To catch a thief means new wireless technology and other mobile computing. Police work is tough. And the officers can be pretty tough on their equipment, especially the delicate computer and video systems that help them in their daily rounds.
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.