Abstract: At 3:30 p.m. on August 27, 2019, Employee #1, a foreman, and Employee #2, his helper, employed by an electrical contractor, were installing an additional series of circuits and a breaker panel at a plastics factory. The employer had agreed to do the installation while the factory was operating and electrical power was not shut off. Employee #1 was using a hand held, battery powered hand drill to remove panels on the live 480-volt electrical cabinet when an arc flash occurred. Neither employee was using hazard controls or wearing PPE. Employee #1 required hospitalization for burns to his face and right hand and temporary blindness. Employee #1 sustained minor injuries plus possible vision problems but was not hospitalized.