As a result of major changes to the 2011 Code, equipment marking designations for protection may be a prefix or suffix letter to indicate D for dust, G for gas, and M for mining.

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The 2011 Code introduced changes where equipment marking designations for protection include prefix or suffix letters such as D for dust, G for gas, and M for mining to indicate the type of hazardous environment the equipment is designed for.

As a Result of Major Changes to the 2011 Code