UL/CSA Approved Class I Group C & D Class II Groups E,F&G T3B 140 - 250T frame. UL/CSA Approved Class I Group D Class II Groups E,F&G T3B 280T and above. NEMA MG1 Part 31 Inverter Duty. UL certified 5:1 constant torque. CSA certified 10:1 constant torque. Service Factor 1.15 sine wave power. 1.0 service factor VFD power. IP55 degree of protection. NEMA Design B performance. Class F insulation