IEEE Std 80 Step Potential and Touch Potential Calculation
Potential Hazards Step potential is the voltage difference between the feet of a person near an energized, grounded object. A person on the ground is subjected to the risk of …
Comparison of NEMA 250 Enclosures and IEC 60529 Degrees of Protection (IP Code)
This document “A Brief Comparison of NEMA 250—Enclosures for Electrical Equipment (1000 Volts Maximum) and IEC 60529—Degrees of Protection Provided by Enclosures (IP Code) is a NEMA Standards Publication. In …
Impact of Unbalance Voltage on Induction Motors
This paper written by Jawad Faiz, H.Ebrahimpour, P.Pillay, investigates the negative effect of unbalanced voltage upon the losses and efficiency of a three phase squirrel cage induction motor. The financial …
CAUTION! Do not mix LV and ELV in Multicore Control Cable
Mixing low voltage (LV) and extra-low voltage (ELV) control voltages in a multicore cable is a common mistake committed by inexperienced design engineers. Combining these control voltages may look good …
Implementing Type 2 Coordination to Improve the Performance of the Motor Control Center
This paper presents the criteria in the selection and coordination of motor control centers (MCCs) components to comply with the requirements for motor service continuity in the most of industrial …
Fundamentals of a Motor Thermal Model and its Applications in Motor Protection
This paper discusses the fundamentals of a motor thermal model and its mathematical interpretation and physics for the different stages of motor operation such as overload, locked rotor, too frequent …