The official Distribution Voltage standard for single phase is 120 and 240V, for 3 phase it is 208, 240, 480 and 600. Basic household voltage in the US is 120V/240V, whereas most IEC countries, including the UK, EU, AUS, and NZ, use a simple 230V single phase and 400-415V. distribution voltages are between 4 and 35 kV. In this article, unless otherwise specified, voltages are given as line-to-line voltages; this follows normal industry practice, but it is sometimes a source of confusion. A voltage class is a. There are two "standards" for voltage in North America depending on which END of the wire you are looking at; "Distribution Voltage" (also called "Service Voltage") and "Utilization Voltage", both set forth in ANSI (American National Standards Institute) Standard number C84. 1, backed up by IEEE. The utilization voltage of equipment can be accomplished with various distribution system voltages. Typical considerations include utility connections, rate tariffs, distances to loads, costs and others. But what exactly is a power distribution box, and why is it so essential in our daily lives? The DB panel board controls the flow of electricity.