Cable ampacity – insulation temperature rating vs. equipment terminal ratings

210H

This can be a confusing topic. The issue usually arises in nuclear power plants because most cable is rated at 90 degrees C, but equipment terminals are rated for 60 or 75 degrees C. Getting this wrong leads to costly rework down the line. Continue reading “Cable ampacity – insulation temperature rating vs. equipment terminal ratings”

Some non-electrical concerns to take into account when installing new cables

Installing new cables? There is a standard set of problems you need to be aware of. They aren’t necessarily electrical problems . . . . Continue reading “Some non-electrical concerns to take into account when installing new cables”

Calculating short-circuit currents by hand

You won’t do many short-circuit hand calculations, but it’s useful to go through the exercise to develop an understanding of the fault behavior of typical electrical equipment. There are five you should get to know . . . . Continue reading “Calculating short-circuit currents by hand”

Three fault regions of a time-current plot

In a previous article I discussed the importance of coordination curves. Here I provide some home-made examples. Yep, you got it. Fashioned in the fires of Microsoft Powerpoint . . . . Continue reading “Three fault regions of a time-current plot”