Primer on Area Electrical Classification for Research Laboratories

Numerous published and anecdotal accounts exist on flammable liquids and gases igniting in chemical laboratories. This hazard could be mitigated by a better understanding of the principles behind electrical classification, which determines the type of electrical equipment that can be safely used in the presence of flammable materials. Laboratories can successfully apply electrical classification to reduce the risk of fires and explosions, but its proper application requires experience in research operations, the principles and practices of area electrical classification, proper hazard analysis and risk assessment, and some understanding of the methods available for compliance. This article provides a primer for laboratory personnel to assist them in determining if electrical classification of their operations and equipment may be warranted.