A new edition is being proposed for ac contactors with rated voltages of 1501 to 7200 V, and metal-enclosed contactor-based controllers, control centers, and other control assemblies and associated equipment with rated voltages of 751 to 7200 V, designed for operation at frequencies of 50 or 60 Hz on three-phase systems. The proposed standard covers equipment intended for use in ordinary (non-hazardous) locations and installed in accordance with the applicable local installation codes and standards.
ANSI/UL 347-2009 history
2009ANSI/UL 347-2009 Standard for Medium-Voltage AC Contactors, Controllers, and Control Centres