Multymeter.com – The picture above is an example of a simple electrical installation that uses a three-phase electricity network, its use can be adjusted according to needs.
The 40A switch is the last single-phase output to function as a lighting line and a socket. Three-phase electricity network is an AC current (Alternating Current) that uses three phase wires and one Neutral cable which is usually symbolized by the R, S, T line, as the phase cable and the N line as the neutral line. For standard cables, use red, yellow, black, for phase lines and blue for Neutral cables, as well as yellow cables with green strips for ground use.
In general, three-phase electricity has a voltage of 380 volts AC which is usually used for industrial needs and as a driving force for large industrial motors, or housing that uses electrical power above 3500VA.
While single-phase power lines also still use AC (Alternating Current) which is commonly used in housing with power below 3500 VA. Single-phase power lines only use two conducting wires, one phase line (L), and one neutral line conductor. (N), with a voltage of 220 – 240 Volt AC.
Actually the residential electricity network comes from a divided three-phase electricity network, phase R to our house, phase S to neighboring houses and phase T going to other neighbors.
The use of a three-phase network with high excess power so that the current flowing will be lower with the same power.
Thus a short and simple discussion without formulas that are expected to be understood and practiced even for beginners. ***