Benefits and concerns with NEC® section 501.1 in reference to zone 2 lighting in division 2 areas

Acceptance of International Electrotechnical Commission (IEC) methodology by the National Electric Code (NEC) has given the industry both benefits and concerns. With the American version ("AEx") of the IEC ("Ex") restricted breathing ("nR"), class I, zone 2 rated luminaire, higher wattages are now allowed in areas that were previously inaccessible. In the quest to reduce costs, fewer but higher wattage luminaires is economically a wise choice. Confusion can develop when the "nR" luminaire, which may look exactly like a class I, division 2 luminaire, is installed with class I, division 2 luminaires in a class I, division 2 area. The plant safety personnel are presented with historical maintenance practices, unfamiliar identification, and a lack of education for personnel on the precautions and proper care of this luminaire.