In September 2017, ISA 12.12.01 was updated to UL 121201, 9th Edition. This update brings several changes that will simplify the certification process for Class I, II, and III Division 2 devices.
The most significant revisions are regarding the acceptance of US/CAN Zone 2 and Zone 22 certifications, the international warning symbol (the triangle symbol with an exclamation point), and sealed deviceswhich will give manufacturers greater flexibility in achieving Division 2 certification. This change will allow devices conforming to the ISA/UL 60079 or CSA 60079 series of standards to be acceptable without additional evaluation to UL 121201.
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