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UL 347-2009 pdf download - Medium-Voltage AC Contactors , Controllers , and Control Centers. 3 Definitions General terms 3.1 ... •.. . .. 3.1.101 controller and controlgear: A controller consists of a contactor , overload protecti on...

UL 347 2016 pdf download - Medium-Voltage AC Contactors, Controllers, and Control Centers. 2.2 Special service conditions 2.2.1 Altitude Installation at altitudes above 1 000 m up to 3000 m is also recognized in this standard. Variations...