Electrical distribution systems commonly used in Europe and USA
TN
3-Phase, 4-Wire 400Y/230 V
used in Europe and others
IT
3-Phase, 3-Wire 230 V Wye (No neutral)
used in Norway
Three Phase Three Wire Delta
used to provide power for three-phase motor loads in industry, and utility power distribution systems
voltage typical 240, 400, 480, 600 and higher
277/480V Three Phase Four Wire Wye
used in larger US facilities with voltage 277/480. 277 volt is used as single phase for lighting and 480 volt is used for larger loads like HVAC systems
in western Canada 347/600V is commonly used
120/240V Three Phase Four Wire Delta
used in older manufacturing facilities with mostly three-phase motor loads and some 120 volt single-phase lighting and plug loads
120/240V Single Phase Three Wire
grounded neutral system
known as the Edison system, split-phase or center-tapped neutral
common as residential service in North America
120/208V Three Phase Four Wire Wye
grounded neutral system
the most common commercial building electric service in North America
The Engineering ToolBox (2023). Electrical Distribution Systems. [online] Available at: https://www.engineeringtoolbox.com/electrical-distribution-systems-usa-europe-d_2214.html [Accessed Day Month Year].
