NEMA has new arc flash white paper
By Staff -- Plant Engineering, 8/1/2006
“Arc-Flash Analysis – Utility System Parameters Critical for Accurate PPE” is the title of a recently-released white paper from the Low Voltage Distribution Equipment section of NEMA. The report highlights the need for utility system parameters in the selection of personal protective equipment.
“NFPA 70E, Electrical Standard for Safety in the Workplace,” defines arc flash hazard as: “a dangerous condition associated with the release of energy caused by an electric arc.” It is an explosion involving an electric arc operating at temperatures of several thousands degrees Celsius and a pressure wave created by the arc. Within a few milliseconds, the energy from this explosion can cause severe burns and loss of hearing, eyesight, taste and smell.
Changes to the 2002 National Electrical Code increased the awareness for the necessity to perform arc-flash analysis. In addition to adding requirements for markings to alert qualified persons on the potential of arc-flash hazards, NFPA 70E provides tables for determining the level of PPE. However, these tables apply only to specific parameters and a unique set of conditions. But performing an arc-flash analysis permits the selection of PPE suitable for each location.
The white paper identifies the parameters that the utilities should provide so that an accurate analysis can be conducted. By providing these parameters, and notifying users of system changes, utilities can assist users in ensuring that safe practices consistent with NFPA 70E are maintained.
To view “Arc-Flash Analysis – Utility System Parameters Critical for Accurate PPE,” visit plantengineering.com.
