What voltage is suitable for a distribution box

A distribution box is typically supplied with low-voltage electricity, commonly 230V single-phase or 400–415V three-phase, depending on the application.Primary and Secondary DistributionElectricity from a substation is first delivered at medium voltage, usually ranging from 2 kV to 33 kV, through primary distribution lines to local transformers . These voltages are not directly used by consumers but are stepped down by distribution transformers to low-voltage levels suitable for homes, offices, and small businesses . Common primary distribution voltages include 11 kV, 22 kV, and 33 kV, which are used to carry power efficiently over moderate distances .Voltage at the Distribution BoxThe distribution box, also called a panel or breaker box, receives power from the secondary side of a transformer. Typical voltages supplied to distribution boxes are:Residential single-phase: 230V (line-to-neutral)Commercial or industrial three-phase: 400–415V (line-to-line), which consists of three 230V lines out of phase by 120 degrees In some industrial settings, higher voltages such as 480V three-phase may be supplied to the main distribution box to feed heavy machinery . The distribution box then divides this incoming voltage into branch circuits, each protected by circuit breakers, ensuring safe and reliable delivery to lighting, HVAC, and equipment.SummaryThe voltage supplied to a distribution box depends on the type of consumer and the system design:Homes: 230V single-phaseSmall commercial buildings: 230V single-phase or 400V three-phaseLarge commercial/industrial facilities: 400–480V three-phase This setup ensures efficient power delivery, safety, and compatibility with electrical devices while allowing the distribution box to manage and protect multiple circuits .