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Highlights of NEC Articles 422, 430, and 440

As we continue our journey through Chapter 4 in the 2011 National Electrical Code, I will point out highlights in the material that I...

Grouping of Motors on a Single Branch Circuit

What are the criteria for connecting more than one motor on a single branch circuit overcurrent device? To start to answer this question we need...

Manual Motor Controllers and Self-Protected Combination Motor Controllers Used in ...

Some of the most commonly used, but often misunderstood and misapplied devices in industrial control panels are manual motor controllers and self-protected combination motor...

Speed Control of Motors — An Introduction to Variable-Frequency Drives

Speed, torque, and horsepower are three interrelated parameters in motor control. The speed of a motor measured in revolutions per minute (RPM) defines a...

What is Ladder Logic? Why is it important for troubleshooting motor...

Electric machines are very useful and efficient devices which operate through a variety of control circuits. These control circuits are made up of input devices that...

How Do DC and AC Motors Differ?

Magnetism and its effects are keys to understanding the operation of a motor. Lodestone, a natural mineral, exhibits the characteristics of a bar magnet...

Motor Control Circuits

This article reviews two very essential safety requirements of the Canadian Electrical Code for motor control circuits, grounding and why it’s so significant that...

Motor Supply Conductors

It’s Complicated — you’ve probably seen this witty movie about divorce. Motor wiring rules are complicated too, but not nearly as amusing as the...
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