Circuit breaker withstand ratings and overload conditions
These are two elementary characteristics inherent to any circuit breaker. If you get the trip rating right, but neglect one of these, you’ll be…
Sizing Breakers
Archive
Author: John Livingston
A breaker’s primary function and electromagnetic forces
There’s a crucial link between circuit breakers and electromagnetics. There is good and bad . . . .
Sizing Breakers
Some basic protective-device principles
When you hear “protective device,” think “breakers” and “fuses.” It’s one thing to know how to size them correctly. It’s another thing to know why. But…
Sizing Breakers
Breaker sizing and short-circuits
Breaker sizing is another basic skill required for electrical engineers in the nuclear power industry. Here’s the short of it . . . .
Sizing Breakers
If your voltage-drop calculation fails
What do you do if, after sizing your cable and calculating voltage drop, your voltage drop exceeds what’s allowable?
Sizing cable
The importance of limiting voltage drop
You may not know that the National Electric Code doesn’t make complying with its voltage drop criteria mandatory. But there are still some important…
Sizing cable
Voltage drop
Voltage drop is a basic skill required for every electrical engineer in the nuclear power industry. Here’s a summary of how it’s calculated. There…
Sizing cable
Cable temperatures and physics
It’s helpful to be reminded of the basic physics underlying the basis for the temperature rating of conductors . . . .
Sizing cable