Automation and instrumentation components and systems must often be installed in process plant areas classified as hazardous according to IEC or NEC. These projects present challenges in terms of design, installation and maintenance. For all such installations, there are four main options as shown in the table: explosion-proof, intrinsically safe, non-incendive or purged. Each approach has its advantages and drawbacks, and many installations will be best served by a combination of two or more methods. Perhaps the newest development in hazardous-area installation is more widespread use of the non-incendive or non-sparking approach, which requires AEx nA-rated components.Full Story
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