Power systems today operate in an environment where reliability and safety must be maintained despite rising loads, expanding interconnections, and increasing dependence on distributed energy ...

Members can download this article in PDF format. Power systems employ diodes to perform a variety of functions. For example, diodes can protect against damage due to power-source reverse-polarity ...

Power protection is like insurance: You pay for it, yet hope you don’t need it. But it’s not a simple “purchase.” The first protection question is, “What am I seeking to protect and against what event ...

In the hierarchy of electrical systems, emergency systems (Art. 700) receive priority. Legally required standby systems (Art. 701) take the number two spot, followed by optional standby systems (Art.

Editor's Note: March 16, 2026: We've added a section answering some frequently asked questions related to purchasing a UPS backup at the end of this story, which we hope will help you figure out how ...