About the electrical inside the need for coefficients

Strong electricity is very helpless: although looking at three, four, five wires is very simple, but then it is very difficult, and is not recognized.

Unlike weak electricity, can be calculated, simulated, and strong electricity many are not or impossible, such as a lot of fault phenomena, if you want to reproduce the scene through the simulation, as is a dream in general.

There are a lot of data in the strong electricity is experience (of course, is also a large number of statistics, calculations), there is no a very strict numerical provisions, the need for coefficient is one of them. If you want to choose the right one, you have to rely on your own study, thinking and a lot of field experience to judge, there is no other way. You can find out by checking some manuals, different power units, the need for coefficients are different.

This is true for many of the calculations in strong electricity: some of the coefficients are chosen by experience.