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North American terminology relating to the examination, testing and qualification of devices intended to meet codes and standards governing their use in hazardous (classified) locations. Equivalent to the term “certified” used in Europe and other parts of the world. Approval of a given device is gained through submission to a nationally recognized testing laboratory (NRTL). An approved device will be labeled with the mark of the approving NRTL together with information governing it’s use.

Synonyms:

approved, third-party approval
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