Arc Flash in the National Electrical Code: Do Articles 240.87 and 240.67 Achieve Their Intent and Goals?

The National Electrical Code (NEC) has included requirement s for arc-flash-related labeling for several code cycles [1]. Increasingly rigorous requirements for specific arc-flash-related protection attempt to reduce any arc-flash hazards to which personnel may be exposed. They may be exposed to arc-flash hazards during planned energized work or accidentally at any time. The risk-control mechanisms added to the NEC in recent times include additional signage requirements and two articles that intend to reduce arc-flash hazard by decreasing clearing time for circuits rated 1,200 A or greater whether protected by circuit breakers or fuses. This article discusses these recent protection requirements and their intent and potential practical effects as well as how to ensure that the protection this language seeks to provide is included in the electrical power distribution system.