Electrical Distribution Systems
Electrical distribution systems commonly used in Europe and USA
| System Type | Configuration | Voltage | Region/Usage | Description |
|---|---|---|---|---|
| TN | 3-Phase, 4-Wire 400Y/230 V | 230/400V | Europe and others | Standard European distribution system with neutral conductor |
| IT | 3-Phase, 3-Wire 230 V Wye (No neutral) | 230V | Norway | Three-phase system without neutral conductor |
| Three Phase Three Wire Delta | 3-Phase, 3-Wire Delta | 240/400/480/600V+ | Industrial and utility | Used for three-phase motor loads in industry and utility power distribution |
| 277/480V Three Phase Four Wire Wye | 3-Phase, 4-Wire Wye | 277/480V | Larger U.S. facilities (347/600V in western Canada) | 277V for lighting, 480V for larger loads like HVAC systems |
| 120/240V Three Phase Four Wire Delta | 3-Phase, 4-Wire Delta | 120/240V | Older U.S. manufacturing facilities | Designed for mostly three-phase motor loads with some single-phase lighting and plug loads |
| 120/240V Single Phase Three Wire | Single Phase, 3-Wire | 120/240V | North America (residential) | Grounded neutral system, Edison system or split-phase, common residential service |
| 120/208V Three Phase Four Wire Wye | 3-Phase, 4-Wire Wye | 120/208V | North America (commercial) | Grounded neutral system, most common commercial building electric service in North America |