Abstract: At approximately 2:45 p.m. on June 5, 2007, Employee #1, a journeyman electrician, was troubleshooting and performing diagnostics to determine the source of intermittent power failures at a senior living facility in Tarzana, CA. He had isolated the problem to a 480 volt circuit breaker in the electrical room. The circuit breaker is normally enclosed by a panel to protect against accidental contact. Employee #1 had removed his gloves when he noticed the surface as well as the side of the circuit breaker were hot to the touch. He was using a screwdriver to re-install the cover on the panel when it fell onto the exposed energized sections of the panel. This caused an electrical arc from phase-to-phase and produced an electrical flash. Employee #1 sustained serious burns and was transported to Grossman Burn Center, where he was hospitalized for seven days and underwent skin grafts. Employee #1 was working alone at the time of the incident. The employer was cited for a serious, accident-related violation of T8CCR 2320.2(a), for failing to use insulated tools in accordance with ASTM 1505-94.