Article 430, Part XI provides the NEC requirements for motors more than 1,000V. Why this special category? Because there are additional hazards due to the higher voltages [430.221]. Part XI does not ...

This is the second half of a two-part article discussing principles and application of the AC induction motors that provide motive power for most of the equipment HVACR engineers specify. In March, we ...

External gear hydraulic motors are devices that convert hydraulic energy into mechanical energy. They achieve this by using externally-mounted gears that rotate when pressurized fluid is introduced, ...

Art. 430, Part III provides the requirements for motor and branch-circuit overload protection. Because of inrush current, overload protection is separate from overcurrent and ground fault protection ...