November 2006

Special Report: Plant Safety and Environment

Select the best protection method for electrical apparatus in hazardous areas

Here are the trade-offs between safety and cost-of-ownership

Stanley, Z., Servomex Group Ltd.

Thankfully, the science of how to operate safely in hazardous areas with potentially explosive atmospheres is now well understood, though knowing how best to comply with the requirements is something that still causes widespread confusion. Particular care has to be taken with electrical apparatus because of its potential for creating sparks and hotspots that could ignite a gas, vapor, mist or dust-laden atmosphere. Regulations in the EEA, gas groups and risk zones. In the European Economic Area (EEA), hazardous gases are classified in EN 50014: 1997 (Electrical apparatus for potentially explosive atmospheres – General requirements), which is a harmonized standard under Directive 94/9/

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