Electrical Distribution Systems
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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
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