The Occupational Safety and Health Administration’s (OSHA) requirement for first-aid/CPR responders on-site has not changed; when performing electrical work, it is a recognized fact they are needed.
It goes up. It goes down. Sometimes, it is thought to be infinite (although it isn’t), and other times, it seems impossible to find. The available short-circuit current from the electric utility is one of the more important pieces of information for an arc flash hazard calculation study.