The three-phase system has 4 copper conductors, one of which carries the neutral and 3 carry 3 different phases (i.e. 3 lines). It can therefore support high loads, and allows a large number of luminaires to be managed. In addition, it offers greater flexibility in circuit management. Three-phase tracks are in fact designed to offer three independent power supply circuits, and allow up to three separate ignitions.
This allows the lights mounted on the same track to be divided into three groups, each of which can be switched on individually or together, depending on requirements such as the intensity of natural light available in the room. With the three-phase system, it is as if there were three cables with three different plugs, so the user can decide whether to attach or detach one, two or all three. In the adapters, there is a selector that allows the user to choose which of the lines to connect to: L1 (line 1) , L2 (line 2) and L3 (line 3).
A further advantage of three-phase rails is the standardisation of adapter sizes and positions. Unlike single-phase rails, which were often not standardised, with the introduction of three-phase rails manufacturers started to develop a more consistent system. This allows power supplies of different brands to be used on rails of different manufacturers, making it possible to use power supplies of some brands on rails of other brands.
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