Author: John Livingston

Additional conduit design concerns

Calculating conduit-fill tells you how large your conduit should be. Here are some principles that govern the calculations . . . .

Conduit sizing

Installing cables? Then you’ll probably be installing conduit, too. Here’s a five-step procedure for determining the correct conduit size . . . .

Conduit sizing

An explanation of the origin of a generator’s subtransient reactance

The term “subtransient reactance” is denoted by the symbol X’’d and is used to calculate available short-circuit generator fault currents. But where does it come from?…

Short-circuits and faults

In-depth explanation of the short-circuit behaviors of five important types of electrical equipment

I described in a previous article the benefits of learning how to do short-circuit analysis by hand. There are five primary elements that you…

Short-circuits and faults

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…

Short-circuits and faults

Three kinds of protective devices

There are three common types of protective devices you’ll encounter in the nuclear power industry. Here I summarize their functionality . . . .

Short-circuits and faults

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…

Sizing Breakers

Coordination curves

Sometimes you’ll need to use more exact methods for sizing your breakers than the rules given by the NEC . . . .

Sizing Breakers