Electric supply in the US is usually 120 or 230 for most residential applications. Most household plugs are designed for 120 volts.
However, in commercial and industrial applications, voltages can be in excess of 1000kV. Most equipment supplied by DisperseTech will operate at one of several common voltages 208, 240, 480 and 600 volts.
Classification of Electrical Services
Alternating current (AC) electric power distribution systems can be classified by the following properties:
- Frequency: 50 Hz or 60 Hz
- Number of phases: single or three phase
- Number of wires: 2, 3, or 4 (not counting the safety ground)
- Neutral present:
- Wye connected systems have a neutral
- Delta connected systems typically do not have a neutral
- Voltage classes: (ANSI C84.1-2016)
- Low Voltage: 1000 volts or less
- Medium Voltage: greater than 1000 volts and less than 100 kV
- High Voltage: greater than 100 kV and equal to or less than 230 kV
- Extra-High Voltage: greater than 230 kV but less than 1000 kV
- Ultra-High Voltage: equal to or greater than 1000 kV
|Wye Line-to-Neutral Voltage||Wye or Delta Line-to-Line Voltage|
- Line-to-line voltages in three phase systems are typically 1.732 times the phase-to-neutral voltages: √3 = 1.732
- In symmetrical three-phase electrical system, the phase-to-neutral voltages should be equal if the load is balanced.
- Note: 1201 Refers to a three phase four wire delta service.
Common Electrical Services & Loads
In the following drawings, the coil symbols represent the secondary winding of a utility service transformer or other step down transformer. Electrical code regulations in most jurisdictions require that the neutral conductor be bonded (connected) to the earth safety ground at the electrical service entrance.