More and more often, variable frequency drives (VFDs) are used for control of fans and compressors in HVACR systems. The benefits are well documented and industry acceptance is such that most electric ...

A Variable Frequency Drive (VFD) regulates the speed of a 3-phase AC electric motor by controlling the frequency and voltage of the power it delivers to the motor. These devices, also known as ...

5th Circuit upholds Texas law requiring minors to obtain parental consent for contraception A three-judge panel in New Orleans ruled that a Texas law requiring minors to obtain parental consent to ...

In a late-night ruling, the U.S. 9th Circuit Court of Appeals paused a court order that would have required President Trump to return control of thousands of California National Guard troops in Los ...

All questions and answers are based on the 2011 NEC. Q. What is the Code rule for motor control circuit overcurrent protection? A. Motor control conductors that aren’t tapped from the branch circuit ...

Motors account for at least half of the energy consumed in the U.S. Selecting the right control method for an application lets the motor run most efficiently while maximizing torque and overall ...

The US Court of Appeals for the Ninth Circuit blocked a lower court’s decision to return the California National Guard to Governor Gavin Newsom’s control late Thursday. A hearing on the temporary stay ...

The Ninth Circuit Court of Appeals granted President Donald Trump a victory late Thursday night regarding National Guard troop deployment in California. The Appeals Court blocked a federal judge’s ...