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Three-phase in an electrical installation: why, how, for whom?

Three-phase in an electrical installation: why, how, for whom?

Most domestic electrical installations are powered by single-phase. But it is possible to still meet electrical installations wired in three-phase. This is often the case in renovation.

If single-phase remains the simplest solution to design electricity, some people want to keep the three-phase. Moreover, if the three-phase is not common among individuals, it is used in professional premises.

It is therefore important to understand the interest and the implications of a design and a three-phase electrical connection.

You've understood, I'll talk about three-phase in this article:

Preamble to the article on the three-phase and theory:


Explanations on the three-phase that will not please everyone:

I know that physics classes have traumatized a lot of people in high school and high school.

In this article, I will not go into detail in the theory part.

I could talk to you about sinusoid, alternating regime, compound electrical voltages or pulsation. But all this would not serve you on the ground.

I may someday discuss these concepts for the purpose of de-branding, but not in this article.

The idea is not to drink theoretical notions that are accessible everywhere on the net but to address them quickly to enter more detail at the practical level in the context of work.

Simplified three-phase theory:

So what about three-phase simply in the theory part?

I will go quickly and surely bounce the purists of the theory:

The three-phase as the name suggests is a system with three elements.
A three-phase system consists of three electric currents.
These three electric currents flow on different wires (3 electric wires).
On each wire circulates a current which is shifted in time with respect to the other electric currents.
Note: It is possible to replace the current term by voltage.

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