TAB Journal Spring 2015 - (Page 10)

What's all the FUSS about ARC FLASH and Electrical Safety? Justin Garner, P.E., TBE, CxA Engineered Air Balance Co., Inc. There has been a lot of emphasis on electrical safety both within our company and the construction/operations industry in general within the last couple of years. All of this emphasis is attributed to NFPA Standard 70E that was significantly revised in 2012. NFPA 70E is not a law, but rather a standard methodology for compliance with OSHA regulations stating that every employer must protect its employees from electrical hazards. It is not THE standard, but is widely accepted throughout the construction, operations and maintenance industries. It is important to realize that a standard must be black and white, but cannot always cover the gray areas that a worker encounters on a daily basis. Therefore, a thorough understanding of hazards as well as appropriate training is needed to keep every worker safe. Let's begin this discussion with a very simple explanation of electrical hazards that may be present while performing TAB and Commissioning work. Everyone is aware of the shock hazard that is present with electrical equipment, but how aware are you of the arc flash hazard that may be present? While a shock hazard exists from coming into contact with 10 live energized conductors, an arc flash hazard may be present just being in the same room with electrical equipment, whether or not the conductors are exposed. An arc flash is caused by an electrical arcing fault or short between two energized conductors or an energized conductor and neutral or ground. The first component of an arc flash, the available energy in the TAB Journal Spring 2015

Table of Contents for the Digital Edition of TAB Journal Spring 2015

TAB Journal Spring 2015