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Lightning and BIL
Lightning strikes on power systems are common. A storm is overhead and lightning attempts to find the easiest pathway to ground. This...
Jul 13, 20224 min read


Motor Starting and Inrush
General - Motors are magnetic devices. They rely on the interaction between magnetic fields to create rotation. Before this rotation...
Jul 7, 20223 min read


Medium Voltage Design Example
Determining the ampacity of conductors is never easy. There are a lot of factors to consider, including derating and overcurrent...
May 31, 20222 min read


Feeders and Branch Circuits (NEC 210 and 215)
At the highest level, we could break electrical circuits into 2 categories: branch circuits and feeder circuits. Branch circuits describe...
May 31, 20222 min read


Electrical Engineers vs. Electricians
What's the difference between an electrical engineer and an electrician? I can't tell you how many times I've heard that question. It's...
May 26, 20222 min read


Shock Hazards (Dalziel's Formula)
Electricity is dangerous-plain and simple. The world has become electrified and electricity has almost universally improved the standard...
May 26, 20223 min read


The Arrhenius Equation and Cable Lifespans
The Problem - Consider this hypothetical example: an XHHW-2 circuit is designed for operation at 90°C. The engineer or designer believes...
May 26, 20223 min read


Transients
What are Transients? - Transients describe the behavior of a circuit before it reaches a steady-state condition. This means that some new...
May 26, 20224 min read


Working Space (NEC 110)
Designing and building a good electrical power system is about more than just making sure that all of the studies turn out okay. A common...
May 26, 20222 min read


Engineering Ethics
Introduction - If you take a college ethics class, chances are you'll be learning about philosophers and the abstract ideas. My purpose...
May 26, 20223 min read


Arc Flash Hazards (NFPA 70E)
Basics - The danger most people associate with electrical systems is shock: You touch a wire and a metal frame and experience a jolt of...
May 24, 20224 min read


Transformer Zero Sequence Impedance
Transformers are commonly specified and ordered based on a few key parameters, including the primary and secondary voltages, the apparent...
May 13, 20223 min read


Heat Transfer
Basics - Heat transfer isn't what comes to most people's mind when they hear "electrical engineering", but for power systems engineers...
May 12, 20224 min read


Constant S and Constant Z Loads
Electrical power systems engineers, especially those working on systems at the distribution level, are generally required to complete...
May 12, 20222 min read


Energy Storage Systems (NEC 706)
Battery energy storage systems (BESS) have long been held as a vital part of the shift to renewable energy. Renewables like wind and...
May 12, 20222 min read


Critical and Creative Thinking in Engineering
Too many times have I heard an engineer (or student) tell me, "I like engineering because things are black and white. You can always find...
May 12, 20223 min read


Working with Other Engineering Disciplines
In the real world, electrical engineers don't work in isolation. For better or worse, there are always overlaps of engineering...
May 11, 20222 min read


Capacitors (NEC 460)
General - Capacitors are commonly used as standalone devices in industrial, transmission, and distribution power systems to compensate...
May 6, 20222 min read


Relays, Ladder Logic, and Control
Ladder logic is the dominant representation of controls in power systems. Learn more about ladder logic, relaying, and boolean algebra here
May 4, 20224 min read


Margin-Designing for the Real World
"Electrical engineers design to standards". This was a phrase one of my college professors shared with me in a professional practice...
May 2, 20222 min read
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