The flow of power from the transformer to individual loads occurs in the following sequence: Medium Voltage (MV) Panel to transformer. MV panel with overload/ short-circuit/earth leakage protection of transformer. The symbology (low voltage circuit breaker, low-voltage drawout circuit breaker, medium voltage switch, medium voltage breaker) reflects the most commonly-used equipment for each arrangement. The symbology used throughout this section is shown in Symbology. The radial system is the simplest system. A typical primary distribution substation would include air-insulated outdoor-type high-voltage side (HV) and a metal-enclosed air-insulated indoor-type medium-voltage switchgear (MV). Due to specific reasons, like space limitations, environmental aspects and security, the substation can be built. A low voltage distribution box features robust enclosures, busbars, and protection devices to ensure safe, efficient power distribution in electrical systems. This. Consistent, safe and intelligent low-voltage power distribution and electrical installation technology Whether industries, infrastructures or buildings: Each environment depends on a reliable power supply. Some links are removed, so that each (fused) distributor leaving a substation forms a branched open-ended radial system, as shown in Figure C4 In European countries the standard 3-phase 4-wire. ents), and the electrical equipment, formed by the internal connections and by the incoming and outgoing termina is regard, there has been an evolution which has resulted in the replacement of the previous Standard IEC 60439 with the present Stand rd IEC 61439.