A U.S. manufacturer of refractory materials recently averted catastrophe by a slim margin. An arc flash began in a switchgear cabinet near the control room, but a just-installed arc flash relay shut off the power before major damage could occur, saving the plant from expensive downtime and equipment replacement costs. The company operates a plant that makes fiberglass insulating blankets and glass insulating bricks. It is an older facility, and much of its electrical equipment dates to the 1970s. The plant had been having major issues with utility power; there were voltage dips, for which the utility refused to accept responsibility, that caused product quality problems. The refractory company then called on Evans Enterprises to install power quality metering that would detect any anomalies in the incoming power. Evans also did a number of other things around the plant, including installing shunt trips on all the circuit breakers. Prior to bringing Evans in, the refractory company had hired an engineering firm to conduct an arc flash analysis in an effort to reduce the arc flash hazard categories of equipment throughout the plant. While this might seem routine, the analysis had ...