In this episode of “EC&M Tech Talks,” Randy Barnett, a journeyman electrician, inspector, author, trainer, and electrical safety expert, clears up some of the confusion regarding barriers, boundaries, and barricades. People often interchange these terms, which can confusion when interpreting the NEC and other NFPA standards.
Article 100 Definitions of the NFPA 70E, Standard for Electrical Safety in the Workplace, defines the three separate terms. Barriers are physical obstructions that prevent inadvertent contact. Boundaries are limits set by standards. Barricades are physical obstructions that prevent the entry of persons into areas where they are subject to injury from electrical hazards. The specific boundaries discussed are the limited approach boundary, restricted approach boundary, and arc flash boundary.
Randy takes viewers through examples of each of the three definitions, featuring demonstrations on a disconnect and a panelboard. Requirements are discussed for barriers from the National Electrical Code and NFPA 79, Electrical Standard for Industrial Machinery. Compliance with codes and standards requires a thorough understanding of the applicable terms used. This video not only helps with understanding the terms but it also 21255481provides practical explanations to help with compliance.