OSHA investigates a hospitalized injury due to an arc flash
A crew from the Los Angeles Department of Water & Power was working upgrading the battery room at a receiving substation. (The room provided emergency power for up to 8 hours.) The electric utility had purchased replacement batteries from RSC in Wilmington, CA.
Before starting work that day, the crew connected the newly purchased batteries in series. Two workers had requested insulated tools as well as appropriate personal protective equipment, such as gloves, barriers, and an insulated torque wrench.